Merge branch 'develop' into feature/push-notification

# Conflicts:
#	Mastodon/Coordinator/SceneCoordinator.swift

.github/scripts/build.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+set -eo pipefail
+
+# build with SwiftPM:
+# https://developer.apple.com/documentation/swift_packages/building_swift_packages_or_apps_that_use_them_in_continuous_integration_workflows
+
+xcodebuild -workspace Mastodon.xcworkspace \
+	-scheme Mastodon \
+	-disableAutomaticPackageResolution \
+	-destination "platform=iOS Simulator,name=iPhone SE (2nd generation)" \
+	clean \
+	build | xcpretty

.github/scripts/setup.sh

@@ -0,0 +1,4 @@
+#!/bin/bash
+
+sudo gem install cocoapods-keys
+pod install

.github/workflows/main.yml

@@ -0,0 +1,27 @@
+name: CI
+
+on:
+  push:
+    branches:
+    - master
+    - develop
+    - feature/*
+  pull_request:
+    branches:
+    - develop
+
+# macOS environments: https://github.com/actions/virtual-environments/tree/main/images/macos
+
+jobs:
+  build:
+    name: CI build
+    runs-on: macos-10.15
+    steps:
+      - name: checkout
+        uses: actions/checkout@v2
+      - name: force Xcode 12.2
+        run: sudo xcode-select -switch /Applications/Xcode_12.2.app
+      - name: setup
+        run: exec ./.github/scripts/setup.sh
+      - name: build
+        run: exec ./.github/scripts/build.sh

Localization/app.json

@@ -51,7 +51,9 @@
                 "preview": "Preview",
                 "share": "Share",
                 "share_user": "Share %s",
-                "open_in_safari": "Open in Safari"
+                "open_in_safari": "Open in Safari",
+                "find_people": "Find people to follow",
+                "manually_search": "Manually search instead"
             },
             "status": {
                 "user_reblogged": "%s reblogged",
@@ -231,6 +233,10 @@
                 "Publishing": "Publishing post..."
             }
         },
+        "suggestion_account": {
+            "title": "Find People to Follow",
+            "follow_explain": "When you follow someone, you’ll see their posts in your home feed."
+        },
         "public_timeline": {
             "title": "Public"
         },
@@ -330,7 +336,7 @@
         },
         "favorite": {
             "title": "Your Favorites"
-            },
+        },
         "notification": {
             "title": {
                 "Everything": "Everything",
@@ -342,6 +348,7 @@
                 "reblog": "rebloged your post",
                 "poll": "Your poll has ended",
                 "mention": "mentioned you"
+            },
         },
         "thread": {
             "back_title": "Post",

Mastodon.xcodeproj/project.pbxproj

@@ -74,6 +74,9 @@
 		2D42FF8F25C8228A004A627A /* UIButton.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2D42FF8E25C8228A004A627A /* UIButton.swift */; };
 		2D45E5BF25C9549700A6D639 /* PublicTimelineViewModel+State.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2D45E5BE25C9549700A6D639 /* PublicTimelineViewModel+State.swift */; };
 		2D46975E25C2A54100CF4AA9 /* NSLayoutConstraint.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2D46975D25C2A54100CF4AA9 /* NSLayoutConstraint.swift */; };
+		2D4AD89C263165B500613EFC /* SuggestionAccountCollectionViewCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2D4AD89B263165B500613EFC /* SuggestionAccountCollectionViewCell.swift */; };
+		2D4AD8A226316CD200613EFC /* SelectedAccountSection.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2D4AD8A126316CD200613EFC /* SelectedAccountSection.swift */; };
+		2D4AD8A826316D3500613EFC /* SelectedAccountItem.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2D4AD8A726316D3500613EFC /* SelectedAccountItem.swift */; };
 		2D571B2F26004EC000540450 /* NavigationBarProgressView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2D571B2E26004EC000540450 /* NavigationBarProgressView.swift */; };
 		2D59819B25E4A581000FB903 /* MastodonConfirmEmailViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2D59819A25E4A581000FB903 /* MastodonConfirmEmailViewController.swift */; };
 		2D5981A125E4A593000FB903 /* MastodonConfirmEmailViewModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2D5981A025E4A593000FB903 /* MastodonConfirmEmailViewModel.swift */; };
@@ -120,6 +123,9 @@
 		2DA7D04425CA52B200804E11 /* TimelineLoaderTableViewCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2DA7D04325CA52B200804E11 /* TimelineLoaderTableViewCell.swift */; };
 		2DA7D04A25CA52CB00804E11 /* TimelineBottomLoaderTableViewCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2DA7D04925CA52CB00804E11 /* TimelineBottomLoaderTableViewCell.swift */; };
 		2DA7D05725CA693F00804E11 /* Application.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2DA7D05625CA693F00804E11 /* Application.swift */; };
+		2DAC9E38262FC2320062E1A6 /* SuggestionAccountViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2DAC9E37262FC2320062E1A6 /* SuggestionAccountViewController.swift */; };
+		2DAC9E3E262FC2400062E1A6 /* SuggestionAccountViewModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2DAC9E3D262FC2400062E1A6 /* SuggestionAccountViewModel.swift */; };
+		2DAC9E46262FC9FD0062E1A6 /* SuggestionAccountTableViewCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2DAC9E45262FC9FD0062E1A6 /* SuggestionAccountTableViewCell.swift */; };
 		2DB72C8C262D764300CE6173 /* Mastodon+Entity+Notification+Type.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2DB72C8B262D764300CE6173 /* Mastodon+Entity+Notification+Type.swift */; };
 		2DCB73FD2615C13900EC03D4 /* SearchRecommendCollectionHeader.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2DCB73FC2615C13900EC03D4 /* SearchRecommendCollectionHeader.swift */; };
 		2DE0FAC12615F04D00CDF649 /* RecommendHashTagSection.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2DE0FAC02615F04D00CDF649 /* RecommendHashTagSection.swift */; };
@@ -531,6 +537,9 @@
 		2D42FF8E25C8228A004A627A /* UIButton.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UIButton.swift; sourceTree = "<group>"; };
 		2D45E5BE25C9549700A6D639 /* PublicTimelineViewModel+State.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "PublicTimelineViewModel+State.swift"; sourceTree = "<group>"; };
 		2D46975D25C2A54100CF4AA9 /* NSLayoutConstraint.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NSLayoutConstraint.swift; sourceTree = "<group>"; };
+		2D4AD89B263165B500613EFC /* SuggestionAccountCollectionViewCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SuggestionAccountCollectionViewCell.swift; sourceTree = "<group>"; };
+		2D4AD8A126316CD200613EFC /* SelectedAccountSection.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SelectedAccountSection.swift; sourceTree = "<group>"; };
+		2D4AD8A726316D3500613EFC /* SelectedAccountItem.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SelectedAccountItem.swift; sourceTree = "<group>"; };
 		2D571B2E26004EC000540450 /* NavigationBarProgressView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NavigationBarProgressView.swift; sourceTree = "<group>"; };
 		2D59819A25E4A581000FB903 /* MastodonConfirmEmailViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MastodonConfirmEmailViewController.swift; sourceTree = "<group>"; };
 		2D5981A025E4A593000FB903 /* MastodonConfirmEmailViewModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MastodonConfirmEmailViewModel.swift; sourceTree = "<group>"; };
@@ -575,6 +584,9 @@
 		2DA7D04925CA52CB00804E11 /* TimelineBottomLoaderTableViewCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TimelineBottomLoaderTableViewCell.swift; sourceTree = "<group>"; };
 		2DA7D05025CA545E00804E11 /* LoadMoreConfigurableTableViewContainer.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LoadMoreConfigurableTableViewContainer.swift; sourceTree = "<group>"; };
 		2DA7D05625CA693F00804E11 /* Application.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Application.swift; sourceTree = "<group>"; };
+		2DAC9E37262FC2320062E1A6 /* SuggestionAccountViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SuggestionAccountViewController.swift; sourceTree = "<group>"; };
+		2DAC9E3D262FC2400062E1A6 /* SuggestionAccountViewModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SuggestionAccountViewModel.swift; sourceTree = "<group>"; };
+		2DAC9E45262FC9FD0062E1A6 /* SuggestionAccountTableViewCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SuggestionAccountTableViewCell.swift; sourceTree = "<group>"; };
 		2DB72C8B262D764300CE6173 /* Mastodon+Entity+Notification+Type.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "Mastodon+Entity+Notification+Type.swift"; sourceTree = "<group>"; };
 		2DCB73FC2615C13900EC03D4 /* SearchRecommendCollectionHeader.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SearchRecommendCollectionHeader.swift; sourceTree = "<group>"; };
 		2DE0FAC02615F04D00CDF649 /* RecommendHashTagSection.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RecommendHashTagSection.swift; sourceTree = "<group>"; };
@@ -1098,6 +1110,14 @@
 			path = Button;
 			sourceTree = "<group>";
 		};
+		2D4AD89A2631659400613EFC /* CollectionViewCell */ = {
+			isa = PBXGroup;
+			children = (
+				2D4AD89B263165B500613EFC /* SuggestionAccountCollectionViewCell.swift */,
+			);
+			path = CollectionViewCell;
+			sourceTree = "<group>";
+		};
 		2D59819925E4A55C000FB903 /* ConfirmEmail */ = {
 			isa = PBXGroup;
 			children = (
@@ -1198,6 +1218,7 @@
 				DB1E346725F518E20079D7DF /* CategoryPickerSection.swift */,
 				2DE0FAC02615F04D00CDF649 /* RecommendHashTagSection.swift */,
 				2DE0FACD2615F7AD00CDF649 /* RecommendAccountSection.swift */,
+				2D4AD8A126316CD200613EFC /* SelectedAccountSection.swift */,
 				2D35237926256D920031AF25 /* NotificationSection.swift */,
 				2D198648261C0B8500F0B013 /* SearchResultSection.swift */,
 				DB66729525F9F91600D60309 /* ComposeStatusSection.swift */,
@@ -1253,6 +1274,7 @@
 			children = (
 				2D7631B225C159F700929FB9 /* Item.swift */,
 				2D198642261BF09500F0B013 /* SearchResultItem.swift */,
+				2D4AD8A726316D3500613EFC /* SelectedAccountItem.swift */,
 				2D7867182625B77500211898 /* NotificationItem.swift */,
 				DB4481CB25EE2AFE00BEFB67 /* PollItem.swift */,
 				DB1E347725F519300079D7DF /* PickServerItem.swift */,
@@ -1272,6 +1294,25 @@
 			path = Decoration;
 			sourceTree = "<group>";
 		};
+		2DAC9E36262FC20B0062E1A6 /* SuggestionAccount */ = {
+			isa = PBXGroup;
+			children = (
+				2DAC9E37262FC2320062E1A6 /* SuggestionAccountViewController.swift */,
+				2DAC9E3D262FC2400062E1A6 /* SuggestionAccountViewModel.swift */,
+				2D4AD89A2631659400613EFC /* CollectionViewCell */,
+				2DAC9E43262FC9DE0062E1A6 /* TableViewCell */,
+			);
+			path = SuggestionAccount;
+			sourceTree = "<group>";
+		};
+		2DAC9E43262FC9DE0062E1A6 /* TableViewCell */ = {
+			isa = PBXGroup;
+			children = (
+				2DAC9E45262FC9FD0062E1A6 /* SuggestionAccountTableViewCell.swift */,
+			);
+			path = TableViewCell;
+			sourceTree = "<group>";
+		};
 		2DE0FAC62615F5D200CDF649 /* View */ = {
 			isa = PBXGroup;
 			children = (
@@ -1779,6 +1820,7 @@
 				2D38F1D325CD463600561493 /* HomeTimeline */,
 				2D76316325C14BAC00929FB9 /* PublicTimeline */,
 				0F2021F5261325ED000C64BF /* HashtagTimeline */,
+				2DAC9E36262FC20B0062E1A6 /* SuggestionAccount */,
 				DB9D6BEE25E4F5370051B173 /* Search */,
 				5B90C455262599800002E742 /* Settings */,
 				DB9D6BFD25E4F57B0051B173 /* Notification */,
@@ -2567,6 +2609,7 @@
 				DBCBED1726132DB500B49291 /* UserTimelineViewModel+Diffable.swift in Sources */,
 				DB71FD4C25F8C80E00512AE1 /* StatusPrefetchingService.swift in Sources */,
 				2DE0FACE2615F7AD00CDF649 /* RecommendAccountSection.swift in Sources */,
+				2DAC9E3E262FC2400062E1A6 /* SuggestionAccountViewModel.swift in Sources */,
 				DB49A62B25FF36C700B98345 /* APIService+CustomEmoji.swift in Sources */,
 				DBCBED1D26132E1A00B49291 /* StatusFetchedResultsController.swift in Sources */,
 				2D79E701261EA5550011E398 /* APIService+CoreData+Tag.swift in Sources */,
@@ -2583,6 +2626,7 @@
 				DB6B351E2601FAEE00DC1E11 /* ComposeStatusAttachmentCollectionViewCell.swift in Sources */,
 				2DA7D04425CA52B200804E11 /* TimelineLoaderTableViewCell.swift in Sources */,
 				DB87D44B2609C11900D12C0D /* PollOptionView.swift in Sources */,
+				2D4AD8A826316D3500613EFC /* SelectedAccountItem.swift in Sources */,
 				DBE3CDFB261C6CA500430CC6 /* FavoriteViewModel.swift in Sources */,
 				DB8AF52F25C13561002E6C99 /* DocumentStore.swift in Sources */,
 				2D206B7225F5D27F00143C56 /* AudioContainerView.swift in Sources */,
@@ -2608,6 +2652,7 @@
 				DB6D1B44263691CF00ACB481 /* Mastodon+API+Subscriptions+Policy.swift in Sources */,
 				DB9A48962603685D008B817C /* MastodonAttachmentService+UploadState.swift in Sources */,
 				2D198643261BF09500F0B013 /* SearchResultItem.swift in Sources */,
+				2DAC9E38262FC2320062E1A6 /* SuggestionAccountViewController.swift in Sources */,
 				DB66728C25F9F8DC00D60309 /* ComposeViewModel+Diffable.swift in Sources */,
 				DBE0822425CD3F1E00FD6BBD /* MastodonRegisterViewModel.swift in Sources */,
 				2DF75B9B25D0E27500694EC8 /* StatusProviderFacade.swift in Sources */,
@@ -2690,6 +2735,7 @@
 				2D364F7825E66D8300204FDC /* MastodonResendEmailViewModel.swift in Sources */,
 				DB8AF54525C13647002E6C99 /* NeedsDependency.swift in Sources */,
 				DB9D6BF825E4F5690051B173 /* NotificationViewController.swift in Sources */,
+				2DAC9E46262FC9FD0062E1A6 /* SuggestionAccountTableViewCell.swift in Sources */,
 				DB45FADD25CA6F6B005A8AC7 /* APIService+CoreData+MastodonUser.swift in Sources */,
 				2D32EABA25CB9B0500C9ED86 /* UIView.swift in Sources */,
 				2D38F20825CD491300561493 /* DisposeBagCollectable.swift in Sources */,
@@ -2714,6 +2760,7 @@
 				DBAE3FA92617106E004B8251 /* MastodonMetricFormatter.swift in Sources */,
 				2D35237A26256D920031AF25 /* NotificationSection.swift in Sources */,
 				DB084B5725CBC56C00F898ED /* Status.swift in Sources */,
+				2D4AD89C263165B500613EFC /* SuggestionAccountCollectionViewCell.swift in Sources */,
 				DB447691260B406600B66B82 /* CustomEmojiPickerItemCollectionViewCell.swift in Sources */,
 				DB9282B225F3222800823B15 /* PickServerEmptyStateView.swift in Sources */,
 				DB0140A825C40C1500F9F3CF /* MastodonPinBasedAuthenticationViewModelNavigationDelegateShim.swift in Sources */,
@@ -2784,6 +2831,7 @@
 				DBB525412611ED54002F1F29 /* ProfileHeaderViewController.swift in Sources */,
 				DB9D6BFF25E4F5940051B173 /* ProfileViewController.swift in Sources */,
 				0FB3D30825E524C600AAD544 /* PickServerCategoriesCell.swift in Sources */,
+				2D4AD8A226316CD200613EFC /* SelectedAccountSection.swift in Sources */,
 				DB789A1225F9F2CC0071ACA0 /* ComposeViewModel.swift in Sources */,
 				DBB525362611ECEB002F1F29 /* UserTimelineViewController.swift in Sources */,
 				DB6D1B3D2636857500ACB481 /* AppearancePreference.swift in Sources */,

Mastodon/Coordinator/SceneCoordinator.swift

@@ -13,6 +13,7 @@ final public class SceneCoordinator {
     private weak var scene: UIScene!
     private weak var sceneDelegate: SceneDelegate!
     private weak var appContext: AppContext!
+    private weak var tabBarController: MainTabBarController!
     
     let id = UUID().uuidString
     
@@ -63,6 +64,9 @@ extension SceneCoordinator {
         
         // setting
         case settings(viewModel: SettingsViewModel)
+
+        // suggestion account
+        case suggestionAccount(viewModel: SuggestionAccountViewModel)
         
         // misc
         case safari(url: URL)
@@ -95,6 +99,7 @@ extension SceneCoordinator {
     func setup() {
         let viewController = MainTabBarController(context: appContext, coordinator: self)
         sceneDelegate.window?.rootViewController = viewController
+        tabBarController = viewController
     }
     
     func setupOnboardingIfNeeds(animated: Bool) {
@@ -189,6 +194,9 @@ extension SceneCoordinator {
         return viewController
     }
 
+    func switchToTabBar(tab: MainTabBarController.Tab) {
+        tabBarController.selectedIndex = tab.rawValue
+    }
 }
 
 private extension SceneCoordinator {
@@ -252,6 +260,10 @@ private extension SceneCoordinator {
             let _viewController = SettingsViewController()
             _viewController.viewModel = viewModel
             viewController = _viewController
+        case .suggestionAccount(let viewModel):
+            let _viewController = SuggestionAccountViewController()
+            _viewController.viewModel = viewModel
+            viewController = _viewController
         case .safari(let url):
             guard let scheme = url.scheme?.lowercased(),
                   scheme == "http" || scheme == "https" else {

Mastodon/Diffiable/Item/SelectedAccountItem.swift

@@ -0,0 +1,38 @@
+//
+//  SelectedAccountItem.swift
+//  Mastodon
+//
+//  Created by sxiaojian on 2021/4/22.
+//
+
+import CoreData
+import Foundation
+
+enum SelectedAccountItem {
+    case accountObjectID(accountObjectID: NSManagedObjectID)
+    case placeHolder(uuid: UUID)
+}
+
+extension SelectedAccountItem: Equatable {
+    static func == (lhs: SelectedAccountItem, rhs: SelectedAccountItem) -> Bool {
+        switch (lhs, rhs) {
+        case (.accountObjectID(let idLeft), .accountObjectID(let idRight)):
+            return idLeft == idRight
+        case (.placeHolder(let uuidLeft), .placeHolder(let uuidRight)):
+            return uuidLeft == uuidRight
+        default:
+            return false
+        }
+    }
+}
+
+extension SelectedAccountItem: Hashable {
+    func hash(into hasher: inout Hasher) {
+        switch self {
+        case .accountObjectID(let id):
+            hasher.combine(id)
+        case .placeHolder(let id):
+            hasher.combine(id.uuidString)
+        }
+    }
+}

Mastodon/Diffiable/Section/RecommendAccountSection.swift

@@ -29,4 +29,21 @@ extension RecommendAccountSection {
             return cell
         }
     }
+    
+    static func tableViewDiffableDataSource(
+        for tableView: UITableView,
+        managedObjectContext: NSManagedObjectContext,
+        viewModel: SuggestionAccountViewModel,
+        delegate: SuggestionAccountTableViewCellDelegate
+    ) -> UITableViewDiffableDataSource<RecommendAccountSection, NSManagedObjectID> {
+        UITableViewDiffableDataSource(tableView: tableView) { [weak viewModel, weak delegate] (tableView, indexPath, objectID) -> UITableViewCell? in
+            guard let viewModel = viewModel else { return nil }
+            let cell = tableView.dequeueReusableCell(withIdentifier: String(describing: SuggestionAccountTableViewCell.self)) as! SuggestionAccountTableViewCell
+            let user = managedObjectContext.object(with: objectID) as! MastodonUser
+            let isSelected = viewModel.selectedAccounts.value.contains(objectID)
+            cell.delegate = delegate
+            cell.config(with: user, isSelected: isSelected)
+            return cell
+        }
+    }
 }

Mastodon/Diffiable/Section/SelectedAccountSection.swift

@@ -0,0 +1,35 @@
+//
+//  SelectedAccountSection.swift
+//  Mastodon
+//
+//  Created by sxiaojian on 2021/4/22.
+//
+
+import CoreData
+import CoreDataStack
+import Foundation
+import MastodonSDK
+import UIKit
+
+enum SelectedAccountSection: Equatable, Hashable {
+    case main
+}
+
+extension SelectedAccountSection {
+    static func collectionViewDiffableDataSource(
+        for collectionView: UICollectionView,
+        managedObjectContext: NSManagedObjectContext
+    ) -> UICollectionViewDiffableDataSource<SelectedAccountSection, SelectedAccountItem> {
+        UICollectionViewDiffableDataSource(collectionView: collectionView) { collectionView, indexPath, item -> UICollectionViewCell? in
+            let cell = collectionView.dequeueReusableCell(withReuseIdentifier: String(describing: SuggestionAccountCollectionViewCell.self), for: indexPath) as! SuggestionAccountCollectionViewCell
+            switch item {
+            case .accountObjectID(let objectID):
+                let user = managedObjectContext.object(with: objectID) as! MastodonUser
+                cell.config(with: user)
+            case .placeHolder:
+                cell.configAsPlaceHolder()
+            }
+            return cell
+        }
+    }
+}

Mastodon/Generated/Assets.swift

@@ -69,6 +69,7 @@ internal enum Asset {
       internal static let highlight = ColorAsset(name: "Colors/Label/highlight")
       internal static let primary = ColorAsset(name: "Colors/Label/primary")
       internal static let secondary = ColorAsset(name: "Colors/Label/secondary")
+      internal static let tertiary = ColorAsset(name: "Colors/Label/tertiary")
     }
     internal enum Notification {
       internal static let favourite = ColorAsset(name: "Colors/Notification/favourite")

Mastodon/Generated/Strings.swift

@@ -72,6 +72,10 @@ internal enum L10n {
         internal static let done = L10n.tr("Localizable", "Common.Controls.Actions.Done")
         /// Edit
         internal static let edit = L10n.tr("Localizable", "Common.Controls.Actions.Edit")
+        /// Find people to follow
+        internal static let findPeople = L10n.tr("Localizable", "Common.Controls.Actions.FindPeople")
+        /// Manually search instead
+        internal static let manuallySearch = L10n.tr("Localizable", "Common.Controls.Actions.ManuallySearch")
         /// OK
         internal static let ok = L10n.tr("Localizable", "Common.Controls.Actions.Ok")
         /// Open in Safari
@@ -679,6 +683,12 @@ internal enum L10n {
         }
       }
     }
+    internal enum SuggestionAccount {
+      /// When you follow someone, you’ll see their posts in your home feed.
+      internal static let followExplain = L10n.tr("Localizable", "Scene.SuggestionAccount.FollowExplain")
+      /// Find People to Follow
+      internal static let title = L10n.tr("Localizable", "Scene.SuggestionAccount.Title")
+    }
     internal enum Thread {
       /// Post
       internal static let backTitle = L10n.tr("Localizable", "Scene.Thread.BackTitle")

Mastodon/Protocol/UserProvider/UserProviderFacade.swift

@@ -44,7 +44,8 @@ extension UserProviderFacade {
                 
                 return context.apiService.toggleFollow(
                     for: mastodonUser,
-                    activeMastodonAuthenticationBox: activeMastodonAuthenticationBox
+                    activeMastodonAuthenticationBox: activeMastodonAuthenticationBox,
+                    needFeedback: true
                 )
             }
             .switchToLatest()

Mastodon/Resources/Assets.xcassets/Colors/Label/tertiary.colorset/Contents.json

@@ -0,0 +1,20 @@
+{
+  "colors" : [
+    {
+      "color" : {
+        "color-space" : "srgb",
+        "components" : {
+          "alpha" : "0.300",
+          "blue" : "67",
+          "green" : "60",
+          "red" : "60"
+        }
+      },
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Mastodon/Resources/en.lproj/Localizable.strings

@@ -20,6 +20,8 @@ Please check your internet connection.";
 "Common.Controls.Actions.Discard" = "Discard";
 "Common.Controls.Actions.Done" = "Done";
 "Common.Controls.Actions.Edit" = "Edit";
+"Common.Controls.Actions.FindPeople" = "Find people to follow";
+"Common.Controls.Actions.ManuallySearch" = "Manually search instead";
 "Common.Controls.Actions.Ok" = "OK";
 "Common.Controls.Actions.OpenInSafari" = "Open in Safari";
 "Common.Controls.Actions.Preview" = "Preview";
@@ -221,6 +223,8 @@ any server.";
 "Scene.Settings.Section.Spicyzone.Signout" = "Sign Out";
 "Scene.Settings.Section.Spicyzone.Title" = "The spicy zone";
 "Scene.Settings.Title" = "Settings";
+"Scene.SuggestionAccount.FollowExplain" = "When you follow someone, you’ll see their posts in your home feed.";
+"Scene.SuggestionAccount.Title" = "Find People to Follow";
 "Scene.Thread.BackTitle" = "Post";
 "Scene.Thread.Favorite.Multiple" = "%@ favorites";
 "Scene.Thread.Favorite.Single" = "%@ favorite";
@@ -228,4 +232,4 @@ any server.";
 "Scene.Thread.Reblog.Single" = "%@ reblog";
 "Scene.Thread.Title" = "Post from %@";
 "Scene.Welcome.Slogan" = "Social networking
-back in your hands.";
+back in your hands.";

Mastodon/Scene/HashtagTimeline/HashtagTimelineViewModel.swift

@@ -84,7 +84,7 @@ final class HashtagTimelineViewModel: NSObject {
         guard let activeMastodonAuthenticationBox = context.authenticationService.activeMastodonAuthenticationBox.value else {
             return
         }
-        let query = Mastodon.API.Search.Query(q: hashtag, type: .hashtags)
+        let query = Mastodon.API.V2.Search.Query(q: hashtag, type: .hashtags)
         context.apiService.search(domain: activeMastodonAuthenticationBox.domain, query: query, mastodonAuthenticationBox: activeMastodonAuthenticationBox)
             .sink { _ in
                 

Mastodon/Scene/HomeTimeline/HomeTimelineViewController+DebugAction.swift

@@ -25,6 +25,14 @@ extension HomeTimelineViewController {
                     guard let self = self else { return }
                     self.showWelcomeAction(action)
                 },
+                UIAction(title: "Show Or Remove EmptyView", image: UIImage(systemName: "clear"), attributes: []) { [weak self] action in
+                    guard let self = self else { return }
+                    if self.emptyView.superview != nil {
+                        self.emptyView.removeFromSuperview()
+                    } else {
+                        self.showEmptyView()
+                    }
+                },
                 UIAction(title: "Show Public Timeline", image: UIImage(systemName: "list.dash"), attributes: []) { [weak self] action in
                     guard let self = self else { return }
                     self.showPublicTimelineAction(action)

Mastodon/Scene/HomeTimeline/HomeTimelineViewController.swift

@@ -23,6 +23,15 @@ final class HomeTimelineViewController: UIViewController, NeedsDependency {
     var disposeBag = Set<AnyCancellable>()
     private(set) lazy var viewModel = HomeTimelineViewModel(context: context)
     
+    lazy var emptyView: UIStackView = {
+        let emptyView = UIStackView()
+        emptyView.axis = .vertical
+        emptyView.distribution = .fill
+        emptyView.layoutMargins = UIEdgeInsets(top: 0, left: 20, bottom: 54, right: 20)
+        emptyView.isLayoutMarginsRelativeArrangement = true
+        return emptyView
+    }()
+    
     let titleView = HomeTimelineNavigationBarTitleView()
     
     let settingBarButtonItem: UIBarButtonItem = {
@@ -136,7 +145,7 @@ extension HomeTimelineViewController {
                     UIView.animate(withDuration: 0.5) { [weak self] in
                         guard let self = self else { return }
                         self.refreshControl.endRefreshing()
-                    }
+                    } completion: { _ in }
                 }
             }
             .store(in: &disposeBag)
@@ -167,6 +176,17 @@ extension HomeTimelineViewController {
                 self.publishProgressView.setProgress(progress, animated: true)
             }
             .store(in: &disposeBag)
+        
+        viewModel.timelineIsEmpty
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] isEmpty in
+                if isEmpty {
+                    self?.showEmptyView()
+                } else {
+                    self?.emptyView.removeFromSuperview()
+                }
+            }
+            .store(in: &disposeBag)
     }
     
     override func viewWillAppear(_ animated: Bool) {
@@ -176,6 +196,10 @@ extension HomeTimelineViewController {
         
         // needs trigger manually after onboarding dismiss
         setNeedsStatusBarAppearanceUpdate()
+        
+        if (viewModel.fetchedResultsController.fetchedObjects ?? []).isEmpty {
+            viewModel.loadLatestStateMachine.enter(HomeTimelineViewModel.LoadLatestState.Loading.self)
+        }
     }
 
     override func viewDidAppear(_ animated: Bool) {
@@ -211,6 +235,58 @@ extension HomeTimelineViewController {
 }
 
 extension HomeTimelineViewController {
+    func showEmptyView() {
+        if emptyView.superview != nil {
+            return
+        }
+        view.addSubview(emptyView)
+        emptyView.translatesAutoresizingMaskIntoConstraints = false
+        NSLayoutConstraint.activate([
+            emptyView.leadingAnchor.constraint(equalTo: view.readableContentGuide.leadingAnchor),
+            emptyView.trailingAnchor.constraint(equalTo: view.readableContentGuide.trailingAnchor),
+            emptyView.bottomAnchor.constraint(equalTo: view.readableContentGuide.bottomAnchor)
+        ])
+        
+        if emptyView.arrangedSubviews.count > 0 {
+            return
+        }
+        let findPeopleButton: PrimaryActionButton = {
+            let button = PrimaryActionButton()
+            button.setTitle(L10n.Common.Controls.Actions.findPeople, for: .normal)
+            button.addTarget(self, action: #selector(HomeTimelineViewController.findPeopleButtonPressed(_:)), for: .touchUpInside)
+            return button
+        }()
+        NSLayoutConstraint.activate([
+            findPeopleButton.heightAnchor.constraint(equalToConstant: 46)
+        ])
+        
+        let manuallySearchButton: HighlightDimmableButton = {
+            let button = HighlightDimmableButton()
+            button.titleLabel?.font = UIFontMetrics(forTextStyle: .headline).scaledFont(for: .systemFont(ofSize: 15, weight: .semibold))
+            button.setTitle(L10n.Common.Controls.Actions.manuallySearch, for: .normal)
+            button.setTitleColor(Asset.Colors.brandBlue.color, for: .normal)
+            button.addTarget(self, action: #selector(HomeTimelineViewController.manuallySearchButtonPressed(_:)), for: .touchUpInside)
+            return button
+        }()
+        
+        emptyView.addArrangedSubview(findPeopleButton)
+        emptyView.setCustomSpacing(17, after: findPeopleButton)
+        emptyView.addArrangedSubview(manuallySearchButton)
+        
+    }
+}
+
+extension HomeTimelineViewController {
+    
+    @objc private func findPeopleButtonPressed(_ sender: PrimaryActionButton) {
+        let viewModel = SuggestionAccountViewModel(context: context)
+        viewModel.delegate = self.viewModel
+        coordinator.present(scene: .suggestionAccount(viewModel: viewModel), from: self, transition: .modal(animated: true, completion: nil))
+    }
+    
+    @objc private func manuallySearchButtonPressed(_ sender: UIButton) {
+        coordinator.switchToTabBar(tab: .search)
+    }
     
     @objc private func settingBarButtonItemPressed(_ sender: UIBarButtonItem) {
         os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s", ((#file as NSString).lastPathComponent), #line, #function)

Mastodon/Scene/HomeTimeline/HomeTimelineViewModel+LoadLatestState.swift

@@ -107,6 +107,7 @@ extension HomeTimelineViewModel.LoadLatestState {
                                 viewModel.homeTimelineNavigationBarTitleViewModel.newPostsIncoming()
                             }
                         }
+                        viewModel.timelineIsEmpty.value = latestStatusIDs.isEmpty && statuses.isEmpty
                     }
                     .store(in: &viewModel.disposeBag)
             }

Mastodon/Scene/HomeTimeline/HomeTimelineViewModel.swift

@@ -34,6 +34,8 @@ final class HomeTimelineViewModel: NSObject {
     weak var tableView: UITableView?
     weak var timelineMiddleLoaderTableViewCellDelegate: TimelineMiddleLoaderTableViewCellDelegate?
     
+    let timelineIsEmpty = CurrentValueSubject<Bool, Never>(false)
+    let homeTimelineNeedRefresh = PassthroughSubject<Void, Never>()
     // output
     // top loader
     private(set) lazy var loadLatestStateMachine: GKStateMachine = {
@@ -122,6 +124,12 @@ final class HomeTimelineViewModel: NSObject {
             }
             .store(in: &disposeBag)
         
+        homeTimelineNeedRefresh
+            .sink { [weak self] _ in
+                self?.loadLatestStateMachine.enter(LoadLatestState.Loading.self)
+            }
+            .store(in: &disposeBag)
+        
     }
     
     deinit {
@@ -129,3 +137,5 @@ final class HomeTimelineViewModel: NSObject {
     }
     
 }
+
+extension HomeTimelineViewModel: SuggestionAccountViewModelDelegate { }

Mastodon/Scene/Profile/Header/View/ProfileRelationshipActionButton.swift

@@ -9,7 +9,7 @@ import UIKit
 
 final class ProfileRelationshipActionButton: RoundedEdgesButton {
     
-    let actvityIndicatorView: UIActivityIndicatorView = {
+    let activityIndicatorView: UIActivityIndicatorView = {
         let activityIndicatorView = UIActivityIndicatorView(style: .medium)
         activityIndicatorView.color = .white
         return activityIndicatorView
@@ -31,15 +31,15 @@ extension ProfileRelationshipActionButton {
     private func _init() {
         titleLabel?.font = .systemFont(ofSize: 17, weight: .semibold)
         
-        actvityIndicatorView.translatesAutoresizingMaskIntoConstraints = false
+        activityIndicatorView.translatesAutoresizingMaskIntoConstraints = false
-        addSubview(actvityIndicatorView)
+        addSubview(activityIndicatorView)
         NSLayoutConstraint.activate([
-            actvityIndicatorView.centerXAnchor.constraint(equalTo: centerXAnchor),
+            activityIndicatorView.centerXAnchor.constraint(equalTo: centerXAnchor),
-            actvityIndicatorView.centerYAnchor.constraint(equalTo: centerYAnchor),
+            activityIndicatorView.centerYAnchor.constraint(equalTo: centerYAnchor),
         ])
         
-        actvityIndicatorView.hidesWhenStopped = true
+        activityIndicatorView.hidesWhenStopped = true
-        actvityIndicatorView.stopAnimating()
+        activityIndicatorView.stopAnimating()
     }
 }
 
@@ -52,13 +52,13 @@ extension ProfileRelationshipActionButton {
         setBackgroundImage(.placeholder(color: actionOptionSet.backgroundColor.withAlphaComponent(0.5)), for: .highlighted)
         setBackgroundImage(.placeholder(color: actionOptionSet.backgroundColor.withAlphaComponent(0.5)), for: .disabled)
         
-        actvityIndicatorView.stopAnimating()
+        activityIndicatorView.stopAnimating()
         
         if let option = actionOptionSet.highPriorityAction(except: .editOptions), option == .blocked || option == .suspended {
             isEnabled = false
         } else if actionOptionSet.contains(.updating) {
             isEnabled = false
-            actvityIndicatorView.startAnimating()
+            activityIndicatorView.startAnimating()
         } else {
             isEnabled = true
         }

Mastodon/Scene/Search/CollectionViewCell/SearchRecommendAccountsCollectionViewCell.swift

@@ -98,10 +98,7 @@ extension SearchRecommendAccountsCollectionViewCell {
         headerImageView.layer.borderColor = Asset.Colors.Border.searchCard.color.cgColor
         applyShadow(color: Asset.Colors.Shadow.searchCard.color, alpha: 0.1, x: 0, y: 3, blur: 12, spread: 0)
     }
-    override open func layoutSubviews() {
+
-        super.layoutSubviews()
-        followButton.layer.cornerRadius = followButton.frame.height/2
-    }
     private func configure() {
         headerImageView.backgroundColor = Asset.Colors.brandBlue.color
         layer.cornerRadius = 10

Mastodon/Scene/Search/CollectionViewCell/SearchRecommendTagsCollectionViewCell.swift

@@ -83,7 +83,6 @@ extension SearchRecommendTagsCollectionViewCell {
         let containerStackView = UIStackView()
         containerStackView.axis = .vertical
         containerStackView.distribution = .fill
-        containerStackView.spacing = 6
         containerStackView.layoutMargins = UIEdgeInsets(top: 16, left: 16, bottom: 0, right: 16)
         containerStackView.isLayoutMarginsRelativeArrangement = true
         containerStackView.translatesAutoresizingMaskIntoConstraints = false
@@ -113,6 +112,7 @@ extension SearchRecommendTagsCollectionViewCell {
         peopleLabel.translatesAutoresizingMaskIntoConstraints = false
         peopleLabel.setContentHuggingPriority(.defaultLow - 1, for: .vertical)
         containerStackView.addArrangedSubview(peopleLabel)
+        containerStackView.setCustomSpacing(SearchViewController.hashtagPeopleTalkingLabelTop, after: horizontalStackView)
     }
     
     func config(with tag: Mastodon.Entity.Tag) {

Mastodon/Scene/Search/SearchViewController+Recommend.swift

@@ -26,7 +26,7 @@ extension SearchViewController {
         hashtagCollectionView.translatesAutoresizingMaskIntoConstraints = false
         stackView.addArrangedSubview(hashtagCollectionView)
         NSLayoutConstraint.activate([
-            hashtagCollectionView.frameLayoutGuide.heightAnchor.constraint(equalToConstant: 130)
+            hashtagCollectionView.frameLayoutGuide.heightAnchor.constraint(equalToConstant: CGFloat(SearchViewController.hashtagCardHeight))
         ])
     }
 
@@ -43,7 +43,7 @@ extension SearchViewController {
         accountsCollectionView.translatesAutoresizingMaskIntoConstraints = false
         stackView.addArrangedSubview(accountsCollectionView)
         NSLayoutConstraint.activate([
-            accountsCollectionView.frameLayoutGuide.heightAnchor.constraint(equalToConstant: 202)
+            accountsCollectionView.frameLayoutGuide.heightAnchor.constraint(equalToConstant: CGFloat(SearchViewController.accountCardHeight))
         ])
     }
 
@@ -91,9 +91,9 @@ extension SearchViewController: UICollectionViewDelegateFlowLayout {
 
     func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
         if collectionView == hashtagCollectionView {
-            return CGSize(width: 228, height: 130)
+            return CGSize(width: 228, height: SearchViewController.hashtagCardHeight)
         } else {
-            return CGSize(width: 257, height: 202)
+            return CGSize(width: 257, height: SearchViewController.accountCardHeight)
         }
     }
 }
@@ -101,5 +101,11 @@ extension SearchViewController: UICollectionViewDelegateFlowLayout {
 extension SearchViewController {
     @objc func hashtagSeeAllButtonPressed(_ sender: UIButton) {}
 
-    @objc func accountSeeAllButtonPressed(_ sender: UIButton) {}
+    @objc func accountSeeAllButtonPressed(_ sender: UIButton) {
+        if self.viewModel.recommendAccounts.isEmpty {
+            return
+        }
+        let viewModel = SuggestionAccountViewModel(context: context, accounts: self.viewModel.recommendAccounts)
+        coordinator.present(scene: .suggestionAccount(viewModel: viewModel), from: self, transition: .modal(animated: true, completion: nil))
+    }
 }

Mastodon/Scene/Search/SearchViewController.swift

@@ -11,6 +11,26 @@ import MastodonSDK
 import UIKit
 
 final class SearchViewController: UIViewController, NeedsDependency {
+    
+    public static var hashtagCardHeight: CGFloat {
+        get {
+            if UIScreen.main.bounds.size.height > 736 {
+                return 186
+            }
+            return 130
+        }
+    }
+    
+    public static var hashtagPeopleTalkingLabelTop: CGFloat {
+        get {
+            if UIScreen.main.bounds.size.height > 736 {
+                return 18
+            }
+            return 6
+        }
+    }
+    public static let accountCardHeight = 202
+    
     weak var context: AppContext! { willSet { precondition(!isViewLoaded) } }
     weak var coordinator: SceneCoordinator! { willSet { precondition(!isViewLoaded) } }
     
@@ -49,9 +69,6 @@ final class SearchViewController: UIViewController, NeedsDependency {
         let stackView = UIStackView()
         stackView.axis = .vertical
         stackView.distribution = .fill
-        stackView.spacing = 0
-        stackView.layoutMargins = UIEdgeInsets(top: 0, left: 0, bottom: 68, right: 0)
-        stackView.isLayoutMarginsRelativeArrangement = true
         return stackView
     }()
     
@@ -130,6 +147,8 @@ extension SearchViewController {
         setupSearchingTableView()
         setupDataSource()
         setupSearchHeader()
+        view.bringSubviewToFront(searchBar)
+        view.bringSubviewToFront(statusBar)
     }
 
     func setupSearchBar() {
@@ -148,23 +167,27 @@ extension SearchViewController {
             statusBar.topAnchor.constraint(equalTo: view.topAnchor),
             statusBar.leadingAnchor.constraint(equalTo: view.leadingAnchor),
             statusBar.trailingAnchor.constraint(equalTo: view.trailingAnchor),
-            statusBar.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 3),
+            statusBar.bottomAnchor.constraint(equalTo: view.layoutMarginsGuide.topAnchor, constant: 3),
         ])
     }
 
     func setupScrollView() {
         scrollView.translatesAutoresizingMaskIntoConstraints = false
+        stackView.translatesAutoresizingMaskIntoConstraints = false
+        
+        // scrollView
         view.addSubview(scrollView)
         NSLayoutConstraint.activate([
-            scrollView.frameLayoutGuide.topAnchor.constraint(equalTo: searchBar.bottomAnchor),
+            scrollView.frameLayoutGuide.topAnchor.constraint(equalTo: view.layoutMarginsGuide.topAnchor, constant: searchBar.frame.height),
-            scrollView.frameLayoutGuide.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor),
+            scrollView.frameLayoutGuide.leadingAnchor.constraint(equalTo: view.leadingAnchor),
-            scrollView.frameLayoutGuide.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor),
+            view.trailingAnchor.constraint(equalTo: scrollView.frameLayoutGuide.trailingAnchor),
-            scrollView.frameLayoutGuide.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor),
+            scrollView.frameLayoutGuide.bottomAnchor.constraint(equalTo: view.bottomAnchor),
-            scrollView.contentLayoutGuide.widthAnchor.constraint(equalTo: view.widthAnchor),
+            scrollView.frameLayoutGuide.widthAnchor.constraint(equalTo: scrollView.contentLayoutGuide.widthAnchor),
         ])
-        
+
-        stackView.translatesAutoresizingMaskIntoConstraints = false
+        // stackview
         scrollView.addSubview(stackView)
+        stackView.translatesAutoresizingMaskIntoConstraints = false
         NSLayoutConstraint.activate([
             stackView.topAnchor.constraint(equalTo: scrollView.contentLayoutGuide.topAnchor),
             stackView.leadingAnchor.constraint(equalTo: scrollView.contentLayoutGuide.leadingAnchor),
@@ -217,11 +240,11 @@ extension SearchViewController: UISearchBarDelegate {
     func searchBar(_ searchBar: UISearchBar, selectedScopeButtonIndexDidChange selectedScope: Int) {
         switch selectedScope {
         case 0:
-            viewModel.searchScope.value = Mastodon.API.Search.SearchType.default
+            viewModel.searchScope.value = Mastodon.API.V2.Search.SearchType.default
         case 1:
-            viewModel.searchScope.value = Mastodon.API.Search.SearchType.accounts
+            viewModel.searchScope.value = Mastodon.API.V2.Search.SearchType.accounts
         case 2:
-            viewModel.searchScope.value = Mastodon.API.Search.SearchType.hashtags
+            viewModel.searchScope.value = Mastodon.API.V2.Search.SearchType.hashtags
         default:
             break
         }

Mastodon/Scene/Search/SearchViewModel+LoadOldestState.swift

@@ -53,14 +53,14 @@ extension SearchViewModel.LoadOldestState {
             }
             var offset = 0
             switch viewModel.searchScope.value {
-            case Mastodon.API.Search.SearchType.accounts:
+            case Mastodon.API.V2.Search.SearchType.accounts:
                 offset = oldSearchResult.accounts.count
-            case Mastodon.API.Search.SearchType.hashtags:
+            case Mastodon.API.V2.Search.SearchType.hashtags:
                 offset = oldSearchResult.hashtags.count
             default:
                 return
             }
-            let query = Mastodon.API.Search.Query(q: viewModel.searchText.value,
+            let query = Mastodon.API.V2.Search.Query(q: viewModel.searchText.value,
                                                   type: viewModel.searchScope.value,
                                                   accountID: nil,
                                                   maxID: nil,
@@ -82,7 +82,7 @@ extension SearchViewModel.LoadOldestState {
                     }
                 } receiveValue: { result in
                     switch viewModel.searchScope.value {
-                    case Mastodon.API.Search.SearchType.accounts:
+                    case Mastodon.API.V2.Search.SearchType.accounts:
                         if result.value.accounts.isEmpty {
                             stateMachine.enter(NoMore.self)
                         } else {
@@ -93,7 +93,7 @@ extension SearchViewModel.LoadOldestState {
                             viewModel.searchResult.value = Mastodon.Entity.SearchResult(accounts: newAccounts, statuses: oldSearchResult.statuses, hashtags: oldSearchResult.hashtags)
                             stateMachine.enter(Idle.self)
                         }
-                    case Mastodon.API.Search.SearchType.hashtags:
+                    case Mastodon.API.V2.Search.SearchType.hashtags:
                         if result.value.hashtags.isEmpty {
                             stateMachine.enter(NoMore.self)
                         } else {

Mastodon/Scene/Search/SearchViewModel.swift

@@ -26,7 +26,7 @@ final class SearchViewModel: NSObject {
     
     // output
     let searchText = CurrentValueSubject<String, Never>("")
-    let searchScope = CurrentValueSubject<Mastodon.API.Search.SearchType, Never>(Mastodon.API.Search.SearchType.default)
+    let searchScope = CurrentValueSubject<Mastodon.API.V2.Search.SearchType, Never>(Mastodon.API.V2.Search.SearchType.default)
     
     let isSearching = CurrentValueSubject<Bool, Never>(false)
     
@@ -34,6 +34,7 @@ final class SearchViewModel: NSObject {
     
     var recommendHashTags = [Mastodon.Entity.Tag]()
     var recommendAccounts = [NSManagedObjectID]()
+    var recommendAccountsFallback = PassthroughSubject<Void, Never>()
     
     var hashtagDiffableDataSource: UICollectionViewDiffableDataSource<RecommendHashTagSection, Mastodon.Entity.Tag>?
     var accountDiffableDataSource: UICollectionViewDiffableDataSource<RecommendAccountSection, NSManagedObjectID>?
@@ -86,16 +87,16 @@ final class SearchViewModel: NSObject {
         }
         .flatMap { (text, scope) -> AnyPublisher<Mastodon.Response.Content<Mastodon.Entity.SearchResult>, Error> in
             
-            let query = Mastodon.API.Search.Query(q: text,
+            let query = Mastodon.API.V2.Search.Query(q: text,
-                                                  type: scope,
+                                                     type: scope,
-                                                  accountID: nil,
+                                                     accountID: nil,
-                                                  maxID: nil,
+                                                     maxID: nil,
-                                                  minID: nil,
+                                                     minID: nil,
-                                                  excludeUnreviewed: nil,
+                                                     excludeUnreviewed: nil,
-                                                  resolve: nil,
+                                                     resolve: nil,
-                                                  limit: nil,
+                                                     limit: nil,
-                                                  offset: nil,
+                                                     offset: nil,
-                                                  following: nil)
+                                                     following: nil)
             return context.apiService.search(domain: activeMastodonAuthenticationBox.domain, query: query, mastodonAuthenticationBox: activeMastodonAuthenticationBox)
         }
         .sink { _ in
@@ -130,8 +131,8 @@ final class SearchViewModel: NSObject {
             snapshot.appendSections([.mixed])
             
             searchHistories.forEach { searchHistory in
-                let containsAccount = scope == Mastodon.API.Search.SearchType.accounts || scope == Mastodon.API.Search.SearchType.default
+                let containsAccount = scope == Mastodon.API.V2.Search.SearchType.accounts || scope == Mastodon.API.V2.Search.SearchType.default
-                let containsHashTag = scope == Mastodon.API.Search.SearchType.hashtags || scope == Mastodon.API.Search.SearchType.default
+                let containsHashTag = scope == Mastodon.API.V2.Search.SearchType.hashtags || scope == Mastodon.API.V2.Search.SearchType.default
                 if let mastodonUser = searchHistory.account, containsAccount {
                     let item = SearchResultItem.accountObjectID(accountObjectID: mastodonUser.objectID)
                     snapshot.appendItems([item], toSection: .mixed)
@@ -142,7 +143,6 @@ final class SearchViewModel: NSObject {
                 }
             }
             dataSource.apply(snapshot, animatingDifferences: false, completion: nil)
-            
         }
         .store(in: &disposeBag)
         
@@ -161,21 +161,31 @@ final class SearchViewModel: NSObject {
             }
             .store(in: &disposeBag)
         
-        requestRecommendAccounts()
+        requestRecommendAccountsV2()
-            .receive(on: DispatchQueue.main)
             .sink { [weak self] _ in
                 guard let self = self else { return }
                 if !self.recommendAccounts.isEmpty {
-                    guard let dataSource = self.accountDiffableDataSource else { return }
+                    self.applyDataSource()
-                    var snapshot = NSDiffableDataSourceSnapshot<RecommendAccountSection, NSManagedObjectID>()
-                    snapshot.appendSections([.main])
-                    snapshot.appendItems(self.recommendAccounts, toSection: .main)
-                    dataSource.apply(snapshot, animatingDifferences: false, completion: nil)
                 }
             } receiveValue: { _ in
             }
             .store(in: &disposeBag)
         
+        recommendAccountsFallback
+            .sink { [weak self] _ in
+                guard let self = self else { return }
+                self.requestRecommendAccounts()
+                    .sink { [weak self] _ in
+                        guard let self = self else { return }
+                        if !self.recommendAccounts.isEmpty {
+                            self.applyDataSource()
+                        }
+                    } receiveValue: { _ in
+                    }
+                    .store(in: &self.disposeBag)
+            }
+            .store(in: &disposeBag)
+        
         searchResult
             .receive(on: DispatchQueue.main)
             .sink { [weak self] searchResult in
@@ -186,7 +196,7 @@ final class SearchViewModel: NSObject {
                     snapshot.appendSections([.account])
                     let items = accounts.compactMap { SearchResultItem.account(account: $0) }
                     snapshot.appendItems(items, toSection: .account)
-                    if self.searchScope.value == Mastodon.API.Search.SearchType.accounts, !items.isEmpty {
+                    if self.searchScope.value == Mastodon.API.V2.Search.SearchType.accounts, !items.isEmpty {
                         snapshot.appendItems([.bottomLoader], toSection: .account)
                     }
                 }
@@ -194,7 +204,7 @@ final class SearchViewModel: NSObject {
                     snapshot.appendSections([.hashtag])
                     let items = tags.compactMap { SearchResultItem.hashtag(tag: $0) }
                     snapshot.appendItems(items, toSection: .hashtag)
-                    if self.searchScope.value == Mastodon.API.Search.SearchType.hashtags, !items.isEmpty {
+                    if self.searchScope.value == Mastodon.API.V2.Search.SearchType.hashtags, !items.isEmpty {
                         snapshot.appendItems([.bottomLoader], toSection: .hashtag)
                     }
                 }
@@ -227,13 +237,43 @@ final class SearchViewModel: NSObject {
         }
     }
 
+    func requestRecommendAccountsV2() -> Future<Void, Error> {
+        Future { promise in
+            guard let activeMastodonAuthenticationBox = self.context.authenticationService.activeMastodonAuthenticationBox.value else {
+                promise(.failure(APIService.APIError.implicit(APIService.APIError.ErrorReason.authenticationMissing)))
+                return
+            }
+            self.context.apiService.suggestionAccountV2(domain: activeMastodonAuthenticationBox.domain, query: nil, mastodonAuthenticationBox: activeMastodonAuthenticationBox)
+                .sink { [weak self] completion in
+                    switch completion {
+                    case .failure(let error):
+                        if let apiError = error as? Mastodon.API.Error {
+                            if apiError.httpResponseStatus == .notFound {
+                                self?.recommendAccountsFallback.send()
+                            }
+                        }
+                        os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: recommendAccount request fail: %s", (#file as NSString).lastPathComponent, #line, #function, error.localizedDescription)
+                        promise(.failure(error))
+                    case .finished:
+                        os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: recommendAccount request success", (#file as NSString).lastPathComponent, #line, #function)
+                        promise(.success(()))
+                    }
+                } receiveValue: { [weak self] accounts in
+                    guard let self = self else { return }
+                    let ids = accounts.value.compactMap({$0.account.id})
+                    self.receiveAccounts(ids: ids)
+                }
+                .store(in: &self.disposeBag)
+        }
+    }
+    
     func requestRecommendAccounts() -> Future<Void, Error> {
         Future { promise in
             guard let activeMastodonAuthenticationBox = self.context.authenticationService.activeMastodonAuthenticationBox.value else {
                 promise(.failure(APIService.APIError.implicit(APIService.APIError.ErrorReason.authenticationMissing)))
                 return
             }
-            self.context.apiService.recommendAccount(domain: activeMastodonAuthenticationBox.domain, query: nil, mastodonAuthenticationBox: activeMastodonAuthenticationBox)
+            self.context.apiService.suggestionAccount(domain: activeMastodonAuthenticationBox.domain, query: nil, mastodonAuthenticationBox: activeMastodonAuthenticationBox)
                 .sink { completion in
                     switch completion {
                     case .failure(let error):
@@ -246,27 +286,47 @@ final class SearchViewModel: NSObject {
                 } receiveValue: { [weak self] accounts in
                     guard let self = self else { return }
                     let ids = accounts.value.compactMap({$0.id})
-                    let userFetchRequest = MastodonUser.sortedFetchRequest
+                    self.receiveAccounts(ids: ids)
-                    userFetchRequest.predicate = MastodonUser.predicate(domain: activeMastodonAuthenticationBox.domain, ids: ids)
-                    let mastodonUsers: [MastodonUser]? = {
-                        let userFetchRequest = MastodonUser.sortedFetchRequest
-                        userFetchRequest.predicate = MastodonUser.predicate(domain: activeMastodonAuthenticationBox.domain, ids: ids)
-                        userFetchRequest.returnsObjectsAsFaults = false
-                        do {
-                            return try self.context.managedObjectContext.fetch(userFetchRequest)
-                        } catch {
-                            assertionFailure(error.localizedDescription)
-                            return nil
-                        }
-                    }()
-                    if let users = mastodonUsers {
-                        self.recommendAccounts = users.map(\.objectID)
-                    }
                 }
                 .store(in: &self.disposeBag)
         }
     }
     
+    func applyDataSource() {
+        DispatchQueue.main.async {
+            guard let dataSource = self.accountDiffableDataSource else { return }
+            var snapshot = NSDiffableDataSourceSnapshot<RecommendAccountSection, NSManagedObjectID>()
+            snapshot.appendSections([.main])
+            snapshot.appendItems(self.recommendAccounts, toSection: .main)
+            dataSource.apply(snapshot, animatingDifferences: false, completion: nil)
+        }
+    }
+    
+    func receiveAccounts(ids: [String]) {
+        guard let activeMastodonAuthenticationBox = context.authenticationService.activeMastodonAuthenticationBox.value else {
+            return
+        }
+        let userFetchRequest = MastodonUser.sortedFetchRequest
+        userFetchRequest.predicate = MastodonUser.predicate(domain: activeMastodonAuthenticationBox.domain, ids: ids)
+        let mastodonUsers: [MastodonUser]? = {
+            let userFetchRequest = MastodonUser.sortedFetchRequest
+            userFetchRequest.predicate = MastodonUser.predicate(domain: activeMastodonAuthenticationBox.domain, ids: ids)
+            userFetchRequest.returnsObjectsAsFaults = false
+            do {
+                return try self.context.managedObjectContext.fetch(userFetchRequest)
+            } catch {
+                assertionFailure(error.localizedDescription)
+                return nil
+            }
+        }()
+        if let users = mastodonUsers {
+            let sortedUsers = users.sorted { (user1, user2) -> Bool in
+                (ids.firstIndex(of: user1.id) ?? 0) < (ids.firstIndex(of: user2.id) ?? 0)
+            }
+            recommendAccounts = sortedUsers.map(\.objectID)
+        }
+    }
+
     func accountCollectionViewItemDidSelected(mastodonUser: MastodonUser, from: UIViewController) {
         let viewModel = ProfileViewModel(context: context, optionalMastodonUser: mastodonUser)
         DispatchQueue.main.async {

Mastodon/Scene/SuggestionAccount/CollectionViewCell/SuggestionAccountCollectionViewCell.swift

@@ -0,0 +1,61 @@
+//
+//  SuggestionAccountCollectionViewCell.swift
+//  Mastodon
+//
+//  Created by sxiaojian on 2021/4/22.
+//
+
+import CoreDataStack
+import Foundation
+import UIKit
+
+class SuggestionAccountCollectionViewCell: UICollectionViewCell {
+    let imageView: UIImageView = {
+        let imageView = UIImageView()
+        imageView.tintColor = Asset.Colors.Label.tertiary.color
+        imageView.layer.cornerRadius = 4
+        imageView.clipsToBounds = true
+        imageView.image = UIImage.placeholder(color: .systemFill)
+        return imageView
+    }()
+
+    func configAsPlaceHolder() {
+        imageView.tintColor = Asset.Colors.Label.tertiary.color
+        imageView.image = UIImage.placeholder(color: .systemFill)
+    }
+
+    func config(with mastodonUser: MastodonUser) {
+        imageView.af.setImage(
+            withURL: URL(string: mastodonUser.avatar)!,
+            placeholderImage: UIImage.placeholder(color: .systemFill),
+            imageTransition: .crossDissolve(0.2)
+        )
+    }
+
+    override func prepareForReuse() {
+        super.prepareForReuse()
+    }
+
+    override init(frame: CGRect) {
+        super.init(frame: .zero)
+        configure()
+    }
+
+    required init?(coder: NSCoder) {
+        super.init(coder: coder)
+        configure()
+    }
+}
+
+extension SuggestionAccountCollectionViewCell {
+    private func configure() {
+        contentView.addSubview(imageView)
+        imageView.translatesAutoresizingMaskIntoConstraints = false
+        NSLayoutConstraint.activate([
+            imageView.topAnchor.constraint(equalTo: contentView.topAnchor),
+            imageView.leadingAnchor.constraint(equalTo: contentView.leadingAnchor),
+            imageView.trailingAnchor.constraint(equalTo: contentView.trailingAnchor),
+            imageView.bottomAnchor.constraint(equalTo: contentView.bottomAnchor),
+        ])
+    }
+}

Mastodon/Scene/SuggestionAccount/SuggestionAccountViewController.swift

@@ -0,0 +1,213 @@
+//
+//  SuggestionAccountViewController.swift
+//  Mastodon
+//
+//  Created by sxiaojian on 2021/4/21.
+//
+
+import Combine
+import CoreData
+import CoreDataStack
+import Foundation
+import OSLog
+import UIKit
+
+class SuggestionAccountViewController: UIViewController, NeedsDependency {
+    weak var context: AppContext! { willSet { precondition(!isViewLoaded) } }
+    weak var coordinator: SceneCoordinator! { willSet { precondition(!isViewLoaded) } }
+
+    var disposeBag = Set<AnyCancellable>()
+
+    var viewModel: SuggestionAccountViewModel!
+
+    let tableView: UITableView = {
+        let tableView = ControlContainableTableView()
+        tableView.register(SuggestionAccountTableViewCell.self, forCellReuseIdentifier: String(describing: SuggestionAccountTableViewCell.self))
+        tableView.rowHeight = UITableView.automaticDimension
+        tableView.tableFooterView = UIView()
+        tableView.separatorStyle = .singleLine
+        tableView.separatorInset = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
+        return tableView
+    }()
+
+    lazy var tableHeader: UIView = {
+        let view = UIView()
+        view.backgroundColor = Asset.Colors.Background.systemGroupedBackground.color
+        view.frame = CGRect(origin: .zero, size: CGSize(width: tableView.frame.width, height: 156))
+        return view
+    }()
+
+    let followExplainLabel: UILabel = {
+        let label = UILabel()
+        label.text = L10n.Scene.SuggestionAccount.followExplain
+        label.textColor = Asset.Colors.Label.primary.color
+        label.font = UIFontMetrics(forTextStyle: .body).scaledFont(for: .systemFont(ofSize: 17, weight: .regular))
+        label.numberOfLines = 0
+        return label
+    }()
+
+    let selectedCollectionView: UICollectionView = {
+        let flowLayout = UICollectionViewFlowLayout()
+        flowLayout.scrollDirection = .horizontal
+        let view = ControlContainableCollectionView(frame: .zero, collectionViewLayout: flowLayout)
+        view.register(SuggestionAccountCollectionViewCell.self, forCellWithReuseIdentifier: String(describing: SuggestionAccountCollectionViewCell.self))
+        view.backgroundColor = .clear
+        view.showsHorizontalScrollIndicator = false
+        view.showsVerticalScrollIndicator = false
+        view.layer.masksToBounds = false
+        return view
+    }()
+
+    deinit {
+        os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s:", (#file as NSString).lastPathComponent, #line, #function)
+    }
+}
+
+extension SuggestionAccountViewController {
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        view.backgroundColor = Asset.Colors.Background.systemBackground.color
+        title = L10n.Scene.SuggestionAccount.title
+        navigationItem.rightBarButtonItem
+            = UIBarButtonItem(barButtonSystemItem: UIBarButtonItem.SystemItem.done,
+                              target: self,
+                              action: #selector(SuggestionAccountViewController.doneButtonDidClick(_:)))
+
+        tableView.delegate = self
+        tableView.translatesAutoresizingMaskIntoConstraints = false
+        view.addSubview(tableView)
+        NSLayoutConstraint.activate([
+            tableView.topAnchor.constraint(equalTo: view.topAnchor),
+            tableView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
+            tableView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
+            tableView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
+        ])
+        viewModel.diffableDataSource = RecommendAccountSection.tableViewDiffableDataSource(
+            for: tableView,
+            managedObjectContext: context.managedObjectContext,
+            viewModel: viewModel,
+            delegate: self
+        )
+
+        viewModel.collectionDiffableDataSource = SelectedAccountSection.collectionViewDiffableDataSource(for: selectedCollectionView, managedObjectContext: context.managedObjectContext)
+
+        viewModel.accounts
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] accounts in
+                guard let self = self else { return }
+                self.setupHeader(accounts: accounts)
+            }
+            .store(in: &disposeBag)
+    }
+
+    override func viewWillAppear(_ animated: Bool) {
+        super.viewWillAppear(animated)
+        tableView.deselectRow(with: transitionCoordinator, animated: animated)
+        viewModel.checkAccountsFollowState()
+    }
+
+    override func viewWillLayoutSubviews() {
+        super.viewWillLayoutSubviews()
+        let avatarImageViewHeight: Double = 56
+        let avatarImageViewCount = Int(floor((Double(view.frame.width) - 20) / (avatarImageViewHeight + 15)))
+        viewModel.headerPlaceholderCount.value = avatarImageViewCount
+    }
+
+    func setupHeader(accounts: [NSManagedObjectID]) {
+        if accounts.isEmpty {
+            return
+        }
+        followExplainLabel.translatesAutoresizingMaskIntoConstraints = false
+        tableHeader.addSubview(followExplainLabel)
+        NSLayoutConstraint.activate([
+            followExplainLabel.topAnchor.constraint(equalTo: tableHeader.topAnchor, constant: 20),
+            followExplainLabel.leadingAnchor.constraint(equalTo: tableHeader.leadingAnchor, constant: 20),
+            tableHeader.trailingAnchor.constraint(equalTo: followExplainLabel.trailingAnchor, constant: 20),
+        ])
+
+        selectedCollectionView.translatesAutoresizingMaskIntoConstraints = false
+        tableHeader.addSubview(selectedCollectionView)
+        NSLayoutConstraint.activate([
+            selectedCollectionView.frameLayoutGuide.topAnchor.constraint(equalTo: followExplainLabel.topAnchor, constant: 20),
+            selectedCollectionView.frameLayoutGuide.leadingAnchor.constraint(equalTo: tableHeader.leadingAnchor, constant: 20),
+            selectedCollectionView.frameLayoutGuide.trailingAnchor.constraint(equalTo: tableHeader.trailingAnchor),
+            selectedCollectionView.frameLayoutGuide.bottomAnchor.constraint(equalTo: tableHeader.bottomAnchor),
+        ])
+        selectedCollectionView.delegate = self
+
+        tableView.tableHeaderView = tableHeader
+    }
+}
+
+extension SuggestionAccountViewController: UICollectionViewDelegateFlowLayout {
+    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
+        15
+    }
+
+    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
+        CGSize(width: 56, height: 56)
+    }
+
+    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
+        guard let diffableDataSource = viewModel.collectionDiffableDataSource else { return }
+        guard let item = diffableDataSource.itemIdentifier(for: indexPath) else { return }
+        switch item {
+        case .accountObjectID(let accountObjectID):
+            let mastodonUser = context.managedObjectContext.object(with: accountObjectID) as! MastodonUser
+            let viewModel = ProfileViewModel(context: context, optionalMastodonUser: mastodonUser)
+            DispatchQueue.main.async {
+                self.coordinator.present(scene: .profile(viewModel: viewModel), from: self, transition: .show)
+            }
+        default:
+            break
+        }
+    }
+}
+
+extension SuggestionAccountViewController: UITableViewDelegate {
+    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
+        guard let diffableDataSource = viewModel.diffableDataSource else { return }
+        guard let objectID = diffableDataSource.itemIdentifier(for: indexPath) else { return }
+        let mastodonUser = context.managedObjectContext.object(with: objectID) as! MastodonUser
+        let viewModel = ProfileViewModel(context: context, optionalMastodonUser: mastodonUser)
+        DispatchQueue.main.async {
+            self.coordinator.present(scene: .profile(viewModel: viewModel), from: self, transition: .show)
+        }
+    }
+}
+
+extension SuggestionAccountViewController: SuggestionAccountTableViewCellDelegate {
+    func accountButtonPressed(objectID: NSManagedObjectID, cell: SuggestionAccountTableViewCell) {
+        let selected = !viewModel.selectedAccounts.value.contains(objectID)
+        cell.startAnimating()
+        viewModel.followAction(objectID: objectID)?
+            .sink(receiveCompletion: { [weak self] completion in
+                guard let self = self else { return }
+                cell.stopAnimating()
+                switch completion {
+                case .failure(let error):
+                    os_log("%{public}s[%{public}ld], %{public}s: follow failed. %s", (#file as NSString).lastPathComponent, #line, #function, error.localizedDescription)
+                case .finished:
+                    var selectedAccounts = self.viewModel.selectedAccounts.value
+                    if selected {
+                        selectedAccounts.append(objectID)
+                    } else {
+                        selectedAccounts.removeAll { $0 == objectID }
+                    }
+                    cell.button.isSelected = selected
+                    self.viewModel.selectedAccounts.value = selectedAccounts
+                }
+            }, receiveValue: { _ in
+            })
+            .store(in: &disposeBag)
+    }
+}
+
+extension SuggestionAccountViewController {
+    @objc func doneButtonDidClick(_ sender: UIButton) {
+        dismiss(animated: true, completion: nil)
+        if viewModel.selectedAccounts.value.count > 0 {
+            viewModel.delegate?.homeTimelineNeedRefresh.send()
+        }
+    }
+}

Mastodon/Scene/SuggestionAccount/SuggestionAccountViewModel.swift

@@ -0,0 +1,222 @@
+//
+//  SuggestionAccountViewModel.swift
+//  Mastodon
+//
+//  Created by sxiaojian on 2021/4/21.
+//
+
+import Combine
+import CoreData
+import CoreDataStack
+import GameplayKit
+import MastodonSDK
+import os.log
+import UIKit
+    
+protocol SuggestionAccountViewModelDelegate: AnyObject {
+    var homeTimelineNeedRefresh: PassthroughSubject<Void, Never> { get }
+}
+
+final class SuggestionAccountViewModel: NSObject {
+    var disposeBag = Set<AnyCancellable>()
+    
+    // input
+    let context: AppContext
+    
+    let currentMastodonUser = CurrentValueSubject<MastodonUser?, Never>(nil)
+    weak var delegate: SuggestionAccountViewModelDelegate?
+    // output
+    let accounts = CurrentValueSubject<[NSManagedObjectID], Never>([])
+    var selectedAccounts = CurrentValueSubject<[NSManagedObjectID], Never>([])
+
+    var headerPlaceholderCount = CurrentValueSubject<Int?, Never>(nil)
+    var suggestionAccountsFallback = PassthroughSubject<Void, Never>()
+    
+    var viewWillAppear = PassthroughSubject<Void, Never>()
+    
+    var diffableDataSource: UITableViewDiffableDataSource<RecommendAccountSection, NSManagedObjectID>? {
+        didSet(value) {
+            if !accounts.value.isEmpty {
+                applyTableViewDataSource(accounts: accounts.value)
+            }
+        }
+    }
+    
+    var collectionDiffableDataSource: UICollectionViewDiffableDataSource<SelectedAccountSection, SelectedAccountItem>?
+    
+    init(context: AppContext, accounts: [NSManagedObjectID]? = nil) {
+        self.context = context
+
+        super.init()
+        
+        Publishers.CombineLatest(self.accounts,self.selectedAccounts)
+            .sink { [weak self] accounts,selectedAccounts in
+                self?.applyTableViewDataSource(accounts: accounts)
+                self?.applySelectedCollectionViewDataSource(accounts: selectedAccounts)
+            }
+            .store(in: &disposeBag)
+        
+        Publishers.CombineLatest(self.selectedAccounts,self.headerPlaceholderCount)
+            .sink { [weak self] selectedAccount,count in
+                self?.applySelectedCollectionViewDataSource(accounts: selectedAccount)
+            }
+            .store(in: &disposeBag)
+        
+        viewWillAppear
+            .sink { [weak self] _ in
+                self?.checkAccountsFollowState()
+            }
+            .store(in: &disposeBag)
+        
+        if let accounts = accounts {
+            self.accounts.value = accounts
+        }
+        
+        context.authenticationService.activeMastodonAuthentication
+            .sink { [weak self] activeMastodonAuthentication in
+                guard let self = self else { return }
+                guard let activeMastodonAuthentication = activeMastodonAuthentication else {
+                    self.currentMastodonUser.value = nil
+                    return
+                }
+                self.currentMastodonUser.value = activeMastodonAuthentication.user
+            }
+            .store(in: &disposeBag)
+        
+        if accounts == nil || (accounts ?? []).isEmpty {
+            guard let activeMastodonAuthenticationBox = context.authenticationService.activeMastodonAuthenticationBox.value else { return }
+
+            context.apiService.suggestionAccountV2(domain: activeMastodonAuthenticationBox.domain, query: nil, mastodonAuthenticationBox: activeMastodonAuthenticationBox)
+                .sink { [weak self] completion in
+                    switch completion {
+                    case .failure(let error):
+                        if let apiError = error as? Mastodon.API.Error {
+                            if apiError.httpResponseStatus == .notFound {
+                                self?.suggestionAccountsFallback.send()
+                            }
+                        }
+                        os_log("%{public}s[%{public}ld], %{public}s: fetch recommendAccountV2 failed. %s", (#file as NSString).lastPathComponent, #line, #function, error.localizedDescription)
+                    case .finished:
+                        // handle isFetchingLatestTimeline in fetch controller delegate
+                        break
+                    }
+                } receiveValue: { [weak self] response in
+                    let ids = response.value.map(\.account.id)
+                    self?.receiveAccounts(ids: ids)
+                }
+                .store(in: &disposeBag)
+            
+            suggestionAccountsFallback
+                .sink(receiveValue: { [weak self] _ in
+                    self?.requestSuggestionAccount()
+                })
+                .store(in: &disposeBag)
+        }
+    }
+    
+    func requestSuggestionAccount() {
+        guard let activeMastodonAuthenticationBox = context.authenticationService.activeMastodonAuthenticationBox.value else { return }
+        context.apiService.suggestionAccount(domain: activeMastodonAuthenticationBox.domain, query: nil, mastodonAuthenticationBox: activeMastodonAuthenticationBox)
+            .sink { completion in
+                switch completion {
+                case .failure(let error):
+                    os_log("%{public}s[%{public}ld], %{public}s: fetch recommendAccount failed. %s", (#file as NSString).lastPathComponent, #line, #function, error.localizedDescription)
+                case .finished:
+                    // handle isFetchingLatestTimeline in fetch controller delegate
+                    break
+                }
+            } receiveValue: { [weak self] response in
+                let ids = response.value.map(\.id)
+                self?.receiveAccounts(ids: ids)
+            }
+            .store(in: &disposeBag)
+    }
+    
+    func applyTableViewDataSource(accounts: [NSManagedObjectID]) {
+        guard let dataSource = diffableDataSource else { return }
+        var snapshot = NSDiffableDataSourceSnapshot<RecommendAccountSection, NSManagedObjectID>()
+        snapshot.appendSections([.main])
+        snapshot.appendItems(accounts, toSection: .main)
+        dataSource.apply(snapshot, animatingDifferences: false, completion: nil)
+    }
+    
+    func applySelectedCollectionViewDataSource(accounts: [NSManagedObjectID]) {
+        guard let count = headerPlaceholderCount.value else { return }
+        guard let dataSource = collectionDiffableDataSource else { return }
+        var snapshot = NSDiffableDataSourceSnapshot<SelectedAccountSection, SelectedAccountItem>()
+        snapshot.appendSections([.main])
+        let placeholderCount = count - accounts.count
+        let accountItems = accounts.map { SelectedAccountItem.accountObjectID(accountObjectID: $0) }
+        snapshot.appendItems(accountItems, toSection: .main)
+        
+        if placeholderCount > 0 {
+            for _ in 0 ..< placeholderCount {
+                snapshot.appendItems([SelectedAccountItem.placeHolder(uuid: UUID())], toSection: .main)
+            }
+        }
+        dataSource.apply(snapshot, animatingDifferences: false, completion: nil)
+    }
+
+    func receiveAccounts(ids: [String]) {
+        guard let activeMastodonAuthenticationBox = context.authenticationService.activeMastodonAuthenticationBox.value else {
+            return
+        }
+        let userFetchRequest = MastodonUser.sortedFetchRequest
+        userFetchRequest.predicate = MastodonUser.predicate(domain: activeMastodonAuthenticationBox.domain, ids: ids)
+        let mastodonUsers: [MastodonUser]? = {
+            let userFetchRequest = MastodonUser.sortedFetchRequest
+            userFetchRequest.predicate = MastodonUser.predicate(domain: activeMastodonAuthenticationBox.domain, ids: ids)
+            userFetchRequest.returnsObjectsAsFaults = false
+            do {
+                return try self.context.managedObjectContext.fetch(userFetchRequest)
+            } catch {
+                assertionFailure(error.localizedDescription)
+                return nil
+            }
+        }()
+        if let users = mastodonUsers {
+            let sortedUsers = users.sorted { (user1, user2) -> Bool in
+                (ids.firstIndex(of: user1.id) ?? 0) < (ids.firstIndex(of: user2.id) ?? 0)
+            }
+            accounts.value = sortedUsers.map(\.objectID)
+        }
+    }
+
+    func followAction(objectID: NSManagedObjectID) -> AnyPublisher<Mastodon.Response.Content<Mastodon.Entity.Relationship>, Error>? {
+        guard let activeMastodonAuthenticationBox = context.authenticationService.activeMastodonAuthenticationBox.value else { return nil }
+
+        let mastodonUser = context.managedObjectContext.object(with: objectID) as! MastodonUser
+        return context.apiService.toggleFollow(
+            for: mastodonUser,
+            activeMastodonAuthenticationBox: activeMastodonAuthenticationBox,
+            needFeedback: false
+        )
+    }
+    
+    func checkAccountsFollowState() {
+        guard let currentMastodonUser = currentMastodonUser.value else {
+            return
+        }
+        let users: [MastodonUser] = accounts.value.compactMap {
+            guard let user = context.managedObjectContext.object(with: $0) as? MastodonUser else {
+                return nil
+            }
+            let isBlock = user.blockingBy.flatMap { $0.contains(currentMastodonUser) } ?? false
+            let isDomainBlock = user.domainBlockingBy.flatMap { $0.contains(currentMastodonUser) } ?? false
+            if isBlock || isDomainBlock {
+                return nil
+            } else {
+                return user
+            }
+        }
+        accounts.value = users.map(\.objectID)
+        
+        let followingUsers = users.filter { user -> Bool in
+            let isFollowing = user.followingBy.flatMap { $0.contains(currentMastodonUser) } ?? false
+            let isPending = user.followRequestedBy.flatMap { $0.contains(currentMastodonUser) } ?? false
+            return isFollowing || isPending
+        }.map(\.objectID)
+        
+        selectedAccounts.value = followingUsers
+    }
+}

Mastodon/Scene/SuggestionAccount/TableViewCell/SuggestionAccountTableViewCell.swift

@@ -0,0 +1,191 @@
+//
+//  SuggestionAccountTableViewCell.swift
+//  Mastodon
+//
+//  Created by sxiaojian on 2021/4/21.
+//
+
+import Combine
+import CoreData
+import CoreDataStack
+import Foundation
+import MastodonSDK
+import UIKit
+
+protocol SuggestionAccountTableViewCellDelegate: AnyObject {
+    func accountButtonPressed(objectID: NSManagedObjectID, cell: SuggestionAccountTableViewCell)
+}
+
+final class SuggestionAccountTableViewCell: UITableViewCell {
+    var disposeBag = Set<AnyCancellable>()
+    weak var delegate: SuggestionAccountTableViewCellDelegate?
+    
+    let _imageView: UIImageView = {
+        let imageView = UIImageView()
+        imageView.tintColor = Asset.Colors.Label.primary.color
+        imageView.layer.cornerRadius = 4
+        imageView.clipsToBounds = true
+        return imageView
+    }()
+    
+    let titleLabel: UILabel = {
+        let label = UILabel()
+        label.textColor = Asset.Colors.brandBlue.color
+        label.font = .systemFont(ofSize: 17, weight: .semibold)
+        label.lineBreakMode = .byTruncatingTail
+        return label
+    }()
+    
+    let subTitleLabel: UILabel = {
+        let label = UILabel()
+        label.textColor = Asset.Colors.Label.secondary.color
+        label.font = .preferredFont(forTextStyle: .body)
+        return label
+    }()
+    
+    let buttonContainer: UIView = {
+        let view = UIView()
+        view.backgroundColor = .clear
+        return view
+    }()
+    
+    let button: HighlightDimmableButton = {
+        let button = HighlightDimmableButton(type: .custom)
+        if let plusImage = UIImage(systemName: "plus.circle", withConfiguration: UIImage.SymbolConfiguration(pointSize: 22, weight: .regular))?.withRenderingMode(.alwaysTemplate) {
+            button.setImage(plusImage, for: .normal)
+        }
+        if let minusImage = UIImage(systemName: "minus.circle.fill", withConfiguration: UIImage.SymbolConfiguration(pointSize: 22, weight: .regular))?.withRenderingMode(.alwaysTemplate) {
+            button.setImage(minusImage, for: .selected)
+        }
+        return button
+    }()
+    
+    let activityIndicatorView: UIActivityIndicatorView = {
+        let activityIndicatorView = UIActivityIndicatorView(style: .medium)
+        activityIndicatorView.hidesWhenStopped = true
+        return activityIndicatorView
+    }()
+
+    override func prepareForReuse() {
+        super.prepareForReuse()
+        _imageView.af.cancelImageRequest()
+        _imageView.image = nil
+        disposeBag.removeAll()
+    }
+    
+    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
+        super.init(style: style, reuseIdentifier: reuseIdentifier)
+        configure()
+    }
+    
+    required init?(coder: NSCoder) {
+        super.init(coder: coder)
+        configure()
+    }
+}
+
+extension SuggestionAccountTableViewCell {
+    private func configure() {
+        backgroundColor = .clear
+        
+        let containerStackView = UIStackView()
+        containerStackView.axis = .horizontal
+        containerStackView.distribution = .fill
+        containerStackView.spacing = 12
+        containerStackView.layoutMargins = UIEdgeInsets(top: 12, left: 21, bottom: 12, right: 12)
+        containerStackView.isLayoutMarginsRelativeArrangement = true
+        containerStackView.translatesAutoresizingMaskIntoConstraints = false
+        contentView.addSubview(containerStackView)
+        NSLayoutConstraint.activate([
+            containerStackView.topAnchor.constraint(equalTo: contentView.topAnchor),
+            containerStackView.leadingAnchor.constraint(equalTo: contentView.leadingAnchor),
+            containerStackView.trailingAnchor.constraint(equalTo: contentView.trailingAnchor),
+            containerStackView.bottomAnchor.constraint(equalTo: contentView.bottomAnchor),
+        ])
+        
+        _imageView.translatesAutoresizingMaskIntoConstraints = false
+        containerStackView.addArrangedSubview(_imageView)
+        NSLayoutConstraint.activate([
+            _imageView.widthAnchor.constraint(equalToConstant: 42).priority(.required - 1),
+            _imageView.heightAnchor.constraint(equalToConstant: 42).priority(.required - 1),
+        ])
+        
+        let textStackView = UIStackView()
+        textStackView.axis = .vertical
+        textStackView.distribution = .fill
+        textStackView.alignment = .leading
+        textStackView.translatesAutoresizingMaskIntoConstraints = false
+        titleLabel.translatesAutoresizingMaskIntoConstraints = false
+        textStackView.addArrangedSubview(titleLabel)
+        subTitleLabel.translatesAutoresizingMaskIntoConstraints = false
+        textStackView.addArrangedSubview(subTitleLabel)
+        subTitleLabel.setContentHuggingPriority(.defaultLow - 1, for: .vertical)
+        
+        containerStackView.addArrangedSubview(textStackView)
+        textStackView.setContentHuggingPriority(.defaultLow - 1, for: .horizontal)
+        
+        buttonContainer.translatesAutoresizingMaskIntoConstraints = false
+        containerStackView.addArrangedSubview(buttonContainer)
+        NSLayoutConstraint.activate([
+            buttonContainer.widthAnchor.constraint(equalToConstant: 24).priority(.required - 1),
+            buttonContainer.heightAnchor.constraint(equalToConstant: 42).priority(.required - 1),
+        ])
+        buttonContainer.setContentHuggingPriority(.required - 1, for: .horizontal)
+        
+        activityIndicatorView.translatesAutoresizingMaskIntoConstraints = false
+        button.translatesAutoresizingMaskIntoConstraints = false
+        activityIndicatorView.translatesAutoresizingMaskIntoConstraints = false
+        buttonContainer.addSubview(button)
+        buttonContainer.addSubview(activityIndicatorView)
+        NSLayoutConstraint.activate([
+            buttonContainer.centerXAnchor.constraint(equalTo: activityIndicatorView.centerXAnchor),
+            buttonContainer.centerYAnchor.constraint(equalTo: activityIndicatorView.centerYAnchor),
+            buttonContainer.centerXAnchor.constraint(equalTo: button.centerXAnchor),
+            buttonContainer.centerYAnchor.constraint(equalTo: button.centerYAnchor),
+        ])
+    }
+    
+    func config(with account: MastodonUser, isSelected: Bool) {
+        if let url = account.avatarImageURL() {
+            _imageView.af.setImage(
+                withURL: url,
+                placeholderImage: UIImage.placeholder(color: .systemFill),
+                imageTransition: .crossDissolve(0.2)
+            )
+        }
+        titleLabel.text = account.displayName.isEmpty ? account.username : account.displayName
+        subTitleLabel.text = account.acct
+        button.isSelected = isSelected
+        button.publisher(for: .touchUpInside)
+            .sink { [weak self] _ in
+                guard let self = self else { return }
+                self.delegate?.accountButtonPressed(objectID: account.objectID, cell: self)
+            }
+            .store(in: &disposeBag)
+        button.publisher(for: \.isSelected)
+            .sink { [weak self] isSelected in
+                if isSelected {
+                    self?.button.tintColor = Asset.Colors.danger.color
+                } else {
+                    self?.button.tintColor = Asset.Colors.Label.secondary.color
+                }
+            }
+            .store(in: &disposeBag)
+        activityIndicatorView.publisher(for: \.isHidden)
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] isHidden in
+                self?.button.isHidden = !isHidden
+            }
+            .store(in: &disposeBag)
+    }
+    
+    func startAnimating() {
+        activityIndicatorView.isHidden = false
+        activityIndicatorView.startAnimating()
+    }
+
+    func stopAnimating() {
+        activityIndicatorView.stopAnimating()
+        activityIndicatorView.isHidden = true
+    }
+}

Mastodon/Service/APIService/APIService+Follow.swift

@@ -24,10 +24,15 @@ extension APIService {
     /// - Returns: publisher for `Relationship`
     func toggleFollow(
         for mastodonUser: MastodonUser,
-        activeMastodonAuthenticationBox: AuthenticationService.MastodonAuthenticationBox
+        activeMastodonAuthenticationBox: AuthenticationService.MastodonAuthenticationBox,
+        needFeedback: Bool
     ) -> AnyPublisher<Mastodon.Response.Content<Mastodon.Entity.Relationship>, Error> {
-        let impactFeedbackGenerator = UIImpactFeedbackGenerator(style: .light)
+        var impactFeedbackGenerator: UIImpactFeedbackGenerator?
-        let notificationFeedbackGenerator = UINotificationFeedbackGenerator()
+        var notificationFeedbackGenerator: UINotificationFeedbackGenerator?
+        if needFeedback {
+            impactFeedbackGenerator = UIImpactFeedbackGenerator(style: .light)
+            notificationFeedbackGenerator = UINotificationFeedbackGenerator()
+        }
         
         return followUpdateLocal(
             mastodonUserObjectID: mastodonUser.objectID,
@@ -35,9 +40,9 @@ extension APIService {
         )
         .receive(on: DispatchQueue.main)
         .handleEvents { _ in
-            impactFeedbackGenerator.prepare()
+            impactFeedbackGenerator?.prepare()
         } receiveOutput: { _ in
-            impactFeedbackGenerator.impactOccurred()
+            impactFeedbackGenerator?.impactOccurred()
         } receiveCompletion: { completion in
             switch completion {
             case .failure(let error):
@@ -74,13 +79,13 @@ extension APIService {
                     os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: [Friendship] rollback finish", ((#file as NSString).lastPathComponent), #line, #function)
                 } receiveValue: { _ in
                     // do nothing
-                    notificationFeedbackGenerator.prepare()
+                    notificationFeedbackGenerator?.prepare()
-                    notificationFeedbackGenerator.notificationOccurred(.error)
+                    notificationFeedbackGenerator?.notificationOccurred(.error)
                 }
                 .store(in: &self.disposeBag)
 
             case .finished:
-                notificationFeedbackGenerator.notificationOccurred(.success)
+                notificationFeedbackGenerator?.notificationOccurred(.success)
                 os_log("%{public}s[%{public}ld], %{public}s: [Friendship] remote friendship update success", ((#file as NSString).lastPathComponent), #line, #function)
             }
         })

Mastodon/Service/APIService/APIService+Recommend.swift

@@ -13,7 +13,7 @@ import CoreDataStack
 import OSLog
 
 extension APIService {
-    func recommendAccount(
+    func suggestionAccount(
         domain: String,
         query: Mastodon.API.Suggestions.Query?,
         mastodonAuthenticationBox: AuthenticationService.MastodonAuthenticationBox
@@ -44,6 +44,38 @@ extension APIService {
             .eraseToAnyPublisher()
     }
 
+    func suggestionAccountV2(
+        domain: String,
+        query: Mastodon.API.Suggestions.Query?,
+        mastodonAuthenticationBox: AuthenticationService.MastodonAuthenticationBox
+    ) -> AnyPublisher<Mastodon.Response.Content<[Mastodon.Entity.V2.SuggestionAccount]>, Error> {
+        let authorization = mastodonAuthenticationBox.userAuthorization
+
+        return Mastodon.API.V2.Suggestions.get(session: session, domain: domain, query: query, authorization: authorization)
+            .flatMap { response -> AnyPublisher<Mastodon.Response.Content<[Mastodon.Entity.V2.SuggestionAccount]>, Error> in
+                let log = OSLog.api
+                return self.backgroundManagedObjectContext.performChanges {
+                    response.value.forEach { suggestionAccount in
+                        let user = suggestionAccount.account
+                        let (mastodonUser,isCreated) = APIService.CoreData.createOrMergeMastodonUser(into: self.backgroundManagedObjectContext, for: nil, in: domain, entity: user, userCache: nil, networkDate: Date(), log: log)
+                        let flag = isCreated ? "+" : "-"
+                        os_log(.info, log: log, "%{public}s[%{public}ld], %{public}s: fetch mastodon user [%s](%s)%s", (#file as NSString).lastPathComponent, #line, #function, flag, mastodonUser.id, mastodonUser.username)
+                    }
+                }
+                .setFailureType(to: Error.self)
+                .tryMap { result -> Mastodon.Response.Content<[Mastodon.Entity.V2.SuggestionAccount]> in
+                    switch result {
+                    case .success:
+                        return response
+                    case .failure(let error):
+                        throw error
+                    }
+                }
+                .eraseToAnyPublisher()
+            }
+            .eraseToAnyPublisher()
+    }
+    
     func recommendTrends(
         domain: String,
         query: Mastodon.API.Trends.Query?

Mastodon/Service/APIService/APIService+Search.swift

@@ -13,11 +13,11 @@ extension APIService {
  
     func search(
         domain: String,
-        query: Mastodon.API.Search.Query,
+        query: Mastodon.API.V2.Search.Query,
         mastodonAuthenticationBox: AuthenticationService.MastodonAuthenticationBox
     ) -> AnyPublisher<Mastodon.Response.Content<Mastodon.Entity.SearchResult>, Error> {
         let authorization = mastodonAuthenticationBox.userAuthorization
 
-        return Mastodon.API.Search.search(session: session, domain: domain, query: query, authorization: authorization)
+        return Mastodon.API.V2.Search.search(session: session, domain: domain, query: query, authorization: authorization)
     }
 }

MastodonSDK/Sources/MastodonSDK/API/Mastodon+API+V2+Search.swift

@@ -8,7 +8,7 @@
 import Combine
 import Foundation
 
-extension Mastodon.API.Search {
+extension Mastodon.API.V2.Search {
     static func searchURL(domain: String) -> URL {
         Mastodon.API.endpointV2URL(domain: domain).appendingPathComponent("search")
     }
@@ -32,7 +32,7 @@ extension Mastodon.API.Search {
     public static func search(
         session: URLSession,
         domain: String,
-        query: Mastodon.API.Search.Query,
+        query: Mastodon.API.V2.Search.Query,
         authorization: Mastodon.API.OAuth.Authorization
     ) -> AnyPublisher<Mastodon.Response.Content<Mastodon.Entity.SearchResult>, Error> {
         let request = Mastodon.API.get(
@@ -49,7 +49,7 @@ extension Mastodon.API.Search {
     }
 }
 
-extension Mastodon.API.Search {
+extension Mastodon.API.V2.Search {
     
     public struct Query: Codable, GetQuery {
         public init(q: String,
@@ -105,7 +105,7 @@ extension Mastodon.API.Search {
     }
 }
 
-public extension Mastodon.API.Search {
+public extension Mastodon.API.V2.Search {
     enum SearchType: String, Codable {
         case accounts
         case hashtags

MastodonSDK/Sources/MastodonSDK/API/Mastodon+API+V2+Suggestions.swift

@@ -0,0 +1,41 @@
+//
+//  Mastodon+API+V2+Suggestions.swift
+//  
+//
+//  Created by sxiaojian on 2021/4/20.
+//
+
+import Combine
+import Foundation
+
+extension Mastodon.API.V2.Suggestions {
+    static func suggestionsURL(domain: String) -> URL {
+        Mastodon.API.endpointV2URL(domain: domain).appendingPathComponent("suggestions")
+    }
+
+    /// Follow suggestions, No document for now
+    /// - Parameters:
+    ///   - session: `URLSession`
+    ///   - domain: Mastodon instance domain. e.g. "example.com"
+    ///   - query: query
+    ///   - authorization: User token.
+    /// - Returns: `AnyPublisher` contains `AccountsSuggestion` nested in the response
+    public static func get(
+        session: URLSession,
+        domain: String,
+        query: Mastodon.API.Suggestions.Query?,
+        authorization: Mastodon.API.OAuth.Authorization
+    ) -> AnyPublisher<Mastodon.Response.Content<[Mastodon.Entity.V2.SuggestionAccount]>, Error> {
+        let request = Mastodon.API.get(
+            url: suggestionsURL(domain: domain),
+            query: query,
+            authorization: authorization
+        )
+        return session.dataTaskPublisher(for: request)
+            .tryMap { data, response in
+                let value = try Mastodon.API.decode(type: [Mastodon.Entity.V2.SuggestionAccount].self, from: data, response: response)
+                return Mastodon.Response.Content(value: value, response: response)
+            }
+            .eraseToAnyPublisher()
+    }
+}

MastodonSDK/Sources/MastodonSDK/API/Mastodon+API.swift

@@ -99,6 +99,7 @@ extension Mastodon.API {
 }
 
 extension Mastodon.API {
+    public enum V2 { }
     public enum Account { }
     public enum App { }
     public enum CustomEmojis { }
@@ -111,13 +112,17 @@ extension Mastodon.API {
     public enum Reblog { }
     public enum Statuses { }
     public enum Timeline { }
-    public enum Search { }
     public enum Trends { }
     public enum Suggestions { }
     public enum Notifications { }
     public enum Subscriptions { }
 }
 
+extension Mastodon.API.V2 {
+    public enum Search { }
+    public enum Suggestions { }
+}
+
 extension Mastodon.API {
     
     static func get(

MastodonSDK/Sources/MastodonSDK/Entity/Mastodon+Entity+Suggestion.swift

@@ -0,0 +1,23 @@
+//
+//  Mastodon+Entity+Suggestion.swift
+//  
+//
+//  Created by sxiaojian on 2021/4/20.
+//
+
+import Foundation
+
+extension Mastodon.Entity.V2 {
+
+    public struct SuggestionAccount: Codable {
+
+        public let source: String
+        public let account: Mastodon.Entity.Account
+        
+        
+        enum CodingKeys: String, CodingKey {
+            case source
+            case account
+        }
+    }
+}