Merge pull request #292 from mastodon/feature/multi-account

[WIP] Add multiple account supports
2021-09-15 20:21:01 +08:00 · 2021-09-15 20:21:01 +08:00 · 8dbbbc374a
parent 7a089831cd 016d7b987d
commit 8dbbbc374a
25 changed files with 1177 additions and 51 deletions
--- a/Localization/app.json
+++ b/Localization/app.json
@ -534,6 +534,14 @@
                "show_next": "Show Next",
                "show_previous": "Show Previous"
            }
        },
        "account_list": {
            "tab_bar_hint": "Current selected profile: %s. Double tap then hold to show account switcher",
            "dismiss_account_switcher": "Dismiss Account Switcher",
            "add_account": "Add Account",
        },
        "wizard": {
            "multiple_account_switch_intro_description": "Switch between multiple accounts by holding the profile button."
        }
    }
 }
--- a/Mastodon.xcodeproj/project.pbxproj
+++ b/Mastodon.xcodeproj/project.pbxproj
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@ -4017,12 +4079,14 @@
 				DB938F1526241FDF00E5B6C1 /* APIService+Thread.swift in Sources */,
 				DB482A45261335BA008AE74C /* UserTimelineViewController+Provider.swift in Sources */,
 				2D206B8625F5FB0900143C56 /* Double.swift in Sources */,
 				DB9F58F126EF512300E7BBE9 /* AccountListTableViewCell.swift in Sources */,
 				2D76319F25C1521200929FB9 /* StatusSection.swift in Sources */,
 				DB35FC252612FD7A006193C9 /* ProfileFieldView.swift in Sources */,
 				DB938F0326240EA300E5B6C1 /* CachedThreadViewModel.swift in Sources */,
 				DB6D9F6326357848008423CD /* SettingService.swift in Sources */,
 				2D650FAB25ECDC9300851B58 /* Mastodon+Entity+Error+Detail.swift in Sources */,
 				2D24E12D2626FD2E00A59D4F /* NotificationViewModel+LoadOldestState.swift in Sources */,
 				DBA5A53526F0A36A00CACBAA /* AddAccountTableViewCell.swift in Sources */,
 				2DB72C8C262D764300CE6173 /* Mastodon+Entity+Notification+Type.swift in Sources */,
 				2D35237A26256D920031AF25 /* NotificationSection.swift in Sources */,
 				DB084B5725CBC56C00F898ED /* Status.swift in Sources */,
@ -4075,6 +4139,7 @@
 				DB9D6C3825E508BE0051B173 /* Attachment.swift in Sources */,
 				5DFC35DF262068D20045711D /* SearchViewController+Follow.swift in Sources */,
 				DB8AF52E25C13561002E6C99 /* ViewStateStore.swift in Sources */,
 				DB1D61CF26F1B33600DA8662 /* WelcomeViewModel.swift in Sources */,
 				2DA7D04A25CA52CB00804E11 /* TimelineBottomLoaderTableViewCell.swift in Sources */,
 				DBD376B2269302A4007FEC24 /* UITableViewCell.swift in Sources */,
 				DB4F0966269ED52200D62E92 /* SearchResultViewModel.swift in Sources */,
@ -4105,14 +4170,17 @@
 				2D198649261C0B8500F0B013 /* SearchResultSection.swift in Sources */,
 				DB4F097B26A039FF00D62E92 /* SearchHistorySection.swift in Sources */,
 				DBB525302611EBF3002F1F29 /* ProfilePagingViewModel.swift in Sources */,
 				DB9F58EC26EF435000E7BBE9 /* AccountViewController.swift in Sources */,
 				DBCBCC0B2680B03F000F5B51 /* AsyncHomeTimelineViewModel+LoadOldestState.swift in Sources */,
 				2D5A3D6225CFD9CB002347D6 /* HomeTimelineViewController+DebugAction.swift in Sources */,
 				DB49A62525FF334C00B98345 /* EmojiService+CustomEmojiViewModel+LoadState.swift in Sources */,
 				DB4924E226312AB200E9DB22 /* NotificationService.swift in Sources */,
 				DB6D9F6F2635807F008423CD /* Setting.swift in Sources */,
 				DB647C5726F1E97300F7F82C /* MainTabBarController+Wizard.swift in Sources */,
 				DB6F5E38264E994A009108F4 /* AutoCompleteTopChevronView.swift in Sources */,
 				DBB525412611ED54002F1F29 /* ProfileHeaderViewController.swift in Sources */,
 				DB9D6BFF25E4F5940051B173 /* ProfileViewController.swift in Sources */,
 				DB4932B326F2054200EF46D4 /* CircleAvatarButton.swift in Sources */,
 				0FB3D30825E524C600AAD544 /* PickServerCategoriesCell.swift in Sources */,
 				2D4AD8A226316CD200613EFC /* SelectedAccountSection.swift in Sources */,
 				DB789A1225F9F2CC0071ACA0 /* ComposeViewModel.swift in Sources */,
@ -5825,6 +5893,14 @@
 				minimumVersion = 1.4.1;
 			};
 		};
 		DBA5A52D26F07ED800CACBAA /* XCRemoteSwiftPackageReference "PanModal" */ = {
 			isa = XCRemoteSwiftPackageReference;
 			repositoryURL = "https://github.com/slackhq/PanModal.git";
 			requirement = {
 				kind = upToNextMajorVersion;
 				minimumVersion = 1.2.7;
 			};
 		};
 		DBAC6481267D0B21007FE9FD /* XCRemoteSwiftPackageReference "DifferenceKit" */ = {
 			isa = XCRemoteSwiftPackageReference;
 			repositoryURL = "https://github.com/ra1028/DifferenceKit.git";
@ -5937,6 +6013,11 @@
 			package = DB9A487C2603456B008B817C /* XCRemoteSwiftPackageReference "UITextView-Placeholder" */;
 			productName = "UITextView+Placeholder";
 		};
 		DBA5A52E26F07ED800CACBAA /* PanModal */ = {
 			isa = XCSwiftPackageProductDependency;
 			package = DBA5A52D26F07ED800CACBAA /* XCRemoteSwiftPackageReference "PanModal" */;
 			productName = PanModal;
 		};
 		DBAC6482267D0B21007FE9FD /* DifferenceKit */ = {
 			isa = XCSwiftPackageProductDependency;
 			package = DBAC6481267D0B21007FE9FD /* XCRemoteSwiftPackageReference "DifferenceKit" */;
--- a/Mastodon.xcodeproj/xcuserdata/mainasuk.xcuserdatad/xcschemes/xcschememanagement.plist
+++ b/Mastodon.xcodeproj/xcuserdata/mainasuk.xcuserdatad/xcschemes/xcschememanagement.plist
@ -7,42 +7,42 @@
 		<key>AppShared.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
-			<integer>60</integer>
+			<integer>38</integer>
 		</dict>
 		<key>CoreDataStack.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
-			<integer>62</integer>
+			<integer>35</integer>
 		</dict>
 		<key>Mastodon - ASDK.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
-			<integer>11</integer>
+			<integer>3</integer>
 		</dict>
 		<key>Mastodon - RTL.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
-			<integer>12</integer>
+			<integer>13</integer>
 		</dict>
 		<key>Mastodon - Release.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
-			<integer>10</integer>
+			<integer>2</integer>
 		</dict>
 		<key>Mastodon - ar.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
-			<integer>7</integer>
+			<integer>10</integer>
 		</dict>
 		<key>Mastodon - ca.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
-			<integer>32</integer>
+			<integer>16</integer>
 		</dict>
 		<key>Mastodon - de.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
-			<integer>8</integer>
+			<integer>11</integer>
 		</dict>
 		<key>Mastodon - en.xcscheme_^#shared#^_</key>
 		<dict>
@ -52,42 +52,42 @@
 		<key>Mastodon - es-419.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
-			<integer>5</integer>
+			<integer>8</integer>
 		</dict>
 		<key>Mastodon - es.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
-			<integer>4</integer>
+			<integer>7</integer>
 		</dict>
 		<key>Mastodon - fr.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
-			<integer>6</integer>
+			<integer>9</integer>
 		</dict>
 		<key>Mastodon - jp.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
-			<integer>27</integer>
+			<integer>14</integer>
 		</dict>
 		<key>Mastodon - nl.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
-			<integer>9</integer>
+			<integer>12</integer>
 		</dict>
 		<key>Mastodon - ru.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
-			<integer>2</integer>
+			<integer>4</integer>
 		</dict>
 		<key>Mastodon - th.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
-			<integer>3</integer>
+			<integer>5</integer>
 		</dict>
 		<key>Mastodon - zh_Hans.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
-			<integer>30</integer>
+			<integer>15</integer>
 		</dict>
 		<key>Mastodon.xcscheme_^#shared#^_</key>
 		<dict>
@ -97,7 +97,7 @@
 		<key>MastodonIntent.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
-			<integer>56</integer>
+			<integer>36</integer>
 		</dict>
 		<key>MastodonIntents.xcscheme_^#shared#^_</key>
 		<dict>
@ -112,12 +112,12 @@
 		<key>NotificationService.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
-			<integer>13</integer>
+			<integer>6</integer>
 		</dict>
 		<key>ShareActionExtension.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
-			<integer>58</integer>
+			<integer>37</integer>
 		</dict>
 	</dict>
 	<key>SuppressBuildableAutocreation</key>
--- a/Mastodon.xcworkspace/xcshareddata/swiftpm/Package.resolved
+++ b/Mastodon.xcworkspace/xcshareddata/swiftpm/Package.resolved
@ -127,6 +127,15 @@
          "version": "3.6.2"
        }
      },
      {
        "package": "PanModal",
        "repositoryURL": "https://github.com/slackhq/PanModal.git",
        "state": {
          "branch": null,
          "revision": "b012aecb6b67a8e46369227f893c12544846613f",
          "version": "1.2.7"
        }
      },
      {
        "package": "SDWebImage",
        "repositoryURL": "https://github.com/SDWebImage/SDWebImage.git",
@ -141,8 +150,8 @@
        "repositoryURL": "https://github.com/apple/swift-collections.git",
        "state": {
          "branch": null,
-          "revision": "0959ba76a1d4a98fd11163aa83fd49c25b93bfae",
+          "revision": "9d8719c8bebdc79740b6969c912ac706eb721d7a",
-          "version": "0.0.5"
+          "version": "0.0.7"
        }
      },
      {
--- a/Mastodon/Coordinator/SceneCoordinator.swift
+++ b/Mastodon/Coordinator/SceneCoordinator.swift
@ -7,6 +7,7 @@
 import UIKit
 import SafariServices
 import CoreDataStack
 import PanModal
 final public class SceneCoordinator {
@ -31,6 +32,7 @@ extension SceneCoordinator {
        case show                           // push
        case showDetail                     // replace
        case modal(animated: Bool, completion: (() -> Void)? = nil)
        case panModal
        case custom(transitioningDelegate: UIViewControllerTransitioningDelegate)
        case customPush
        case safariPresent(animated: Bool, completion: (() -> Void)? = nil)
@ -66,6 +68,7 @@ extension SceneCoordinator {
        case hashtagTimeline(viewModel: HashtagTimelineViewModel)
        // profile
        case accountList
        case profile(viewModel: ProfileViewModel)
        case favorite(viewModel: FavoriteViewModel)
@ -184,6 +187,13 @@ extension SceneCoordinator {
            }
            presentingViewController.present(modalNavigationController, animated: animated, completion: completion)
        case .panModal:
            guard let panModalPresentable = viewController as? PanModalPresentable & UIViewController else {
                assertionFailure()
                return nil
            }
            presentingViewController.presentPanModal(panModalPresentable)
        case .custom(let transitioningDelegate):
            viewController.modalPresentationStyle = .custom
            viewController.transitioningDelegate = transitioningDelegate
@ -273,6 +283,9 @@ private extension SceneCoordinator {
            let _viewController = HashtagTimelineViewController()
            _viewController.viewModel = viewModel
            viewController = _viewController
        case .accountList:
            let _viewController = AccountListViewController()
            viewController = _viewController
        case .profile(let viewModel):
            let _viewController = ProfileViewController()
            _viewController.viewModel = viewModel
--- a/Mastodon/Diffiable/DataSource/TableNodeDiffableDataSource.swift
+++ b/Mastodon/Diffiable/DataSource/TableNodeDiffableDataSource.swift
@ -32,7 +32,7 @@ open class TableNodeDiffableDataSource<SectionIdentifierType: Hashable, ItemIden
        self.cellProvider = cellProvider
        super.init()
-        tableNode.dataSource = self
+        tableNode.delegate = self
    }
    /// Applies given snapshot to perform automatic diffing update.
--- a/Mastodon/Extension/MetaLabel.swift
+++ b/Mastodon/Extension/MetaLabel.swift
@ -20,6 +20,8 @@ extension MetaLabel {
        case titleView
        case settingTableFooter
        case autoCompletion
        case accountListName
        case accountListUsername
    }
    convenience init(style: Style) {
@ -74,6 +76,12 @@ extension MetaLabel {
        case .autoCompletion:
            font = UIFontMetrics(forTextStyle: .headline).scaledFont(for: .systemFont(ofSize: 17, weight: .semibold), maximumPointSize: 22)
            textColor = Asset.Colors.brandBlue.color
        case .accountListName:
            font = UIFontMetrics(forTextStyle: .headline).scaledFont(for: .systemFont(ofSize: 17, weight: .regular), maximumPointSize: 22)
            textColor = Asset.Colors.Label.primary.color
        case .accountListUsername:
            font = UIFontMetrics(forTextStyle: .headline).scaledFont(for: .systemFont(ofSize: 15, weight: .regular), maximumPointSize: 20)
            textColor = Asset.Colors.Label.secondary.color
        }
        self.font = font
--- a/Mastodon/Preference/WizardPreference.swift
+++ b/Mastodon/Preference/WizardPreference.swift
@ -0,0 +1,15 @@
 //
 //  WizardPreference.swift
 //  Mastodon
 //
 //  Created by Cirno MainasuK on 2021-9-15.
 //
 import UIKit
 extension UserDefaults {
    @objc dynamic var didShowMultipleAccountSwitchWizard: Bool {
        get { return bool(forKey: #function) }
        set { self[#function] = newValue }
    }
 }
--- a/Mastodon/Scene/Account/AccountListViewModel.swift
+++ b/Mastodon/Scene/Account/AccountListViewModel.swift
@ -0,0 +1,137 @@
 //
 //  AccountListViewModel.swift
 //  Mastodon
 //
 //  Created by Cirno MainasuK on 2021-9-13.
 //
 import UIKit
 import Combine
 import CoreData
 import CoreDataStack
 import MastodonSDK
 import MastodonMeta
 final class AccountListViewModel {
    var disposeBag = Set<AnyCancellable>()
    // input
    let context: AppContext
    // output
    let authentications = CurrentValueSubject<[Item], Never>([])
    let activeUserID = CurrentValueSubject<Mastodon.Entity.Account.ID?, Never>(nil)
    var diffableDataSource: UITableViewDiffableDataSource<Section, Item>!
    init(context: AppContext) {
        self.context = context
        Publishers.CombineLatest(
            context.authenticationService.mastodonAuthentications,
            context.authenticationService.activeMastodonAuthentication
        )
        .sink { [weak self] authentications, activeAuthentication in
            guard let self = self else { return }
            var items: [Item] = []
            var activeUserID: Mastodon.Entity.Account.ID?
            for authentication in authentications {
                let item = Item.authentication(objectID: authentication.objectID)
                items.append(item)
                if authentication === activeAuthentication {
                    activeUserID = authentication.userID
                }
            }
            self.authentications.value = items
            self.activeUserID.value = activeUserID
        }
        .store(in: &disposeBag)
        authentications
            .receive(on: DispatchQueue.main)
            .sink { [weak self] authentications in
                guard let self = self else { return }
                guard let diffableDataSource = self.diffableDataSource else { return }
                var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
                snapshot.appendSections([.main])
                snapshot.appendItems(authentications, toSection: .main)
                snapshot.appendItems([.addAccount], toSection: .main)
                diffableDataSource.apply(snapshot)
            }
            .store(in: &disposeBag)
    }
 }
 extension AccountListViewModel {
    enum Section: Hashable {
        case main
    }
    enum Item: Hashable {
        case authentication(objectID: NSManagedObjectID)
        case addAccount
    }
    func setupDiffableDataSource(
        tableView: UITableView,
        managedObjectContext: NSManagedObjectContext
    ) {
        diffableDataSource = UITableViewDiffableDataSource(tableView: tableView) { tableView, indexPath, item in
            switch item {
            case .authentication(let objectID):
                let authentication = managedObjectContext.object(with: objectID) as! MastodonAuthentication
                let user = authentication.user
                let cell = tableView.dequeueReusableCell(withIdentifier: String(describing: AccountListTableViewCell.self), for: indexPath) as! AccountListTableViewCell
                AccountListViewModel.configure(
                    cell: cell,
                    user: user,
                    activeUserID: self.activeUserID.eraseToAnyPublisher()
                )
                return cell
            case .addAccount:
                let cell = tableView.dequeueReusableCell(withIdentifier: String(describing: AddAccountTableViewCell.self), for: indexPath) as! AddAccountTableViewCell
                return cell
            }
        }
        var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
        snapshot.appendSections([.main])
        diffableDataSource?.apply(snapshot)
    }
    static func configure(
        cell: AccountListTableViewCell,
        user: MastodonUser,
        activeUserID: AnyPublisher<Mastodon.Entity.Account.ID?, Never>
    ) {
        // avatar
        cell.configure(with: AvatarConfigurableViewConfiguration(avatarImageURL: user.avatarImageURL()))
        // name
        do {
            let content = MastodonContent(content: user.displayNameWithFallback, emojis: user.emojiMeta)
            let metaContent = try MastodonMetaContent.convert(document: content)
            cell.nameLabel.configure(content: metaContent)
        } catch {
            assertionFailure()
            cell.nameLabel.configure(content: PlaintextMetaContent(string: user.displayNameWithFallback))
        }
        // username
        let usernameMetaContent = PlaintextMetaContent(string: "@" + user.acctWithDomain)
        cell.usernameLabel.configure(content: usernameMetaContent)
        // checkmark
        activeUserID
            .receive(on: DispatchQueue.main)
            .sink { userID in
                let isCurrentUser =  user.id == userID
                cell.tintColor = .label
                cell.accessoryType = isCurrentUser ? .checkmark : .none
            }
            .store(in: &cell.disposeBag)
    }
 }
--- a/Mastodon/Scene/Account/AccountViewController.swift
+++ b/Mastodon/Scene/Account/AccountViewController.swift
@ -0,0 +1,153 @@
 //
 //  AccountViewController.swift
 //  Mastodon
 //
 //  Created by Cirno MainasuK on 2021-9-13.
 //
 import os.log
 import UIKit
 import Combine
 import CoreDataStack
 import PanModal
 final class AccountListViewController: UIViewController, NeedsDependency {
    let logger = Logger(subsystem: "AccountListViewController", category: "UI")
    weak var context: AppContext! { willSet { precondition(!isViewLoaded) } }
    weak var coordinator: SceneCoordinator! { willSet { precondition(!isViewLoaded) } }
    var disposeBag = Set<AnyCancellable>()
    private(set) lazy var viewModel = AccountListViewModel(context: context)
    private(set) lazy var addBarButtonItem: UIBarButtonItem = {
        let barButtonItem = UIBarButtonItem(
            image: UIImage(systemName: "plus"),
            style: .plain,
            target: self,
            action: #selector(AccountListViewController.addBarButtonItem(_:))
        )
        return barButtonItem
    }()
    let dragIndicatorView = DragIndicatorView()
    private(set) lazy var tableView: UITableView = {
        let tableView = UITableView()
        tableView.register(AccountListTableViewCell.self, forCellReuseIdentifier: String(describing: AccountListTableViewCell.self))
        tableView.register(AddAccountTableViewCell.self, forCellReuseIdentifier: String(describing: AddAccountTableViewCell.self))
        tableView.backgroundColor = .clear
        tableView.tableFooterView = UIView()
        tableView.separatorStyle = .none
        return tableView
    }()
 }
 // MARK: - PanModalPresentable
 extension AccountListViewController: PanModalPresentable {
    var panScrollable: UIScrollView? { tableView }
    var showDragIndicator: Bool { false }
    var shortFormHeight: PanModalHeight {
        return .contentHeight(300)
    }
    var longFormHeight: PanModalHeight {
        return .maxHeightWithTopInset(40)
    }
 }
 extension AccountListViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = ThemeService.shared.currentTheme.value.systemBackgroundColor.withAlphaComponent(0.9)
        ThemeService.shared.currentTheme
            .receive(on: DispatchQueue.main)
            .sink { [weak self] theme in
                guard let self = self else { return }
                self.setupBackgroundColor(theme: theme)
            }
            .store(in: &disposeBag)
        navigationItem.rightBarButtonItem = addBarButtonItem
        dragIndicatorView.translatesAutoresizingMaskIntoConstraints = false
        view.addSubview(dragIndicatorView)
        NSLayoutConstraint.activate([
            dragIndicatorView.topAnchor.constraint(equalTo: view.topAnchor),
            dragIndicatorView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
            dragIndicatorView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
            dragIndicatorView.heightAnchor.constraint(equalToConstant: DragIndicatorView.height).priority(.required - 1),
        ])
        tableView.translatesAutoresizingMaskIntoConstraints = false
        view.addSubview(tableView)
        NSLayoutConstraint.activate([
            tableView.topAnchor.constraint(equalTo: dragIndicatorView.bottomAnchor),
            tableView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
            tableView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
            tableView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
        ])
        tableView.delegate = self
        viewModel.setupDiffableDataSource(
            tableView: tableView,
            managedObjectContext: context.managedObjectContext
        )
        if UIAccessibility.isVoiceOverRunning {
            let dragIndicatorTapGestureRecognizer = UITapGestureRecognizer.singleTapGestureRecognizer
            dragIndicatorView.addGestureRecognizer(dragIndicatorTapGestureRecognizer)
            dragIndicatorTapGestureRecognizer.addTarget(self, action: #selector(AccountListViewController.dragIndicatorTapGestureRecognizerHandler(_:)))
            dragIndicatorView.isAccessibilityElement = true
            dragIndicatorView.accessibilityLabel = "Dismiss Account Switcher"
        }
    }
    private func setupBackgroundColor(theme: Theme) {
        view.backgroundColor = theme.systemBackgroundColor.withAlphaComponent(0.9)
    }
 }
 extension AccountListViewController {
    @objc private func addBarButtonItem(_ sender: UIBarButtonItem) {
        logger.debug("\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public)")
        coordinator.present(scene: .welcome, from: self, transition: .modal(animated: true, completion: nil))
    }
    @objc private func dragIndicatorTapGestureRecognizerHandler(_ sender: UITapGestureRecognizer) {
        logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public)")
        dismiss(animated: true, completion: nil)
    }
 }
 // MARK: - UITableViewDelegate
 extension AccountListViewController: UITableViewDelegate {
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        tableView.deselectRow(at: indexPath, animated: true)
        guard let diffableDataSource = viewModel.diffableDataSource else { return }
        guard let item = diffableDataSource.itemIdentifier(for: indexPath) else { return }
        switch item {
        case .authentication(let objectID):
            assert(Thread.isMainThread)
            let authentication = context.managedObjectContext.object(with: objectID) as! MastodonAuthentication
            context.authenticationService.activeMastodonUser(domain: authentication.domain, userID: authentication.userID)
                .receive(on: DispatchQueue.main)
                .sink { [weak self] result in
                    guard let self = self else { return }
                    self.coordinator.setup()
                }
                .store(in: &disposeBag)
        case .addAccount:
            // TODO: add dismiss entry for welcome scene
            coordinator.present(scene: .welcome, from: self, transition: .modal(animated: true, completion: nil))
        }
    }
 }
--- a/Mastodon/Scene/Account/Cell/AccountListTableViewCell.swift
+++ b/Mastodon/Scene/Account/Cell/AccountListTableViewCell.swift
@ -0,0 +1,93 @@
 //
 //  AccountListTableViewCell.swift
 //  Mastodon
 //
 //  Created by Cirno MainasuK on 2021-9-13.
 //
 import UIKit
 import Combine
 import FLAnimatedImage
 import MetaTextKit
 final class AccountListTableViewCell: UITableViewCell {
    var disposeBag = Set<AnyCancellable>()
    let avatarButton = CircleAvatarButton(frame: .zero)
    let nameLabel = MetaLabel(style: .accountListName)
    let usernameLabel = MetaLabel(style: .accountListUsername)
    let separatorLine = UIView.separatorLine
    override func prepareForReuse() {
        super.prepareForReuse()
        disposeBag.removeAll()
    }
    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        _init()
    }
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        _init()
    }
 }
 extension AccountListTableViewCell {
    private func _init() {
        avatarButton.translatesAutoresizingMaskIntoConstraints = false
        contentView.addSubview(avatarButton)
        NSLayoutConstraint.activate([
            avatarButton.leadingAnchor.constraint(equalTo: contentView.readableContentGuide.leadingAnchor),
            avatarButton.centerYAnchor.constraint(equalTo: contentView.centerYAnchor),
            avatarButton.heightAnchor.constraint(equalTo: avatarButton.widthAnchor, multiplier: 1.0).priority(.required - 1),
            avatarButton.heightAnchor.constraint(greaterThanOrEqualToConstant: 30).priority(.required - 1),
        ])
        avatarButton.setContentHuggingPriority(.defaultLow, for: .horizontal)
        avatarButton.setContentHuggingPriority(.defaultLow, for: .vertical)
        let labelContainerStackView = UIStackView()
        labelContainerStackView.axis = .vertical
        labelContainerStackView.distribution = .equalCentering
        labelContainerStackView.spacing = 2
        labelContainerStackView.distribution = .fillProportionally
        labelContainerStackView.translatesAutoresizingMaskIntoConstraints = false
        contentView.addSubview(labelContainerStackView)
        NSLayoutConstraint.activate([
            labelContainerStackView.topAnchor.constraint(equalTo: contentView.topAnchor, constant: 8),
            labelContainerStackView.leadingAnchor.constraint(equalTo: avatarButton.trailingAnchor, constant: 10),
            contentView.bottomAnchor.constraint(equalTo: labelContainerStackView.bottomAnchor, constant: 10),
            avatarButton.heightAnchor.constraint(equalTo: labelContainerStackView.heightAnchor, multiplier: 0.8).priority(.required - 10),
            labelContainerStackView.trailingAnchor.constraint(equalTo: contentView.trailingAnchor),
        ])
        labelContainerStackView.addArrangedSubview(nameLabel)
        labelContainerStackView.addArrangedSubview(usernameLabel)
        avatarButton.isUserInteractionEnabled = false
        nameLabel.isUserInteractionEnabled = false
        usernameLabel.isUserInteractionEnabled = false
        separatorLine.translatesAutoresizingMaskIntoConstraints = false
        contentView.addSubview(separatorLine)
        NSLayoutConstraint.activate([
            separatorLine.leadingAnchor.constraint(equalTo: contentView.readableContentGuide.leadingAnchor),
            separatorLine.trailingAnchor.constraint(equalTo: trailingAnchor),   // needs align to edge
            separatorLine.bottomAnchor.constraint(equalTo: contentView.bottomAnchor),
            separatorLine.heightAnchor.constraint(equalToConstant: UIView.separatorLineHeight(of: contentView)),
        ])
    }
 }
 // MARK: - AvatarConfigurableView
 extension AccountListTableViewCell: AvatarConfigurableView {
    static var configurableAvatarImageSize: CGSize { CGSize(width: 30, height: 30) }
    static var configurableAvatarImageCornerRadius: CGFloat { 0 }
    var configurableAvatarImageView: FLAnimatedImageView? { avatarButton.avatarImageView }
 }
--- a/Mastodon/Scene/Account/Cell/AddAccountTableViewCell.swift
+++ b/Mastodon/Scene/Account/Cell/AddAccountTableViewCell.swift
@ -0,0 +1,75 @@
 //
 //  AddAccountTableViewCell.swift
 //  Mastodon
 //
 //  Created by Cirno MainasuK on 2021-9-14.
 //
 import UIKit
 import MetaTextKit
 final class AddAccountTableViewCell: UITableViewCell {
    let iconImageView: UIImageView = {
        let image = UIImage(systemName: "plus.circle.fill")!
        let imageView = UIImageView(image: image)
        imageView.tintColor = Asset.Colors.Label.primary.color
        return imageView
    }()
    let titleLabel: UILabel = {
        let label = UILabel()
        label.font = UIFontMetrics(forTextStyle: .headline).scaledFont(for: .systemFont(ofSize: 17, weight: .regular), maximumPointSize: 22)
        label.textColor = Asset.Colors.Label.primary.color
        label.text = "Add Account"  // TODO: i18n
        return label
    }()
    let usernameLabel = MetaLabel(style: .accountListUsername)
    let separatorLine = UIView.separatorLine
    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        _init()
    }
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        _init()
    }
 }
 extension AddAccountTableViewCell {
    private func _init() {
        iconImageView.translatesAutoresizingMaskIntoConstraints = false
        contentView.addSubview(iconImageView)
        NSLayoutConstraint.activate([
            iconImageView.leadingAnchor.constraint(equalTo: contentView.readableContentGuide.leadingAnchor),
            iconImageView.centerYAnchor.constraint(equalTo: contentView.centerYAnchor),
            iconImageView.heightAnchor.constraint(equalTo: iconImageView.widthAnchor, multiplier: 1.0).priority(.required - 1),
            iconImageView.heightAnchor.constraint(greaterThanOrEqualToConstant: 30).priority(.required - 1),
        ])
        iconImageView.setContentHuggingPriority(.defaultLow, for: .horizontal)
        iconImageView.setContentHuggingPriority(.defaultLow, for: .vertical)
        titleLabel.translatesAutoresizingMaskIntoConstraints = false
        contentView.addSubview(titleLabel)
        NSLayoutConstraint.activate([
            titleLabel.topAnchor.constraint(equalTo: contentView.topAnchor, constant: 19),
            titleLabel.leadingAnchor.constraint(equalTo: iconImageView.trailingAnchor, constant: 10),
            contentView.bottomAnchor.constraint(equalTo: titleLabel.bottomAnchor, constant: 19),
            iconImageView.heightAnchor.constraint(equalTo: titleLabel.heightAnchor, multiplier: 1.0).priority(.required - 10),
            titleLabel.trailingAnchor.constraint(equalTo: contentView.trailingAnchor),
        ])
        separatorLine.translatesAutoresizingMaskIntoConstraints = false
        contentView.addSubview(separatorLine)
        NSLayoutConstraint.activate([
            separatorLine.leadingAnchor.constraint(equalTo: contentView.leadingAnchor),
            separatorLine.trailingAnchor.constraint(equalTo: contentView.trailingAnchor),
            separatorLine.bottomAnchor.constraint(equalTo: contentView.bottomAnchor),
            separatorLine.heightAnchor.constraint(equalToConstant: UIView.separatorLineHeight(of: contentView)),
        ])
    }
 }
--- a/Mastodon/Scene/Account/View/DragIndicatorView.swift
+++ b/Mastodon/Scene/Account/View/DragIndicatorView.swift
@ -0,0 +1,55 @@
 //
 //  DragIndicatorView.swift
 //  Mastodon
 //
 //  Created by Cirno MainasuK on 2021-9-14.
 //
 import UIKit
 final class DragIndicatorView: UIView {
    static let height: CGFloat = 38
    let barView = UIView()
    let separatorLine = UIView.separatorLine
    override init(frame: CGRect) {
        super.init(frame: frame)
        _init()
    }
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        _init()
    }
 }
 extension DragIndicatorView {
    private func _init() {
        barView.backgroundColor = Asset.Colors.Label.secondary.color
        barView.layer.masksToBounds = true
        barView.layer.cornerRadius = 2.5
        barView.translatesAutoresizingMaskIntoConstraints = false
        addSubview(barView)
        NSLayoutConstraint.activate([
            barView.centerXAnchor.constraint(equalTo: centerXAnchor),
            barView.centerYAnchor.constraint(equalTo: centerYAnchor),
            barView.heightAnchor.constraint(equalToConstant: 5).priority(.required - 1),
            barView.widthAnchor.constraint(equalToConstant: 36).priority(.required - 1),
        ])
        separatorLine.translatesAutoresizingMaskIntoConstraints = false
        addSubview(separatorLine)
        NSLayoutConstraint.activate([
            separatorLine.leadingAnchor.constraint(equalTo: leadingAnchor),
            separatorLine.trailingAnchor.constraint(equalTo: trailingAnchor),
            separatorLine.bottomAnchor.constraint(equalTo: bottomAnchor),
            separatorLine.heightAnchor.constraint(equalToConstant: UIView.separatorLineHeight(of: self)),
        ])
    }
 }
--- a/Mastodon/Scene/HomeTimeline/HomeTimelineViewController+DebugAction.swift
+++ b/Mastodon/Scene/HomeTimeline/HomeTimelineViewController+DebugAction.swift
@ -23,20 +23,9 @@ extension HomeTimelineViewController {
            identifier: nil,
            options: .displayInline,
            children: [
-                UIAction(title: "Show FLEX", image: nil, attributes: [], handler: { [weak self] action in
+                showMenu,
                    guard let self = self else { return }
                    self.showFLEXAction(action)
                }),
                moveMenu,
                dropMenu,
                UIAction(title: "Show Welcome", image: UIImage(systemName: "figure.walk"), attributes: []) { [weak self] action in
                    guard let self = self else { return }
                    self.showWelcomeAction(action)
                },
                UIAction(title: "Show Confirm Email", image: UIImage(systemName: "envelope"), attributes: []) { [weak self] action in
                    guard let self = self else { return }
                    self.showConfirmEmail(action)
                },
                UIAction(title: "Toggle EmptyView", image: UIImage(systemName: "clear"), attributes: []) { [weak self] action in
                    guard let self = self else { return }
                    if self.emptyView.superview != nil {
@ -45,18 +34,6 @@ extension HomeTimelineViewController {
                        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)
                },
                UIAction(title: "Show Profile", image: UIImage(systemName: "person.crop.circle"), attributes: []) { [weak self] action in
                    guard let self = self else { return }
                    self.showProfileAction(action)
                },
                UIAction(title: "Show Thread", image: UIImage(systemName: "bubble.left.and.bubble.right"), attributes: []) { [weak self] action in
                    guard let self = self else { return }
                    self.showThreadAction(action)
                },
                UIAction(title: "Settings", image: UIImage(systemName: "gear"), attributes: []) { [weak self] action in
                    guard let self = self else { return }
                    self.showSettings(action)
@ -70,6 +47,45 @@ extension HomeTimelineViewController {
        return menu
    }
    var showMenu: UIMenu {
        return UIMenu(
            title: "Show…",
            image: UIImage(systemName: "plus.rectangle.on.rectangle"),
            identifier: nil,
            options: [],
            children: [
                UIAction(title: "FLEX", image: nil, attributes: [], handler: { [weak self] action in
                    guard let self = self else { return }
                    self.showFLEXAction(action)
                }),
                UIAction(title: "Welcome", image: UIImage(systemName: "figure.walk"), attributes: []) { [weak self] action in
                    guard let self = self else { return }
                    self.showWelcomeAction(action)
                },
                UIAction(title: "Confirm Email", image: UIImage(systemName: "envelope"), attributes: []) { [weak self] action in
                    guard let self = self else { return }
                    self.showConfirmEmail(action)
                },
                UIAction(title: "Account List", image: UIImage(systemName: "person"), attributes: []) { [weak self] action in
                    guard let self = self else { return }
                    self.showAccountList(action)
                },
                UIAction(title: "Public Timeline", image: UIImage(systemName: "list.dash"), attributes: []) { [weak self] action in
                    guard let self = self else { return }
                    self.showPublicTimelineAction(action)
                },
                UIAction(title: "Profile", image: UIImage(systemName: "person.crop.circle"), attributes: []) { [weak self] action in
                    guard let self = self else { return }
                    self.showProfileAction(action)
                },
                UIAction(title: "Thread", image: UIImage(systemName: "bubble.left.and.bubble.right"), attributes: []) { [weak self] action in
                    guard let self = self else { return }
                    self.showThreadAction(action)
                },
            ]
        )
    }
    var moveMenu: UIMenu {
        return UIMenu(
            title: "Move to…",
@ -322,6 +338,10 @@ extension HomeTimelineViewController {
        coordinator.present(scene: .mastodonConfirmEmail(viewModel: mastodonConfirmEmailViewModel), from: nil, transition: .modal(animated: true, completion: nil))
    }
    @objc private func showAccountList(_ sender: UIAction) {
        coordinator.present(scene: .accountList, from: self, transition: .modal(animated: true, completion: nil))
    }
    @objc private func showPublicTimelineAction(_ sender: UIAction) {
        coordinator.present(scene: .publicTimeline, from: self, transition: .show)
    }
--- a/Mastodon/Scene/MainTab/MainTabBarController+Wizard.swift
+++ b/Mastodon/Scene/MainTab/MainTabBarController+Wizard.swift
@ -0,0 +1,124 @@
 //
 //  MainTabBarController+Wizard.swift
 //  Mastodon
 //
 //  Created by Cirno MainasuK on 2021-9-15.
 //
 import os.log
 import UIKit
 protocol WizardDelegate: AnyObject {
    func spotlight(item: MainTabBarController.Wizard.Item) -> UIBezierPath
    func layoutWizardCard(_ wizard: MainTabBarController.Wizard, item: MainTabBarController.Wizard.Item)
 }
 extension MainTabBarController {
    class Wizard {
        let logger = Logger(subsystem: "Wizard", category: "UI")
        weak var delegate: WizardDelegate?
        private(set) var items: [Item]
        let backgroundView: UIView = {
            let view = UIView()
            view.backgroundColor = UIColor.black.withAlphaComponent(0.7)
            return view
        }()
        init() {
            var items: [Item] = []
            if !UserDefaults.shared.didShowMultipleAccountSwitchWizard {
                items.append(.multipleAccountSwitch)
            }
            self.items = items
            let backgroundTapGestureRecognizer = UITapGestureRecognizer.singleTapGestureRecognizer
            backgroundTapGestureRecognizer.addTarget(self, action: #selector(MainTabBarController.Wizard.backgroundTapGestureRecognizerHandler(_:)))
            backgroundView.addGestureRecognizer(backgroundTapGestureRecognizer)
        }
    }
 }
 extension MainTabBarController.Wizard {
    enum Item {
        case multipleAccountSwitch
        var title: String {
            return "New in Mastodon"
        }
        var description: String {
            switch self {
            case .multipleAccountSwitch:
                return "Switch between multiple accounts by holding the profile button."
            }
        }
    }
 }
 extension MainTabBarController.Wizard {
    func setup(in view: UIView) {
        assert(delegate != nil, "need set delegate before use")
        backgroundView.frame = view.bounds
        backgroundView.translatesAutoresizingMaskIntoConstraints = false
        view.addSubview(backgroundView)
        NSLayoutConstraint.activate([
            backgroundView.topAnchor.constraint(equalTo: view.topAnchor),
            backgroundView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
            backgroundView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
            backgroundView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
        ])
    }
    func consume() {
        guard !items.isEmpty else {
            backgroundView.removeFromSuperview()
            return
        }
        let item = items.removeFirst()
        perform(item: item)
    }
    private func perform(item: Item) {
        guard let delegate = delegate else {
            assertionFailure()
            return
        }
        prepareForReuse()
        // add spotlight
        let spotlight = delegate.spotlight(item: item)
        let maskLayer = CAShapeLayer()
        let path = UIBezierPath(rect: backgroundView.bounds)
        path.append(spotlight)
        maskLayer.fillRule = .evenOdd
        maskLayer.path = path.cgPath
        backgroundView.layer.mask = maskLayer
        // layout wizard card
        delegate.layoutWizardCard(self, item: item)
    }
    private func prepareForReuse() {
        backgroundView.subviews.forEach { subview in
            subview.removeFromSuperview()
        }
        backgroundView.mask = nil
        backgroundView.layer.mask = nil
    }
 }
 extension MainTabBarController.Wizard {
    @objc private func backgroundTapGestureRecognizerHandler(_ sender: UITapGestureRecognizer) {
        logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public)")
        // TODO: toggle current item preference flag
        consume()
    }
 }
--- a/Mastodon/Scene/MainTab/MainTabBarController.swift
+++ b/Mastodon/Scene/MainTab/MainTabBarController.swift
@ -12,11 +12,18 @@ import SafariServices
 class MainTabBarController: UITabBarController {
    let logger = Logger(subsystem: "MainTabBarController", category: "UI")
    var disposeBag = Set<AnyCancellable>()
    weak var context: AppContext!
    weak var coordinator: SceneCoordinator!
    static let avatarButtonSize = CGSize(width: 28, height: 28)
    let avatarButton = CircleAvatarButton()
    let wizard = Wizard()
    var currentTab = Tab.home
    enum Tab: Int, CaseIterable {
@ -25,6 +32,10 @@ class MainTabBarController: UITabBarController {
        case notification
        case me
        var tag: Int {
            return rawValue
        }
        var title: String {
            switch self {
            case .home:             return L10n.Common.Controls.Tabs.home
@ -121,6 +132,7 @@ extension MainTabBarController {
        let tabs = Tab.allCases
        let viewControllers: [UIViewController] = tabs.map { tab in
            let viewController = tab.viewController(context: context, coordinator: coordinator)
            viewController.tabBarItem.tag = tab.tag
            viewController.tabBarItem.title = tab.title
            viewController.tabBarItem.image = tab.image
            viewController.tabBarItem.accessibilityLabel = tab.title
@ -204,11 +216,105 @@ extension MainTabBarController {
            }
            .store(in: &disposeBag)
        layoutAvatarButton()
        context.authenticationService.activeMastodonAuthentication
            .receive(on: DispatchQueue.main)
            .sink { [weak self] activeMastodonAuthentication in
                guard let self = self else { return }
                let avatarImageURL = activeMastodonAuthentication?.user.avatarImageURL()
                self.avatarButton.avatarImageView.setImage(
                    url: avatarImageURL,
                    placeholder: .placeholder(color: .systemFill),
                    scaleToSize: MainTabBarController.avatarButtonSize
                )
                // a11y
                let _profileTabItem = self.tabBar.items?.first { item in item.tag == Tab.me.tag }
                guard let profileTabItem = _profileTabItem else { return }
                let currentUserDisplayName = activeMastodonAuthentication?.user.displayNameWithFallback ?? "no user"
                profileTabItem.accessibilityHint = "Current selected profile: \(currentUserDisplayName). Double tap then hold to show account switcher"
            }
            .store(in: &disposeBag)
        wizard.delegate = self
        wizard.setup(in: view)
        let tabBarLongPressGestureRecognizer = UILongPressGestureRecognizer()
        tabBarLongPressGestureRecognizer.addTarget(self, action: #selector(MainTabBarController.tabBarLongPressGestureRecognizerHandler(_:)))
        tabBar.addGestureRecognizer(tabBarLongPressGestureRecognizer)
        #if DEBUG
 //        selectedIndex = 1
        #endif
    }
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        wizard.consume()
    }
 }
 extension MainTabBarController {
    @objc private func tabBarLongPressGestureRecognizerHandler(_ sender: UILongPressGestureRecognizer) {
        guard sender.state == .began else { return }
        var _tab: Tab?
        let location = sender.location(in: tabBar)
        for item in tabBar.items ?? [] {
            guard let tab = Tab(rawValue: item.tag) else { continue }
            guard let view = item.value(forKey: "view") as? UIView else { continue }
            guard view.frame.contains(location) else { continue}
            _tab = tab
            break
        }
        guard let tab = _tab else { return }
        logger.debug("\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): long press \(tab.title) tab")
        switch tab {
        case .me:
            coordinator.present(scene: .accountList, from: nil, transition: .panModal)
        default:
            break
        }
    }
 }
 extension MainTabBarController {
    private func layoutAvatarButton() {
        guard avatarButton.superview == nil else { return }
        let _profileTabItem = self.tabBar.items?.first { item in item.tag == Tab.me.tag }
        guard let profileTabItem = _profileTabItem else { return }
        guard let view = profileTabItem.value(forKey: "view") as? UIView else {
            return
        }
        let _anchorImageView = view.subviews.first { subview in subview is UIImageView } as? UIImageView
        guard let anchorImageView = _anchorImageView else {
            assertionFailure()
            return
        }
        anchorImageView.alpha = 0
        self.avatarButton.translatesAutoresizingMaskIntoConstraints = false
        view.addSubview(self.avatarButton)
        NSLayoutConstraint.activate([
            self.avatarButton.centerXAnchor.constraint(equalTo: view.centerXAnchor),
            self.avatarButton.centerYAnchor.constraint(equalTo: anchorImageView.centerYAnchor),
            self.avatarButton.widthAnchor.constraint(equalToConstant: MainTabBarController.avatarButtonSize.width).priority(.required - 1),
            self.avatarButton.heightAnchor.constraint(equalToConstant: MainTabBarController.avatarButtonSize.height).priority(.required - 1),
        ])
        self.avatarButton.setContentHuggingPriority(.required - 1, for: .horizontal)
        self.avatarButton.setContentHuggingPriority(.required - 1, for: .vertical)
        self.avatarButton.isUserInteractionEnabled = false
    }
 }
 extension MainTabBarController {
@ -239,6 +345,53 @@ extension MainTabBarController: UITabBarControllerDelegate {
    }
 }
 // MARK: - WizardDataSource
 extension MainTabBarController: WizardDelegate {
    func spotlight(item: Wizard.Item) -> UIBezierPath {
        switch item {
        case .multipleAccountSwitch:
            guard let avatarButtonFrameInView = avatarButtonFrameInView() else {
                return UIBezierPath()
            }
            return UIBezierPath(ovalIn: avatarButtonFrameInView)
        }
    }
    func layoutWizardCard(_ wizard: MainTabBarController.Wizard, item: Wizard.Item) {
        switch item {
        case .multipleAccountSwitch:
            guard let avatarButtonFrameInView = avatarButtonFrameInView() else {
                return
            }
            let anchorView = UIView()
            anchorView.frame = avatarButtonFrameInView
            wizard.backgroundView.addSubview(anchorView)
            let wizardCardView = WizardCardView()
            wizardCardView.arrowRectCorner = view.traitCollection.layoutDirection == .leftToRight ? .bottomRight : .bottomLeft
            wizardCardView.titleLabel.text = item.title
            wizardCardView.descriptionLabel.text = item.description
            wizardCardView.translatesAutoresizingMaskIntoConstraints = false
            wizard.backgroundView.addSubview(wizardCardView)
            NSLayoutConstraint.activate([
                anchorView.topAnchor.constraint(equalTo: wizardCardView.bottomAnchor, constant: 13), // 13pt spacing
                wizardCardView.trailingAnchor.constraint(equalTo: anchorView.centerXAnchor),
                wizardCardView.widthAnchor.constraint(equalTo: wizard.backgroundView.widthAnchor, multiplier: 2.0/3.0).priority(.required - 1),
            ])
            wizardCardView.setContentHuggingPriority(.defaultLow, for: .vertical)
        }
    }
    private func avatarButtonFrameInView() -> CGRect? {
        guard let superview = avatarButton.superview else {
            assertionFailure()
            return nil
        }
        return superview.convert(avatarButton.frame, to: view)
    }
 }
 // HIG: keyboard UX
 // https://developer.apple.com/design/human-interface-guidelines/macos/user-interaction/keyboard/
--- a/Mastodon/Scene/Onboarding/PickServer/MastodonPickServerViewController.swift
+++ b/Mastodon/Scene/Onboarding/PickServer/MastodonPickServerViewController.swift
@ -222,7 +222,8 @@ extension MastodonPickServerViewController {
                    assertionFailure(error.localizedDescription)
                case .success(let isActived):
                    assert(isActived)
-                    self.dismiss(animated: true, completion: nil)
+                    // self.dismiss(animated: true, completion: nil)
                    self.coordinator.setup()
                }
            }
            .store(in: &disposeBag)
--- a/Mastodon/Scene/Onboarding/Welcome/View/WizardCardView.swift
+++ b/Mastodon/Scene/Onboarding/Welcome/View/WizardCardView.swift
@ -0,0 +1,110 @@
 //
 //  WizardCardView.swift
 //  Mastodon
 //
 //  Created by Cirno MainasuK on 2021-9-15.
 //
 import UIKit
 final class WizardCardView: UIView {
    static let bubbleArrowHeight: CGFloat = 17
    static let bubbleArrowWidth: CGFloat = 20
    let contentView = UIView()
    let backgroundShapeLayer = CAShapeLayer()
    var arrowRectCorner: UIRectCorner = .bottomRight
    let titleLabel: UILabel = {
        let label = UILabel()
        label.font = UIFontMetrics(forTextStyle: .headline).scaledFont(for: .systemFont(ofSize: 15, weight: .semibold))
        label.textColor = .black
        return label
    }()
    let descriptionLabel: UILabel = {
        let label = UILabel()
        label.font = UIFontMetrics(forTextStyle: .subheadline).scaledFont(for: .systemFont(ofSize: 13, weight: .regular))
        label.textColor = .black
        label.numberOfLines = 0
        return label
    }()
    override init(frame: CGRect) {
        super.init(frame: frame)
        _init()
    }
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        _init()
    }
 }
 extension WizardCardView {
    private func _init() {
        layer.masksToBounds = false
        layer.addSublayer(backgroundShapeLayer)
        contentView.translatesAutoresizingMaskIntoConstraints = false
        addSubview(contentView)
        NSLayoutConstraint.activate([
            contentView.topAnchor.constraint(equalTo: topAnchor, constant: WizardCardView.bubbleArrowHeight),
            contentView.leadingAnchor.constraint(equalTo: leadingAnchor),
            trailingAnchor.constraint(equalTo: contentView.trailingAnchor),
            bottomAnchor.constraint(equalTo: contentView.bottomAnchor, constant: WizardCardView.bubbleArrowHeight),
        ])
        let containerStackView = UIStackView()
        containerStackView.axis = .vertical
        containerStackView.spacing = 2
        containerStackView.translatesAutoresizingMaskIntoConstraints = false
        contentView.addSubview(containerStackView)
        NSLayoutConstraint.activate([
            containerStackView.topAnchor.constraint(equalTo: contentView.topAnchor, constant: 5),
            containerStackView.leadingAnchor.constraint(equalTo: contentView.leadingAnchor, constant: 7),
            contentView.trailingAnchor.constraint(equalTo: containerStackView.trailingAnchor, constant: 24),
            contentView.bottomAnchor.constraint(equalTo: containerStackView.bottomAnchor, constant: 5),
        ])
        containerStackView.addArrangedSubview(titleLabel)
        containerStackView.addArrangedSubview(descriptionLabel)
    }
    override func layoutSubviews() {
        super.layoutSubviews()
        let radius: CGFloat = 5
        let rect = contentView.frame
        let path = UIBezierPath()
        switch arrowRectCorner {
        case .bottomRight:
            path.move(to: CGPoint(x: rect.maxX - WizardCardView.bubbleArrowWidth, y: rect.maxY + radius))
            path.addArc(withCenter: CGPoint(x: rect.minX, y: rect.maxY), radius: radius, startAngle: .pi / 2, endAngle: .pi, clockwise: true)
            path.addArc(withCenter: CGPoint(x: rect.minX, y: rect.minY), radius: radius, startAngle: .pi, endAngle: .pi / 2 * 3, clockwise: true)
            path.addArc(withCenter: CGPoint(x: rect.maxX, y: rect.minY), radius: radius, startAngle: .pi / 2 * 3, endAngle: .pi * 2, clockwise: true)
            path.addLine(to: CGPoint(x: rect.maxX + radius, y: rect.maxY + radius + WizardCardView.bubbleArrowHeight))
            path.close()
        case .bottomLeft:
            path.move(to: CGPoint(x: rect.minX + WizardCardView.bubbleArrowWidth, y: rect.maxY + radius))
            path.addArc(withCenter: CGPoint(x: rect.maxX, y: rect.maxY), radius: radius, startAngle: .pi / 2, endAngle: 0, clockwise: false)
            path.addArc(withCenter: CGPoint(x: rect.maxX, y: rect.minY), radius: radius, startAngle: 0, endAngle: -.pi / 2, clockwise: false)
            path.addArc(withCenter: CGPoint(x: rect.minX, y: rect.minY), radius: radius, startAngle: -.pi / 2, endAngle: -.pi, clockwise: false)
            path.addLine(to: CGPoint(x: rect.minX - radius, y: rect.maxY + radius + WizardCardView.bubbleArrowHeight))
            path.close()
        default:
            assertionFailure("FIXME")
        }
        backgroundShapeLayer.lineCap = .round
        backgroundShapeLayer.lineJoin = .round
        backgroundShapeLayer.lineWidth = 3
        backgroundShapeLayer.strokeColor = UIColor.white.cgColor
        backgroundShapeLayer.fillColor = UIColor.white.cgColor
        backgroundShapeLayer.path = path.cgPath
    }
 }
--- a/Mastodon/Scene/Onboarding/Welcome/WelcomeViewController.swift
+++ b/Mastodon/Scene/Onboarding/Welcome/WelcomeViewController.swift
@ -7,15 +7,21 @@
 import os.log
 import UIKit
 import Combine
 final class WelcomeViewController: UIViewController, NeedsDependency {
    weak var context: AppContext! { willSet { precondition(!isViewLoaded) } }
    weak var coordinator: SceneCoordinator! { willSet { precondition(!isViewLoaded) } }
    var disposeBag = Set<AnyCancellable>()
    private(set) lazy var viewModel = WelcomeViewModel(context: context)
    let welcomeIllustrationView = WelcomeIllustrationView()
    var welcomeIllustrationViewBottomAnchorLayoutConstraint: NSLayoutConstraint?
    private(set) lazy var dismissBarButtonItem = UIBarButtonItem(barButtonSystemItem: .close, target: self, action: #selector(WelcomeViewController.dismissBarButtonItemDidPressed(_:)))
    private(set) lazy var logoImageView: UIImageView = {
        let image = view.traitCollection.userInterfaceIdiom == .phone ? Asset.Scene.Welcome.mastodonLogo.image : Asset.Scene.Welcome.mastodonLogoBlackLarge.image
        let imageView = UIImageView(image: image)
@ -90,6 +96,14 @@ extension WelcomeViewController {
        signUpButton.addTarget(self, action: #selector(signUpButtonDidClicked(_:)), for: .touchUpInside)
        signInButton.addTarget(self, action: #selector(signInButtonDidClicked(_:)), for: .touchUpInside)
        viewModel.needsShowDismissEntry
            .receive(on: DispatchQueue.main)
            .sink { [weak self] needsShowDismissEntry in
                guard let self = self else { return }
                self.navigationItem.leftBarButtonItem = needsShowDismissEntry ? self.dismissBarButtonItem : nil
            }
            .store(in: &disposeBag)
    }
    override func viewSafeAreaInsetsDidChange() {
@ -213,6 +227,11 @@ extension WelcomeViewController {
    private func signInButtonDidClicked(_ sender: UIButton) {
        coordinator.present(scene: .mastodonPickServer(viewMode: MastodonPickServerViewModel(context: context, mode: .signIn)), from: self, transition: .show)
    }
    @objc
    private func dismissBarButtonItemDidPressed(_ sender: UIButton) {
        dismiss(animated: true, completion: nil)
    }
 }
 // MARK: - OnboardingViewControllerAppearance
--- a/Mastodon/Scene/Onboarding/Welcome/WelcomeViewModel.swift
+++ b/Mastodon/Scene/Onboarding/Welcome/WelcomeViewModel.swift
@ -0,0 +1,30 @@
 //
 //  WelcomeViewModel.swift
 //  Mastodon
 //
 //  Created by Cirno MainasuK on 2021-9-15.
 //
 import Foundation
 import Combine
 final class WelcomeViewModel {
    var disposeBag = Set<AnyCancellable>()
    // input
    let context: AppContext
    // output
    let needsShowDismissEntry = CurrentValueSubject<Bool, Never>(false)
    init(context: AppContext) {
        self.context = context
        context.authenticationService.mastodonAuthentications
            .map { !$0.isEmpty }
            .assign(to: \.value, on: needsShowDismissEntry)
            .store(in: &disposeBag)
    }
 }
--- a/Mastodon/Scene/Share/View/Button/AvatarButton.swift
+++ b/Mastodon/Scene/Share/View/Button/AvatarButton.swift
@ -28,6 +28,7 @@ class AvatarButton: UIControl {
    }
    func _init() {
        avatarImageView.frame = bounds
        avatarImageView.translatesAutoresizingMaskIntoConstraints = false
        addSubview(avatarImageView)
        NSLayoutConstraint.activate([
--- a/Mastodon/Scene/Share/View/Button/CircleAvatarButton.swift
+++ b/Mastodon/Scene/Share/View/Button/CircleAvatarButton.swift
@ -0,0 +1,20 @@
 //
 //  CircleAvatarButton.swift
 //  Mastodon
 //
 //  Created by Cirno MainasuK on 2021-9-15.
 //
 import UIKit
 final class CircleAvatarButton: AvatarButton {
    override func layoutSubviews() {
        super.layoutSubviews()
        layer.masksToBounds = true
        layer.cornerRadius = frame.width * 0.5
        layer.borderColor = UIColor.systemFill.cgColor
        layer.borderWidth = 1
    }
 }
--- a/Mastodon/Scene/Share/View/Node/Status/StatusNode.swift
+++ b/Mastodon/Scene/Share/View/Node/Status/StatusNode.swift
@ -121,7 +121,7 @@ final class StatusNode: ASCellNode {
 //        }
        for imageNode in mediaMultiplexImageNodes {
-            imageNode.dataSource = self
+            imageNode.delegate = self
        }
    }
--- a/Podfile.lock
+++ b/Podfile.lock
@ -80,4 +80,4 @@ SPEC CHECKSUMS:
 PODFILE CHECKSUM: 4db0bdf969729c5758bd923e33d9e097cb892086
-COCOAPODS: 1.10.2
+COCOAPODS: 1.11.0
--- a/README.md
+++ b/README.md
@ -70,6 +70,7 @@ The app is compatible with [toot-relay](https://github.com/DagAgren/toot-relay)
 - [Nuke-FLAnimatedImage-Plugin](https://github.com/kean/Nuke-FLAnimatedImage-Plugin)
 - [Nuke](https://github.com/kean/Nuke)
 - [Pageboy](https://github.com/uias/Pageboy#the-basics)
 - [PanModal](https://github.com/slackhq/PanModal.git)
 - [SDWebImage](https://github.com/SDWebImage/SDWebImage)
 - [swift-collections](https://github.com/apple/swift-collections)
 - [swift-nio](https://github.com/apple/swift-nio)
`@ -80,4 +80,4 @@ SPEC CHECKSUMS:`

	`PODFILE CHECKSUM: 4db0bdf969729c5758bd923e33d9e097cb892086`	`PODFILE CHECKSUM: 4db0bdf969729c5758bd923e33d9e097cb892086`

	`COCOAPODS: 1.10.2`	`COCOAPODS: 1.11.0`