Refresh

ServiceLayer/Sources/ServiceLayer/Services/AccountListService.swift

@@ -10,6 +10,7 @@ public struct AccountListService {
     public let sections: AnyPublisher<[[CollectionItem]], Error>
     public let nextPageMaxId: AnyPublisher<String, Never>
     public let navigationService: NavigationService
+    public let canRefresh = false
 
     private let accountList = CurrentValueSubject<[Account], Error>([])
     private let endpoint: AccountsEndpoint

ServiceLayer/Sources/ServiceLayer/Services/CollectionService.swift

@@ -7,6 +7,7 @@ public protocol CollectionService {
     var sections: AnyPublisher<[[CollectionItem]], Error> { get }
     var nextPageMaxId: AnyPublisher<String, Never> { get }
     var preferLastPresentIdOverNextPageMaxId: Bool { get }
+    var canRefresh: Bool { get }
     var title: AnyPublisher<String, Never> { get }
     var titleLocalizationComponents: AnyPublisher<[String], Never> { get }
     var navigationService: NavigationService { get }
@@ -19,6 +20,8 @@ extension CollectionService {
 
     public var preferLastPresentIdOverNextPageMaxId: Bool { false }
 
+    public var canRefresh: Bool { true }
+
     public var title: AnyPublisher<String, Never> { Empty().eraseToAnyPublisher() }
 
     public var titleLocalizationComponents: AnyPublisher<[String], Never> { Empty().eraseToAnyPublisher() }

View Controllers/TableViewController.swift

@@ -47,6 +47,14 @@ class TableViewController: UITableViewController {
         tableView.tableFooterView = UIView()
         tableView.contentInset.bottom = Self.bottomInset
 
+        if viewModel.canRefresh {
+            refreshControl = UIRefreshControl()
+            refreshControl?.addAction(
+                UIAction { [weak self] _ in
+                    self?.viewModel.request(maxId: nil, minId: nil) },
+                for: .valueChanged)
+        }
+
         view.addSubview(webfingerIndicatorView)
         webfingerIndicatorView.translatesAutoresizingMaskIntoConstraints = false
 
@@ -208,6 +216,7 @@ extension TableViewController: ZoomAnimatorDelegate {
 
 private extension TableViewController {
     static let bottomInset: CGFloat = .newStatusButtonDimension + .defaultSpacing * 4
+    static let loadingFooterDebounceInterval: TimeInterval = 0.5
 
     var visibleLoadMoreViews: [LoadMoreView] {
         tableView.visibleCells.compactMap { $0.contentView as? LoadMoreView }
@@ -237,13 +246,22 @@ private extension TableViewController {
 
         viewModel.loading.receive(on: DispatchQueue.main).assign(to: &$loading)
 
-        $loading.sink { [weak self] in
-            guard let self = self else { return }
+        $loading.debounce(
+            for: .seconds(Self.loadingFooterDebounceInterval),
+            scheduler: DispatchQueue.main)
+            .sink { [weak self] in
+                guard let self = self else { return }
 
-            self.tableView.tableFooterView = $0 ? self.loadingTableFooterView : UIView()
-            self.sizeTableHeaderFooterViews()
-        }
-        .store(in: &cancellables)
+                if !$0 {
+                    self.refreshControl?.endRefreshing()
+                }
+
+                let refreshControlVisibile = self.refreshControl?.isRefreshing ?? false
+
+                self.tableView.tableFooterView = $0 && !refreshControlVisibile ? self.loadingTableFooterView : UIView()
+                self.sizeTableHeaderFooterViews()
+            }
+            .store(in: &cancellables)
 
         viewModel.alertItems
             .compactMap { $0 }

ViewModels/Sources/ViewModels/CollectionItemsViewModel.swift

@@ -84,6 +84,8 @@ extension CollectionItemsViewModel: CollectionViewModel {
 
     public var preferLastPresentIdOverNextPageMaxId: Bool { collectionService.preferLastPresentIdOverNextPageMaxId }
 
+    public var canRefresh: Bool { collectionService.canRefresh }
+
     public func request(maxId: String? = nil, minId: String? = nil) {
         let publisher: AnyPublisher<Never, Error>
 

ViewModels/Sources/ViewModels/CollectionViewModel.swift

@@ -14,6 +14,7 @@ public protocol CollectionViewModel {
     var shouldAdjustContentInset: Bool { get }
     var nextPageMaxId: String? { get }
     var preferLastPresentIdOverNextPageMaxId: Bool { get }
+    var canRefresh: Bool { get }
     func request(maxId: String?, minId: String?)
     func viewedAtTop(indexPath: IndexPath)
     func select(indexPath: IndexPath)

ViewModels/Sources/ViewModels/ProfileViewModel.swift

@@ -107,6 +107,8 @@ extension ProfileViewModel: CollectionViewModel {
         collectionViewModel.value.preferLastPresentIdOverNextPageMaxId
     }
 
+    public var canRefresh: Bool { collectionViewModel.value.canRefresh }
+
     public func request(maxId: String?, minId: String?) {
         if case .statuses = collection, maxId == nil {
             profileService.fetchPinnedStatuses()

Views/LoadingTableFooterView.swift

@@ -10,6 +10,7 @@ final class LoadingTableFooterView: UIView {
 
         addSubview(activityIndicatorView)
         activityIndicatorView.translatesAutoresizingMaskIntoConstraints = false
+        activityIndicatorView.style = .large
 
         NSLayoutConstraint.activate([
             activityIndicatorView.centerXAnchor.constraint(equalTo: centerXAnchor),