Refactor tab/MainTabBarController to add viewcontrollers as properties

This is a WIP-step for account-stuff. Also: iPhone only, iPad should come next

Mastodon.xcodeproj/project.pbxproj

@@ -166,6 +166,7 @@
 		D8B5E4F22A4EBCF90008970C /* NotificationSettings.swift in Sources */ = {isa = PBXBuildFile; fileRef = D8B5E4F12A4EBCF90008970C /* NotificationSettings.swift */; };
 		D8B5E4F42A4ED0240008970C /* NotificationSettingsViewModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = D8B5E4F32A4ED0240008970C /* NotificationSettingsViewModel.swift */; };
 		D8BE30B32A179E26006B8270 /* SuggestionAccountTableViewFooter.swift in Sources */ = {isa = PBXBuildFile; fileRef = D8BE30B22A179E26006B8270 /* SuggestionAccountTableViewFooter.swift */; };
+		D8CF45832B50893900C84D70 /* Tab.swift in Sources */ = {isa = PBXBuildFile; fileRef = D8CF45822B50893900C84D70 /* Tab.swift */; };
 		D8D688F62AB869CB000F651A /* SearchResultsProfileTableViewCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = D8D688F52AB869CB000F651A /* SearchResultsProfileTableViewCell.swift */; };
 		D8D688F92AB8B970000F651A /* SearchResultOverviewCoordinator.swift in Sources */ = {isa = PBXBuildFile; fileRef = D8D688F82AB8B970000F651A /* SearchResultOverviewCoordinator.swift */; };
 		D8E5C346296DAB84007E76A7 /* DataSourceFacade+Status+History.swift in Sources */ = {isa = PBXBuildFile; fileRef = D8E5C345296DAB84007E76A7 /* DataSourceFacade+Status+History.swift */; };
@@ -833,6 +834,7 @@
 		D8B5E4F12A4EBCF90008970C /* NotificationSettings.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NotificationSettings.swift; sourceTree = "<group>"; };
 		D8B5E4F32A4ED0240008970C /* NotificationSettingsViewModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NotificationSettingsViewModel.swift; sourceTree = "<group>"; };
 		D8BE30B22A179E26006B8270 /* SuggestionAccountTableViewFooter.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SuggestionAccountTableViewFooter.swift; sourceTree = "<group>"; };
+		D8CF45822B50893900C84D70 /* Tab.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Tab.swift; sourceTree = "<group>"; };
 		D8D688F52AB869CB000F651A /* SearchResultsProfileTableViewCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SearchResultsProfileTableViewCell.swift; sourceTree = "<group>"; };
 		D8D688F82AB8B970000F651A /* SearchResultOverviewCoordinator.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SearchResultOverviewCoordinator.swift; sourceTree = "<group>"; };
 		D8E5C345296DAB84007E76A7 /* DataSourceFacade+Status+History.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "DataSourceFacade+Status+History.swift"; sourceTree = "<group>"; };
@@ -2557,6 +2559,7 @@
 				DB03A794272A981400EE37C5 /* ContentSplitViewController.swift */,
 				DB852D1A26FAED0100FC9D81 /* Sidebar */,
 				DB8AF54E25C13703002E6C99 /* MainTab */,
+				D8CF45822B50893900C84D70 /* Tab.swift */,
 			);
 			path = Root;
 			sourceTree = "<group>";
@@ -3970,6 +3973,7 @@
 				2A3F6FE5292F6E44002E6DA7 /* FollowedTagsTableViewCell.swift in Sources */,
 				C24C97032922F30500BAE8CB /* RefreshControl.swift in Sources */,
 				DB023D2A27A0FE5C005AC798 /* DataSourceProvider+NotificationTableViewCellDelegate.swift in Sources */,
+				D8CF45832B50893900C84D70 /* Tab.swift in Sources */,
 				D8363B1629469CE200A74079 /* OnboardingNextView.swift in Sources */,
 				DB98EB6027B10E150082E365 /* ReportCommentTableViewCell.swift in Sources */,
 				DB0FCB962797E6C2006C02E2 /* SearchResultViewController+DataSourceProvider.swift in Sources */,

Mastodon/Coordinator/SceneCoordinator.swift

@@ -387,7 +387,7 @@ extension SceneCoordinator {
         return viewController
     }
 
-    func switchToTabBar(tab: MainTabBarController.Tab) {
+    func switchToTabBar(tab: Tab) {
         splitViewController?.contentSplitViewController.currentSupplementaryTab = tab
         
         splitViewController?.compactMainTabBarViewController.selectedIndex = tab.rawValue

Mastodon/Scene/Root/ContentSplitViewController.swift

@@ -11,8 +11,8 @@ import CoreDataStack
 import MastodonCore
 
 protocol ContentSplitViewControllerDelegate: AnyObject {
-    func contentSplitViewController(_ contentSplitViewController: ContentSplitViewController, sidebarViewController: SidebarViewController, didSelectTab tab: MainTabBarController.Tab)
+    func contentSplitViewController(_ contentSplitViewController: ContentSplitViewController, sidebarViewController: SidebarViewController, didSelectTab tab: Tab)
-    func contentSplitViewController(_ contentSplitViewController: ContentSplitViewController, sidebarViewController: SidebarViewController, didDoubleTapTab tab: MainTabBarController.Tab)
+    func contentSplitViewController(_ contentSplitViewController: ContentSplitViewController, sidebarViewController: SidebarViewController, didDoubleTapTab tab: Tab)
 }
 
 final class ContentSplitViewController: UIViewController, NeedsDependency {
@@ -37,7 +37,7 @@ final class ContentSplitViewController: UIViewController, NeedsDependency {
         return sidebarViewController
     }()
     
-    @Published var currentSupplementaryTab: MainTabBarController.Tab = .home
+    @Published var currentSupplementaryTab: Tab = .home
     private(set) lazy var mainTabBarController: MainTabBarController = {
         let mainTabBarController = MainTabBarController(context: context, coordinator: coordinator, authContext: authContext)
         if let homeTimelineViewController = mainTabBarController.viewController(of: HomeTimelineViewController.self) {
@@ -102,7 +102,7 @@ extension ContentSplitViewController {
 // MARK: - SidebarViewControllerDelegate
 extension ContentSplitViewController: SidebarViewControllerDelegate {
     
-    func sidebarViewController(_ sidebarViewController: SidebarViewController, didSelectTab tab: MainTabBarController.Tab) {
+    func sidebarViewController(_ sidebarViewController: SidebarViewController, didSelectTab tab: Tab) {
         delegate?.contentSplitViewController(self, sidebarViewController: sidebarViewController, didSelectTab: tab)
     }
     

Mastodon/Scene/Root/MainTab/MainTabBarController.swift

@@ -34,102 +34,13 @@ class MainTabBarController: UITabBarController {
     )
     
     @Published var currentTab: Tab = .home
-        
-    enum Tab: Int, CaseIterable {
-        case home
-        case search
-        case compose
-        case notifications
-        case me
 
-        var tag: Int {
+    let homeTimelineViewController: HomeTimelineViewController
-            return rawValue
+    let searchViewController: SearchViewController
-        }
+    let composeViewController: UIViewController // placeholder
-        
+    let notificationViewController: NotificationViewController
-        var title: String {
+    let meProfileViewController: ProfileViewController
-            switch self {
-            case .home:             return L10n.Common.Controls.Tabs.home
-            case .search:           return L10n.Common.Controls.Tabs.searchAndExplore
-            case .compose:          return L10n.Common.Controls.Actions.compose
-            case .notifications:    return L10n.Common.Controls.Tabs.notifications
-            case .me:               return L10n.Common.Controls.Tabs.profile
-            }
-        }
 
-        var inputLabels: [String]? {
-            switch self {
-            case .home, .compose, .notifications, .me:
-                return nil
-            case .search:
-                return [
-                    L10n.Common.Controls.Tabs.A11Y.search,
-                    L10n.Common.Controls.Tabs.A11Y.explore,
-                    L10n.Common.Controls.Tabs.searchAndExplore
-                ]
-            }
-        }
-        
-        var image: UIImage {
-            switch self {
-                case .home:             return UIImage(systemName: "house")!
-                case .search:           return UIImage(systemName: "magnifyingglass")!
-                case .compose:          return UIImage(systemName: "square.and.pencil")!
-                case .notifications:    return UIImage(systemName: "bell")!
-                case .me:               return UIImage(systemName: "person")!
-            }
-        }
-        
-        var selectedImage: UIImage {
-            return image.withTintColor(Asset.Colors.Brand.blurple.color, renderingMode: .alwaysOriginal)
-        }
-
-        var largeImage: UIImage {
-            return image.withRenderingMode(.alwaysTemplate).resized(size: CGSize(width: 80, height: 80))
-        }
-
-        @MainActor
-        func viewController(context: AppContext, authContext: AuthContext?, coordinator: SceneCoordinator) -> UIViewController {
-            guard let authContext else { return UITableViewController() }
-
-            let viewController: UIViewController
-            switch self {
-            case .home:
-                let _viewController = HomeTimelineViewController()
-                _viewController.context = context
-                _viewController.coordinator = coordinator
-                _viewController.viewModel = HomeTimelineViewModel(context: context, authContext: authContext)
-                viewController = _viewController
-            case .search:
-                let _viewController = SearchViewController()
-                _viewController.context = context
-                _viewController.coordinator = coordinator
-                _viewController.viewModel = .init(context: context, authContext: authContext)
-                viewController = _viewController
-            case .compose:
-                viewController = UIViewController()
-            case .notifications:
-                let _viewController = NotificationViewController()
-                _viewController.context = context
-                _viewController.coordinator = coordinator
-                _viewController.viewModel = .init(context: context, authContext: authContext)
-                viewController = _viewController
-            case .me:
-                #warning("What happens if there's no me at the beginning? I guess we _do_ need another migration?")
-                guard let me = authContext.mastodonAuthenticationBox.authentication.account() else { return UIViewController() }
-                
-                let _viewController = ProfileViewController()
-                _viewController.context = context
-                _viewController.coordinator = coordinator
-                _viewController.viewModel = ProfileViewModel(context: context, authContext: authContext, account: me, relationship: nil, me: me)
-                viewController = _viewController
-            }
-            viewController.title = self.title
-            return AdaptiveStatusBarStyleNavigationController(rootViewController: viewController)
-        }
-    }
-    
-    var _viewControllers: [UIViewController] = []
-    
     private(set) var isReadyForWizardAvatarButton = false
     
     // output
@@ -146,15 +57,43 @@ class MainTabBarController: UITabBarController {
         self.context = context
         self.coordinator = coordinator
         self.authContext = authContext
+
+        homeTimelineViewController = HomeTimelineViewController()
+        homeTimelineViewController.configureTabBarItem(with: .home)
+        homeTimelineViewController.context = context
+        homeTimelineViewController.coordinator = coordinator
+
+        searchViewController = SearchViewController()
+        searchViewController.configureTabBarItem(with: .search)
+        searchViewController.context = context
+        searchViewController.coordinator = coordinator
+
+        composeViewController = UIViewController()
+        composeViewController.configureTabBarItem(with: .compose)
+
+        notificationViewController = NotificationViewController()
+        notificationViewController.configureTabBarItem(with: .notifications)
+        notificationViewController.context = context
+        notificationViewController.coordinator = coordinator
+
+        meProfileViewController = ProfileViewController()
+        meProfileViewController.context = context
+        meProfileViewController.coordinator = coordinator
+        meProfileViewController.configureTabBarItem(with: .me)
+
+        if let authContext {
+            notificationViewController.viewModel = NotificationViewModel(context: context, authContext: authContext)
+            homeTimelineViewController.viewModel = HomeTimelineViewModel(context: context, authContext: authContext)
+            searchViewController.viewModel = SearchViewModel(context: context, authContext: authContext)
+        }
+
         super.init(nibName: nil, bundle: nil)
+
+        viewControllers = [homeTimelineViewController, searchViewController, composeViewController, notificationViewController, meProfileViewController].map { AdaptiveStatusBarStyleNavigationController(rootViewController: $0) }
         tabBar.addInteraction(largeContentViewerInteraction)
-        
-    }
-    
-    required init?(coder: NSCoder) {
-        fatalError("init(coder:) has not been implemented")
     }
     
+    required init?(coder: NSCoder) { fatalError("init(coder:) has not been implemented") }
 }
 
 extension MainTabBarController {
@@ -171,26 +110,9 @@ extension MainTabBarController {
         view.backgroundColor = .systemBackground
 
         // seealso: `ThemeService.apply(theme:)`
-        let tabs = Tab.allCases
-        var viewControllers = [UIViewController]()
-        
-        for tab in tabs {
-            let viewController = tab.viewController(context: context, authContext: authContext, coordinator: coordinator)
-            viewController.tabBarItem.tag = tab.tag
-            viewController.tabBarItem.title = tab.title     // needs for acessiblity large content label
-            viewController.tabBarItem.image = tab.image.imageWithoutBaseline()
-            viewController.tabBarItem.largeContentSizeImage = tab.largeImage.imageWithoutBaseline()
-            viewController.tabBarItem.accessibilityLabel = tab.title
-            viewController.tabBarItem.accessibilityUserInputLabels = tab.inputLabels
-            viewController.tabBarItem.imageInsets = UIEdgeInsets(top: 6, left: 0, bottom: -6, right: 0)
-            viewControllers.append(viewController)
-        }
-        
-        _viewControllers = viewControllers
         setViewControllers(viewControllers, animated: false)
         selectedIndex = 0
         
-        
         // hacky workaround for FB11986255 (Setting accessibilityUserInputLabels on a UITabBarItem has no effect)
         DispatchQueue.main.asyncAfter(deadline: .now() + .milliseconds(50)) {
             if let searchItem = self.tabBar.subviews.first(where: { $0.accessibilityLabel == Tab.search.title }) {
@@ -201,7 +123,7 @@ extension MainTabBarController {
         context.apiService.error
             .receive(on: DispatchQueue.main)
             .sink { [weak self] error in
-                guard let self = self, let coordinator = self.coordinator else { return }
+                guard let self, let coordinator = self.coordinator else { return }
                 switch error {
                     case .implicit:
                         break
@@ -228,15 +150,14 @@ extension MainTabBarController {
         )
         .receive(on: DispatchQueue.main)
         .sink { [weak self] authentication, currentTab in
-            guard let self = self else { return }
+            guard let self else { return }
-            guard let notificationViewController = self.notificationViewController else { return }
+
-            
             let authentication = self.authContext?.mastodonAuthenticationBox.userAuthorization
             let hasUnreadPushNotification: Bool = authentication.flatMap { authentication in
                 let count = UserDefaults.shared.getNotificationCountWithAccessToken(accessToken: authentication.accessToken)
                 return count > 0
             } ?? false
-            
+
             let image: UIImage
             if hasUnreadPushNotification {
                 let imageConfiguration = UIImage.SymbolConfiguration(paletteColors: [.red, SystemTheme.tabBarItemNormalIconColor])
@@ -244,17 +165,18 @@ extension MainTabBarController {
             } else {
                 image = Tab.notifications.image
             }
-            
+
             notificationViewController.tabBarItem.image = image.imageWithoutBaseline()
             notificationViewController.navigationController?.tabBarItem.image = image.imageWithoutBaseline()
         }
         .store(in: &disposeBag)
+
         layoutAvatarButton()
-        
+
         $avatarURL
             .receive(on: DispatchQueue.main)
             .sink { [weak self] avatarURL in
-                guard let self = self else { return }
+                guard let self else { return }
                 self.avatarButton.avatarImageView.setImage(
                     url: avatarURL,
                     placeholder: .placeholder(color: .systemFill),
@@ -262,7 +184,7 @@ extension MainTabBarController {
                 )
             }
             .store(in: &disposeBag)
-        
+
         NotificationCenter.default.publisher(for: .userFetched)
             .receive(on: DispatchQueue.main)
             .sink { [weak self] _ in
@@ -300,11 +222,11 @@ extension MainTabBarController {
         $currentTab
             .receive(on: DispatchQueue.main)
             .sink { [weak self] tab in
-                guard let self = self else { return }
+                guard let self else { return }
                 self.updateAvatarButtonAppearance()
             }
             .store(in: &disposeBag)
-        
+
         updateTabBarDisplay()
     }
     
@@ -358,7 +280,7 @@ extension MainTabBarController {
         case .search:
             assert(Thread.isMainThread)
             // double tapping search tab opens the search bar without additional taps
-            searchViewController?.searchBar.becomeFirstResponder()
+            searchViewController.searchBar.becomeFirstResponder()
         default:
             break
         }
@@ -460,18 +382,6 @@ extension MainTabBarController {
     }
 }
 
-extension MainTabBarController {
-
-    var notificationViewController: NotificationViewController? {
-        return viewController(of: NotificationViewController.self)
-    }
-    
-    var searchViewController: SearchViewController? {
-        return viewController(of: SearchViewController.self)
-    }
-    
-}
-
 // MARK: - UITabBarControllerDelegate
 extension MainTabBarController: UITabBarControllerDelegate {
     func tabBarController(_ tabBarController: UITabBarController, shouldSelect viewController: UIViewController) -> Bool {

Mastodon/Scene/Root/RootSplitViewController.swift

@@ -127,8 +127,8 @@ extension RootSplitViewController {
 
 // MARK: - ContentSplitViewControllerDelegate
 extension RootSplitViewController: ContentSplitViewControllerDelegate {
-    func contentSplitViewController(_ contentSplitViewController: ContentSplitViewController, sidebarViewController: SidebarViewController, didSelectTab tab: MainTabBarController.Tab) {
+    func contentSplitViewController(_ contentSplitViewController: ContentSplitViewController, sidebarViewController: SidebarViewController, didSelectTab tab: Tab) {
-        guard let _ = MainTabBarController.Tab.allCases.firstIndex(of: tab) else {
+        guard let _ = Tab.allCases.firstIndex(of: tab) else {
             assertionFailure()
             return
         }
@@ -158,8 +158,8 @@ extension RootSplitViewController: ContentSplitViewControllerDelegate {
         }
     }
     
-    func contentSplitViewController(_ contentSplitViewController: ContentSplitViewController, sidebarViewController: SidebarViewController, didDoubleTapTab tab: MainTabBarController.Tab) {
+    func contentSplitViewController(_ contentSplitViewController: ContentSplitViewController, sidebarViewController: SidebarViewController, didDoubleTapTab tab: Tab) {
-        guard let _ = MainTabBarController.Tab.allCases.firstIndex(of: tab) else {
+        guard let _ = Tab.allCases.firstIndex(of: tab) else {
             assertionFailure()
             return
         }
@@ -170,7 +170,7 @@ extension RootSplitViewController: ContentSplitViewControllerDelegate {
             guard !isPrimaryDisplay else {
                 return
             }
-            contentSplitViewController.mainTabBarController.searchViewController?.searchBar.becomeFirstResponder()
+            contentSplitViewController.mainTabBarController.searchViewController.searchBar.becomeFirstResponder()
         default:
             break
         }

Mastodon/Scene/Root/Sidebar/SidebarViewController.swift

@@ -12,7 +12,7 @@ import MastodonCore
 import MastodonUI
 
 protocol SidebarViewControllerDelegate: AnyObject {
-    func sidebarViewController(_ sidebarViewController: SidebarViewController, didSelectTab tab: MainTabBarController.Tab)
+    func sidebarViewController(_ sidebarViewController: SidebarViewController, didSelectTab tab: Tab)
     func sidebarViewController(_ sidebarViewController: SidebarViewController, didLongPressItem item: SidebarViewModel.Item, sourceView: UIView)
     func sidebarViewController(_ sidebarViewController: SidebarViewController, didDoubleTapItem item: SidebarViewModel.Item, sourceView: UIView)
 }

Mastodon/Scene/Root/Sidebar/SidebarViewModel.swift

@@ -23,7 +23,7 @@ final class SidebarViewModel {
     let authContext: AuthContext?
     @Published private var isSidebarDataSourceReady = false
     @Published private var isAvatarButtonDataReady = false
-    @Published var currentTab: MainTabBarController.Tab = .home
+    @Published var currentTab: Tab = .home
 
     // output
     var diffableDataSource: UICollectionViewDiffableDataSource<Section, Item>?
@@ -57,7 +57,7 @@ extension SidebarViewModel {
     }
     
     enum Item: Hashable {
-        case tab(MainTabBarController.Tab)
+        case tab(Tab)
         case setting
         case compose
     }
@@ -69,7 +69,7 @@ extension SidebarViewModel {
         collectionView: UICollectionView,
         secondaryCollectionView: UICollectionView
     ) {
-        let tabCellRegistration = UICollectionView.CellRegistration<SidebarListCollectionViewCell, MainTabBarController.Tab> { [weak self] cell, indexPath, item in
+        let tabCellRegistration = UICollectionView.CellRegistration<SidebarListCollectionViewCell, Tab> { [weak self] cell, indexPath, item in
             guard let self else { return }
 
             let imageURL: URL?
@@ -125,7 +125,7 @@ extension SidebarViewModel {
                             let imageConfiguration = UIImage.SymbolConfiguration(paletteColors: [.red, SystemTheme.tabBarItemNormalIconColor])
                             image = UIImage(systemName: "bell.badge", withConfiguration: imageConfiguration)!
                         } else {
-                            image = MainTabBarController.Tab.notifications.image
+                            image = Tab.notifications.image
                         }
                         cell.item?.image = image
                         cell.item?.activeImage = image.withTintColor(Asset.Colors.Brand.blurple.color, renderingMode: .alwaysOriginal)

Mastodon/Scene/Root/Tab.swift

@@ -0,0 +1,111 @@
+// Copyright © 2024 Mastodon gGmbH. All rights reserved.
+
+import UIKit
+import MastodonLocalization
+import MastodonAsset
+
+enum Tab: Int, CaseIterable {
+    case home
+    case search
+    case compose
+    case notifications
+    case me
+
+    var tag: Int {
+        return rawValue
+    }
+
+    var title: String {
+        switch self {
+        case .home:             return L10n.Common.Controls.Tabs.home
+        case .search:           return L10n.Common.Controls.Tabs.searchAndExplore
+        case .compose:          return L10n.Common.Controls.Actions.compose
+        case .notifications:    return L10n.Common.Controls.Tabs.notifications
+        case .me:               return L10n.Common.Controls.Tabs.profile
+        }
+    }
+
+    var inputLabels: [String]? {
+        switch self {
+        case .home, .compose, .notifications, .me:
+            return nil
+        case .search:
+            return [
+                L10n.Common.Controls.Tabs.A11Y.search,
+                L10n.Common.Controls.Tabs.A11Y.explore,
+                L10n.Common.Controls.Tabs.searchAndExplore
+            ]
+        }
+    }
+
+    var image: UIImage {
+        switch self {
+            case .home:             return UIImage(systemName: "house")!
+            case .search:           return UIImage(systemName: "magnifyingglass")!
+            case .compose:          return UIImage(systemName: "square.and.pencil")!
+            case .notifications:    return UIImage(systemName: "bell")!
+            case .me:               return UIImage(systemName: "person")!
+        }
+    }
+
+    var selectedImage: UIImage {
+        return image.withTintColor(Asset.Colors.Brand.blurple.color, renderingMode: .alwaysOriginal)
+    }
+
+    var largeImage: UIImage {
+        return image.withRenderingMode(.alwaysTemplate).resized(size: CGSize(width: 80, height: 80))
+    }
+
+//    @MainActor
+//    func viewController(context: AppContext, authContext: AuthContext?, coordinator: SceneCoordinator) -> UIViewController {
+//        guard let authContext else { return UITableViewController() }
+//
+//        let viewController: UIViewController
+//        switch self {
+//        case .home:
+//            let _viewController = HomeTimelineViewController()
+//            _viewController.context = context
+//            _viewController.coordinator = coordinator
+//            _viewController.viewModel = HomeTimelineViewModel(context: context, authContext: authContext)
+//            viewController = _viewController
+//        case .search:
+//            let _viewController = SearchViewController()
+//            _viewController.context = context
+//            _viewController.coordinator = coordinator
+//            _viewController.viewModel = SearchViewModel(context: context, authContext: authContext)
+//            viewController = _viewController
+//        case .compose:
+//            viewController = UIViewController()
+//        case .notifications:
+//            let _viewController = NotificationViewController()
+//            _viewController.context = context
+//            _viewController.coordinator = coordinator
+//            _viewController.viewModel = NotificationViewModel(context: context, authContext: authContext)
+//            viewController = _viewController
+//        case .me:
+//            #warning("What happens if there's no me at the beginning? I guess we _do_ need another migration?")
+//            guard let me = authContext.mastodonAuthenticationBox.authentication.account() else { return UIViewController() }
+//
+//            let _viewController = ProfileViewController()
+//            _viewController.context = context
+//            _viewController.coordinator = coordinator
+//            _viewController.viewModel = ProfileViewModel(context: context, authContext: authContext, account: me, relationship: nil, me: me)
+//            viewController = _viewController
+//        }
+//        viewController.title = self.title
+//        return AdaptiveStatusBarStyleNavigationController(rootViewController: viewController)
+//    }
+}
+
+extension UIViewController {
+    func configureTabBarItem(with tab: Tab) {
+        title = tab.title
+        tabBarItem.tag = tab.tag
+        tabBarItem.title = tab.title     // needs for acessiblity large content label
+        tabBarItem.image = tab.image.imageWithoutBaseline()
+        tabBarItem.largeContentSizeImage = tab.largeImage.imageWithoutBaseline()
+        tabBarItem.accessibilityLabel = tab.title
+        tabBarItem.accessibilityUserInputLabels = tab.inputLabels
+        tabBarItem.imageInsets = UIEdgeInsets(top: 6, left: 0, bottom: -6, right: 0)
+    }
+}