Create AppCoordinator to handle navigation at root level.

Riot/Modules/Application/AppCoordinator.swift

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+/*
+ Copyright 2020 New Vector Ltd
+ 
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+ 
+ http://www.apache.org/licenses/LICENSE-2.0
+ 
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+ */
+
+import Foundation
+import Intents
+
+final class AppCoordinator: NSObject, AppCoordinatorType {
+    
+    // MARK: - Constants
+    
+    // MARK: - Properties
+  
+    // MARK: Private
+    
+    private let rootRouter: RootRouterType
+    
+    private weak var splitViewCoordinator: SplitViewCoordinatorType?
+    
+    // TODO: Use a dedicated class to handle Matrix sessions
+    /// Main user Matrix session
+    private var mainSession: MXSession? {
+        return MXKAccountManager.shared().activeAccounts.first?.mxSession
+    }
+  
+    // MARK: Public
+    
+    var childCoordinators: [Coordinator] = []
+    
+    // MARK: - Setup
+    
+    init(router: RootRouterType) {
+        self.rootRouter = router
+    }
+    
+    // MARK: - Public methods
+    
+    func start() {
+        self.showSplitView(session: self.mainSession)
+    }
+        
+    // MARK: - Private methods
+    
+    private func showLogin() {
+        // TODO: Implement
+    }
+    
+    private func showLoading() {
+        // TODO: Implement
+    }
+    
+    private func showPinCode() {
+        // TODO: Implement
+    }
+    
+    private func showSplitView(session: MXSession?) {
+        let splitViewCoordinator = SplitViewCoordinator(router: self.rootRouter, session: session)
+        splitViewCoordinator.start()
+        self.add(childCoordinator: splitViewCoordinator)
+        self.splitViewCoordinator = splitViewCoordinator
+    }
+    
+    private func checkAppVersion() {
+        // TODO: Implement
+    }
+    
+    private func showError(_ error: Error) {
+        // FIXME: Present an error on coordinator.toPresentable()
+        AppDelegate.theDelegate().showError(asAlert: error)
+    }
+}
+
+// MARK: - LegacyAppDelegateDelegate
+extension AppCoordinator: LegacyAppDelegateDelegate {
+            
+    func legacyAppDelegate(_ legacyAppDelegate: LegacyAppDelegate!, wantsToPopToHomeViewControllerAnimated animated: Bool, completion: (() -> Void)!) {
+        
+        self.splitViewCoordinator?.popToHome(animated: animated, completion: completion)
+    }
+    
+    func legacyAppDelegateRestoreEmptyDetailsViewController(_ legacyAppDelegate: LegacyAppDelegate!) {
+        self.splitViewCoordinator?.restorePlaceholderDetails()
+    }
+}

Riot/Modules/Application/AppCoordinatorType.swift

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+/*
+ Copyright 2020 New Vector Ltd
+ 
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+ 
+ http://www.apache.org/licenses/LICENSE-2.0
+ 
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+ */
+
+import Foundation
+
+/// `AppCoordinatorType` is a protocol describing a Coordinator that handle application navigation flow.
+protocol AppCoordinatorType: Coordinator {
+}