How do I configure scene-based lifecycle on iOS using Swift?

Configuring a scene-based lifecycle in iOS using Swift is essential to manage multiple windows in your app, especially when targeting multi-window support on iPad. Here's a guide on how to implement it correctly.

Getting Started with Scene-based Lifecycle

First, ensure your project supports the scene lifecycle by checking the Info.plist file. You should have the Application Scene Manifest key set up.

Step 1: Configure Info.plist

Add the following keys to your Info.plist:

  • UIApplicationSceneManifest
  • Scene Configuration - Include a default configuration for your scenes.

Step 2: Modify Your App Delegate

The AppDelegate needs to adopt the UISceneDelegate method. Here's a sample implementation to get you started:

import UIKit @main class AppDelegate: UIResponder, UIApplicationDelegate { var window: UIWindow? func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration { return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role) } func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set) { // Handle the discarded scenes } }

Step 3: Implement Your Scene Delegate

Next, you need to implement your SceneDelegate class that will handle the lifecycle of the scene:

import UIKit class SceneDelegate: UIResponder, UIWindowSceneDelegate { var window: UIWindow? func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) { guard let windowScene = scene as? UIWindowScene else { return } let window = UIWindow(windowScene: windowScene) window.rootViewController = YourInitialViewController() self.window = window window.makeKeyAndVisible() } func sceneDidDisconnect(_ scene: UIScene) { // Release any resources associated with this scene } func sceneDidBecomeActive(_ scene: UIScene) { // Restart any tasks that were paused } func sceneWillResignActive(_ scene: UIScene) { // Pause ongoing tasks } func sceneWillEnterForeground(_ scene: UIScene) { // Undo changes made on entering the background } func sceneDidEnterBackground(_ scene: UIScene) { // Save data to restore upon next foreground } }

Swift iOS Scene-based lifecycle UISceneDelegate AppDelegate SceneDelegate UIWindow UIApplication

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