how to migrate from AppDelegate to SceneDelegate
Asked on 2025-07-28
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To migrate from AppDelegate to SceneDelegate, you need to adopt the UI Scene Lifecycle, which is becoming mandatory in future iOS releases. Here are the steps to guide you through the migration process:
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Update Your App's Info.plist: Define scene configurations in your app's Info.plist file. Each configuration specifies the storyboard or SwiftUI view to use and the delegate class that manages the scene.
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Implement SceneDelegate: Create a
SceneDelegateclass that conforms to theUIWindowSceneDelegateprotocol. This class will manage the lifecycle of each scene. -
Configure Scene Sessions: In your
AppDelegate, implement theapplication(_:configurationForConnecting:options:)method to return the appropriate scene configuration based on the session's role. -
Manage Scene Lifecycle: Use the
SceneDelegateto manage the lifecycle events of your scenes, such as when they connect, disconnect, or move to the background. This is where you can handle tasks like pausing ongoing activities or saving state. -
State Restoration: Implement state restoration in your
SceneDelegateto ensure that the UI state of a scene is preserved and restored correctly.
For more detailed guidance, you can refer to the session Make your UIKit app more flexible (02:01) from WWDC 2025, which covers the importance of adopting the UI Scene Lifecycle and provides examples of how to implement it.
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