How do you migrate to the new SwiftUI App Protocol?

Question

I am working on a SwiftUI app that still has the Scene / App Delegate files and would like to migrate it to the new SwiftUI App Protocol.

Is this only a matter of deleting the Scene / App Delegate files, then adding my ContentView (Initial View in my case) to the @main struct???

Thank you!

@main
struct TestApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}

Answer 1

You need to follow these steps to migrate a SwiftUI application to the new App life cycle:

1. Create a new App struct and add the @main annotation:

@main
struct TestApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}

2. Remove the @main annotation from AppDelegate.

3. Remove Scene Configuration from Info.plist:

4. (Optionally) Move AppDelegate/SceneDelegate methods:

• SwiftUI app life cycle iOS14 where to put AppDelegate code?
• Is there any way to call SceneDelegate methods in iOS 14 app life cycle?

5. Now you can remove the AppDelegate and SceneDelegate classes from the project (first make sure the app is indeed working as expected).