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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() } } }
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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() } } }

  1. Remove the @main annotation from AppDelegate.

  2. Remove Scene Configuration from Info.plist:

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  1. (Optionally) Move AppDelegate/SceneDelegate methods:

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

  2. Reinstall the app (as suggested in the comments).

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4 Comments

Also you need totally reinstall app from your device with clean up
You actually don't need to reinstall the app, at least on the simulator. You just need to completely close the app and restart
@SoundBlaster you are such a life-saver. I was having a heart attack not understanding why after doing all of this, my app would launch as Catalyst target but not load the SwiftUI 'App' on iOS.
@GBreen12 not sure about that. I just followed the steps exactly and was only getting a black screen on iOS until I removed and reinstalled the app.