Tells the delegate when the app has finished launching. Don’t use. Instead, use
- iOS 2.0+
- Mac Catalyst 13.0+
- tvOS 9.0+
The singleton app object.
Your implementation of this method should create your app’s user interface and initialize the app’s data structures. If your app persists its state between launches, you would also use this method to restore your app to its previous state.
After calling this method, the app also posts a
did notification to give interested objects a chance to respond to the initialization cycle.