Tells the delegate that the scene is running in the background and is no longer onscreen.
- iOS 13.0+Beta
- Mac Catalyst 13.0+Beta
- tvOS 13.0+Beta
The scene that entered the background.
Use this method to reduce your scene's memory usage, free up any shared resources, and clean up your scene's user interface. Shortly after you return from this method, UIKit takes a snapshot of your scene's interface for display in the app switcher. Make sure your interface doesn't contain sensitive user information.
In addition to calling this method, UIKit also posts a
UIScene notification. For more information about what to do when your app enters the background, see Preparing Your UI to Run in the Background.