Tells you when the scene is presented by a view.
- iOS 7.0+
- macOS 10.9+
- tvOS 9.0+
The view that is presenting the scene.
This method is intended to be overridden in a subclass. You can use this method to implement any custom behavior for your scene when it is about to be presented by a view. For example, you might use this method to create the scene’s contents.