This method is called by the runtime when assigning a new UIKit.UIWindow to the UIKit.UIView's view hierarcy. This method will be called on all UIKit.UIViews in the hierarchy, not just the top-level UIKit.UIView.
By default, this method does nothing. Application developers can override the method in order to perform additional processing.
- window
Called before the window at the root of the UIKit.UIView's view hierarchy changes.
This parameter can be null.