But this should be considered accessing a private view hierarchy (the containment for your view controller) which apps shouldn’t do. Note the superview is a UIViewControllerWrapperView which is an undocumented class internal to UIKit. If it’s not a view you create in your app, then it’s not safe to go add subviews to it or expect any particular behavior from it.
Topic:
UI Frameworks
SubTopic:
UIKit
Tags: