1. What is UITransitionView?
  2. What is UILayoutContainerView?
  3. Will I get in trouble for adding subviews to them?

They are the superviews of a UITableView which is inside of a UINavigationController which is inside of a UITabBarController.

UITransitionView I got by asking for the superview of the table view. UILayoutContainerView I got by asking for the superview of UITransitionView.

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