<UITabBarController>, state: appeared, view: <UILayoutContainerView>
   | <UINavigationController>, state: appeared, view: <UILayoutContainerView>
   |    | <UIPageViewController>, state: appeared, view: <_UIPageViewControllerContentView>
   |    |    | <UIViewController>, state: appeared, view: <UIView>
   | <UINavigationController>, state: disappeared, view: <UILayoutContainerView> not in the window
   |    | <UIViewController>, state: disappeared, view: (view not loaded)
   | <UINavigationController>, state: disappeared, view: <UILayoutContainerView> not in the window
   |    | <UIViewController>, state: disappeared, view: (view not loaded)
   | <UINavigationController>, state: disappeared, view: <UILayoutContainerView> not in the window
   |    | <UIViewController>, state: disappeared, view: (view not loaded)
   | <UINavigationController>, state: disappeared, view: <UILayoutContainerView> not in the window
   |    | <UIViewController>, state: disappeared, view: (view not loaded)