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CLFContainerViewController makes it much easier to create custom container view controllers.
With this class, you can create container view controllers whose children occupy the entire bounds of the container. For example, your subclass could mimic a UINavigationController, a UITabBarController, or a UIPageViewController, though you are certainly not limited to recreating already existing containers.
The view controller hierarchy, the view hierarchy, and the view appearance calls are all managed by the base class, so you won't have to worry about any of those details when creating your custom container class. Instead, you can focus on how your container will look and act.