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When a user toggles an AVPlayerViewController into full-screen mode, it presents a modal view controller of type AVFullScreenViewController (a private class).

Your app might want to dismiss that presented modal view controller programmatically—for example, if the user opens a URL which your app can handle.

But calling `dismissViewControllerAnimated:completion:` on the presenting view controller crashes the app with the following exception:

*** Terminating app due to uncaught exception 'UIViewControllerHierarchyInconsistency', reason: 'child view controller:<AVEmbeddedPlaybackControlsViewController: 0x7fe49a0aaed0> should have parent view controller:<AVPlayerViewController: 0x7fe499c6fa80> but actual parent is:<AVFullScreenViewController: 0x7fe499c93030>’

It seems like the AVPlayerViewController and AVFullScreenViewController collaborate via view controller containment to share some controls, but that collaboration doesn't happen when a developer tries to call `dismissViewControllerAnimated:completion:`.


Steps to Reproduce:

1. Create an inline AVPlayerViewController
2. Run the app, and put that player into full-screen mode
3. Call [self dismissViewControllerAnimated:YES completion:nil] while the full screen AV player is presented


Expected Results:

The fullscreen player should be dismissed, like any other view controller would be 


Actual Results:

The app crashes:

*** Terminating app due to uncaught exception 'UIViewControllerHierarchyInconsistency', reason: 'child view controller:<AVEmbeddedPlaybackControlsViewController: 0x7fe49a0aaed0> should have parent view controller:<AVPlayerViewController: 0x7fe499c6fa80> but actual parent is:<AVFullScreenViewController: 0x7fe499c93030>’


Configuration:

iPhone 6 Simulator, iPad Air Simulator, physical iPad Air device