AVPlayerViewController全屏问题（iOS 9 beta 2）

Question

我正在从MPMoviePlayer迁移到AVPlayer / AVPlayerViewController。一切正常，除了当我通过屏幕控制缩放到全屏幕，电影结束播放后，全屏模式不会消失并卡在那里。我在iOS 9 beta 2上运行它。

这是我的代码：

AVPlayerItem *playerItem = [AVPlayerItem playerItemWithURL:url];
self.playerController.player = [AVPlayer playerWithURL:url];
self.playerController.view.frame = self.imageView.frame;

[self.view addSubview:self.playerController.view];
[self.playerController.player play];

NSNotificationCenter *notificationCenter = [NSNotificationCenter defaultCenter];
[notificationCenter addObserver:self selector:@selector(stopVideo:) name:AVPlayerItemDidPlayToEndTimeNotification object:nil];

当电影停止时，我运行以下stopVideo代码：

[self.playerController.player pause];
[self.playerController.view removeFromSuperview];

是我的代码还是iOS 9的错误？