MPMoviePlayerLoadStateDidChangeNotification适用于iOS 5，但不适用于iOS 6

Question

我想用MPMoviePlayerViewController播放视频。所以在我的视图控制器中，我注册为MPMoviePlayerLoadStateDidChangeNotification的观察者。

我再初始化MPMoviePlayerViewController：

self.mPlayerVC = [[MPMoviePlayerViewController alloc] initWithContentURL:[NSURL URLWithString:@"<videoURL>"]]; 

，并等待通知到达。当它执行此代码时：

MPMoviePlayerController* playerController = notification.object; 

if ([playerController loadState] & MPMovieLoadStatePlayable) { 
    if (self.mPlayerVC) { 
     [self presentMoviePlayerViewControllerAnimated:self.mPlayerVC]; 
    } 
} 

任何人都知道为什么这适用于iOS 5但不适用于iOS 6？谢谢

Answer 1

似乎有iOS 6的MediaPlayer.framework中的错误。要初始化的MPMoviePlayerViewController

self.mPlayerVC = [[MPMoviePlayerViewController alloc] initWithContentURL:[NSURL URLWithString:@"<videoURL>"]]; 
[self.mPlayerVC.moviePlayer prepareToPlay]; 

后获得视频播放我打电话prepareToPlay现在通知再次进来，但应用程序崩溃时我打电话[self presentMoviePlayerViewControllerAnimated:self.mPlayerVC];在被称为该MPMoviePlayerLoadStateDidChangeNotification的方法。

，防止死机更换

[self presentMoviePlayerViewControllerAnimated:self.mPlayerVC]; 

的东西，如

if ([self respondsToSelector:@selector(presentViewController:animated:completion:)]) { 
[self presentViewController:self.mPlayerVC animated:YES completion:nil]; 
} 
else if ([self respondsToSelector:@selector(presentModalViewController:animated:)]) { 
[self presentModalViewController:self.mPlayerVC animated:YES]; 
}