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我正在尝试使用Xcode的一些示例代码在iPhone模拟器5.1下播放mp4视频.我创建了MPMovieViewController和MPMovieController,提供了一个包含mp4的本地路径,并将其作为子视图添加到我的根控制器.

当我在iPhone模拟器下运行时,只显示后屏幕.我在SO中尝试了几个相同问题的建议,但它仍然不起作用.

这是代码:

    NSURL *myURL = [[NSURL alloc] initFileURLWithPath:[[NSBundle mainBundle] pathForResource:@"VIDEO_CX75_01" ofType:@"mp4"]];

    MPMoviePlayerViewController *moviePlayerViewController = [[MPMoviePlayerViewController alloc] initWithContentURL:myURL];        
    MPMoviePlayerController *player = [[MPMoviePlayerController alloc] initWithContentURL: myURL];

    [self presentMoviePlayerViewControllerAnimated:moviePlayerViewController];

    [player.view setFrame: self.view.bounds];  // player's frame must match parent's
    [self.view addSubview: player.view];
    player.view.frame = self.view.frame;

    player.initialPlaybackTime = -1.0;
    [player prepareToPlay];
    [player play];

我做错了什么？

PS:我在Xcode 4.3.2上