Objective c MPMoviePlayerController在四秒钟后停止

我正在尝试设置一个非常简单的视频播放器。（iOS 5.1，Xcode 4.3.1）

它在被调用时工作正常，但只播放四秒钟，然后会出现一个黑屏。如果我在播放过程中点击屏幕，它将播放整个序列。如果我停止敲击屏幕四秒钟，就会出现黑屏

我错过了什么

库尔特

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编辑版本播放良好

在接口文件中：

@property (nonatomic,strong) MPMoviePlayerController *myMovieController;

在.m文件中：

-(void)playMedia {
NSString *movieFile = [[NSBundle mainBundle] pathForResource:@"Movie" ofType:@"m4v"];
MPMoviePlayerController *moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:[NSURL fileURLWithPath:movieFile]];

[moviePlayer prepareToPlay];
moviePlayer.view.frame = self.view.bounds;
moviePlayer.scalingMode = MPMovieScalingModeAspectFit;
moviePlayer.movieSourceType = MPMovieSourceTypeFile;
moviePlayer.fullscreen = YES;
moviePlayer.controlStyle = MPMovieControlStyleFullscreen;

self.myMovieController = moviePlayer;
[self.view addSubview: self.myMovieController.view];

[[NSNotificationCenter defaultCenter] addObserver:self 
                                         selector:@selector(playMediaFinished:) 
                                             name:MPMoviePlayerPlaybackDidFinishNotification 
                                           object:moviePlayer];
[self.myMovieController play];
}

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如果你使用ARC，我相信你需要保留外部的电影播放器。我自己刚把它分配到一个新的地方。HTH

解决方案是播放器必须是视图控制器的实例变量或属性。 ie我们必须使用MPMoviePlayerController的实例

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@属性（非原子，强）MPMoviePlayerController*myMovieController

我正在使用ARC，但请原谅我的无知。如果我调用[moviePlayer retain]，我会收到一条错误消息“ARC禁止发送‘retain’的明确消息”。谢谢你的快速回复，明白了。正如你所说，你分配了一个财产。我会编辑这篇文章。好东西，很高兴它成功了。不知道是否有另一种更聪明的方法来做ARC中的retain，就像你说的，你不能显式地调用retain，但是属性完成了任务。为我工作！谢谢倒过来想，我猜这是有道理的。不管怎样，谢谢

-(void)playMedia {
NSString *movieFile = [[NSBundle mainBundle] pathForResource:@"Movie" ofType:@"m4v"];
MPMoviePlayerController *moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:[NSURL fileURLWithPath:movieFile]];

[moviePlayer prepareToPlay];
moviePlayer.view.frame = self.view.bounds;
moviePlayer.scalingMode = MPMovieScalingModeAspectFit;
moviePlayer.movieSourceType = MPMovieSourceTypeFile;
moviePlayer.fullscreen = YES;
moviePlayer.controlStyle = MPMovieControlStyleFullscreen;

self.myMovieController = moviePlayer;
[self.view addSubview: self.myMovieController.view];

[[NSNotificationCenter defaultCenter] addObserver:self 
                                         selector:@selector(playMediaFinished:) 
                                             name:MPMoviePlayerPlaybackDidFinishNotification 
                                           object:moviePlayer];
[self.myMovieController play];
}