播放视频音频文件使用 MPMoviePlayerViewController

    MPMoviePlayerViewController *_moviePlayer = [[[MPMoviePlayerViewController alloc]initWithContentURL:[NSURL fileURLWithPath:URLStr]] autorelease];
	
	_moviePlayer.moviePlayer.scalingMode=MPMovieScalingModeAspectFit;//窗口模式设置
	_moviePlayer.moviePlayer.controlStyle=MPMovieControlStyleFullscreen;//一共有四种，可参考文档，设计播放控制
    
    [self presentMoviePlayerViewControllerAnimated:_moviePlayer];

播放完成或者点击完成，自动退出