MPMoviePlayerViewController在关闭后仍然工作 - 目标C

Question

如果我点击＆＃34;完成＆＃34;按钮关闭MPMoviePlayerViewController在完成与url的连接之前（BEFORE显示视频），它仍将在后端工作。一段时间后（连接完成时）会听到视频的声音。

有什么问题？

我的代码：

- (void) showVideo:(NSString *)vurl
{
    NSDictionary *videos;
    videos = [HCYoutubeParser h264videosWithYoutubeURL:[NSURL URLWithString:vurl]];

    MPMoviePlayerViewController *mp = [[MPMoviePlayerViewController alloc] initWithContentURL:[NSURL URLWithString:[videos objectForKey:@"medium"]]];

   [[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(moviePlayerDidExitFullscreen:)
                                             name:MPMoviePlayerPlaybackDidFinishNotification
                                           object:mp];

   [mp.moviePlayer prepareToPlay];

    [_window.rootViewController.view addSubview:mp.view];
    [mp release];
}

通知代码：

- moviePlayerDidExitFullscreen:(NSNotification *)theNotification {
ImageTargetsAppDelegate *appDelegate = (ImageTargetsAppDelegate *)[[UIApplication sharedApplication] delegate];

    MPMoviePlayerViewController *player = [theNotification object];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:MPMoviePlayerPlaybackDidFinishNotification object:player];
    [player.view removeFromSuperview];
    [player.moviePlayer stop];
    [player release];
}

如果我也在使用MPMoviePlayerController，问题也是一样的。我正在使用iOS 7.1。

谢谢，