iPhone开发mpmovieplayer崩溃

Question

我正在开发一款应用程序,让我可以通过iPhone远程在iPad上播放不同的视频.我一直在关注视频播放器的苹果示例,但我遇到了一些麻烦.视频播放得很好,我可以从各种视频播放,但在它们之间切换几次会崩溃,我在调试器中得到这个:

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'An        AVPlayerItem cannot be associated with more than one instance of AVPlayer'
*** First throw call stack:
(0x380da8bf 0x37c261e5 0x30acbcb5 0x30abc1f7 0x30ac3bf3 0x30c93d55 0x30c95f7b 0x380ad2dd   0x380304dd 0x380303a5 0x37e07fcd 0x31bb0743 0x25e5 0x257c)

这是我用来创建播放器的代码:

MPMoviePlayerController *player = [[MPMoviePlayerController alloc] initWithContentOfURL:movieURL];
if (player) {
    [self setMoviePlayerController:player];
    [self installMovieNotificationObservers];
    [player setContentURL:movieURL];
    [player setMovieSourceType:sourceType];
    [self applyUserSettingsToMoviePlayer];
    [self.view addSubview:self.backgroundView];
    [player.view setFrame:self.view.bounds];
    [player.view setBackgroundColor = [UIColor blackColor];
    [self.view addSubview:player.view];
}

当当前电影停止时,我使用:

[[self moviePlayerController] stop];

MPMoviePlayerController *player = [self moviePlayerController];
[player.view removeFromSuperview];

[self removeMovieNotificationHandlers];
[self setMoviePlayerController:nil];

编辑:所以我现在发现每当我尝试第11次切换视频时都会发生这种情况.奇怪的!我几乎把头发拉了出来.

Answer 1

解决这个问题的原因是在执行setContentURL之前停止了MPMoviePlayerController.

    MPMoviePlayerController *streamPlayer;

    [streamPlayer stop];
    [streamPlayer setContentURL:[NSURL URLWithString:selectedStation]];

Answer 2

在上面的实现中，ARC 不知道 MPMoviePlayerController 已完成并且需要释放。

在 .h 文件中定义 MPMoviePlayerController 并使其可通过 @property （和 @synthesize）进行访问。

@property (strong, nonatomic) MPMoviePlayerController * moviePlayerController;

然后获取 alloc 和 init 的结果并将其分配给该结果。IE

self.moviePlayerController = [[MPMoviePlayerController alloc] initWithContentOfURL:movieURL];