如何判断发送给MPMediaPlayer的消息已经超时？

Question

我一直在使用3.0 SDK的MPMediaPlayer框架。有时媒体播放器响应缓慢，或根本没有响应。我在控制台中收到警告消息，但用户永远不会看到这些消息（从而责怪我的应用程序超时）。

有没有办法从这些超时中恢复？我可以将事情设置为不重试吗？

Answer 1

您的应用注册是否接收来自MPMediaPlayer的通知？我没有看到这些超时，所以我不知道他们是否返回了MPMoviePlayerContentPreloadDidFinishNotification，其中包含填充了错误的userInfo。

来自MPMoviePlayerController.h：

MP_EXTERN NSString *const MPMoviePlayerContentPreloadDidFinishNotification; // userInfo contains NSError for @"error" key if preloading fails

来自MoviePlayer示例代码：

// Register to receive a notification that the movie is now in memory and ready to play
[[NSNotificationCenter defaultCenter] addObserver:self 
                 selector:@selector(moviePreloadDidFinish:) 
                 name:MPMoviePlayerContentPreloadDidFinishNotification 
                 object:nil];

// Register to receive a notification when the movie has finished playing. 
[[NSNotificationCenter defaultCenter] addObserver:self 
                selector:@selector(moviePlayBackDidFinish:) 
                name:MPMoviePlayerPlaybackDidFinishNotification 
                object:nil];

// Register to receive a notification when the movie scaling mode has changed. 
[[NSNotificationCenter defaultCenter] addObserver:self 
                selector:@selector(movieScalingModeDidChange:) 
                name:MPMoviePlayerScalingModeDidChangeNotification 
                object:nil];