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错误消息:MPMoviePlayerController实例已在播放

cocoa-touch iphone

kdbdallas · 技术社区 · 17 年前

第一次这样做效果很好,但是在观看1个视频后,如果您尝试观看其他内容,应用程序会在MPMoviePlayerController的播放方法上崩溃,并出现以下错误:

***由于未捕获异常“MPMoviePlayerController播放异常”而终止应用程序,原因:“MPMoviePlayerController实例已在播放”

我不明白为什么会这样。

我在另一个应用程序中有非常相似的代码,我没有得到这个错误。

我正在为设备-2.0进行编译,并在固件为2.2.1的iPhone上运行它。

这是我的代码:

@synthesize movieURL;

- (void) setMovieAndPlay
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    moviePath = [[[paths lastObject] stringByAppendingPathComponent:movieURL] retain];

    [self playVideoWithURL:[NSURL fileURLWithPath:moviePath]];
}

-(void)playMovieAtURL:(NSURL*)theURL
{
     MPMoviePlayerController *mMoviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:theURL];
    mMoviePlayer.scalingMode = MPMovieScalingModeAspectFill;

     if ([defaults boolForKey:@"disableControls"])
     {
          mMoviePlayer.movieControlMode = MPMovieControlModeHidden;
     }

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(moviePlayBackDidFinish:) name:MPMoviePlayerPlaybackDidFinishNotification object:mMoviePlayer];

    [mMoviePlayer play];
}

- (void) moviePlayBackDidFinish:(NSNotification*)notification
{
     MPMoviePlayerController *theMovie = [notification object];

     [[NSNotificationCenter defaultCenter] removeObserver:self name:MPMoviePlayerPlaybackDidFinishNotification object:theMovie];

     [theMovie release];
     theMovie = nil;

     NSDictionary *notiUserInfo = [notification userInfo];

     if (notiUserInfo != nil)
     {
          NSError *errorInfo = [notiUserInfo objectForKey:@"error"];

          if ([[errorInfo domain] isEqualToString:@"MediaPlayerErrorDomain"])
          {
               UIAlertView *notice = [[UIAlertView alloc] initWithTitle:@"Error" message:[errorInfo localizedDescription] delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
               [notice show];
               [notice release];

               return;
          }
     }

     if ([defaults boolForKey:@"autoRepeat"])
     {
          [self playMovieAtURL:[NSURL fileURLWithPath:moviePath]];
     }
     else
     {
          KFAppDelegate *appDelegate = (KFAppDelegate *)[[UIApplication sharedApplication] delegate];
          [appDelegate endMovie];
     }
}

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    KFAppDelegate *appDelegate = (KFAppDelegate *)[[UIApplication sharedApplication] delegate];
    [appDelegate endMovie];
}

更奇怪的是,如果您查看代码,在电影结束后,我会检查用户是否启用了自动重复。

如果他们有,我只是重新开始电影,这是有效的。

但是,如果他们没有启用自动重复并离开该类,然后尝试观看另一部电影(或同一部),则会导致崩溃。

有人知道为什么会这样吗?

我做错什么了吗?

谢谢

4 回复 | 直到 17 年前

Toonsy Net Toonsy Net 17 年前

这是我的解决办法。我必须使用NSTimer让下一次播放等待1秒,否则我会得到每个人都在谈论的唯一音频问题。这是针对2.2.1的。

- (void) moviePlayBackDidFinish:(NSNotification*)notification
{
    [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(playTrack) userInfo:nil repeats:NO];
}

- (void) playTrack {

[moviePlayer stop];
[[NSNotificationCenter defaultCenter] removeObserver:self name:MPMoviePlayerPlaybackDidFinishNotification object:moviePlayer];
[moviePlayer release];

    NSURL *nsUrl = [NSURL URLWithString:track.url];
    moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:nsUrl];

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

sth 16 年前

- (void) moviePlayBackDidFinish:(NSNotification*)notification
{
    // you should add this:
    if (mMoviePlayer != nil) {
        // free the old movie player
        NSLog(@"releasing!");
        [mMoviePlayer release];
        [[NSNotificationCenter defaultCenter] removeObserver:self];
    }
}

lostInTransit 17 年前

创建MPMoviePlayerController的实例变量,并在整个代码中使用它。所以不是

theMovie = [notification object];
[theMovie release];
theMovie = nil;

使用实例变量,并在PlayMovieAttribute和playbackDidFinish方法中使用该变量。我的问题是电影播放器对象没有被释放,因此我无法看到下一个视频,只能听到音频播放。

希望这会有帮助。

kdbdallas 14 年前

这似乎已在较新的iOS版本中修复。