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使用下面的代码。音乐播放器根本无法在我的设备上播放。我正在运行 iOS 5，并且在控制台中收到一些奇怪的神秘警告，例如 wait_fences no reply 和 Invalid Track

这是代码：

    - (IBAction)openMediaPicker:(id)sender {
    [[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationFade];
    MPMediaPickerController *mediaPicker = [[MPMediaPickerController alloc] initWithMediaTypes:MPMediaTypeAny];
    mediaPicker.delegate = self;
    mediaPicker.allowsPickingMultipleItems = YES;
    mediaPicker.prompt = @"Select songs to play";
    [self presentModalViewController:mediaPicker animated:YES];
    [mediaPicker release];
} 

- (void)mediaPicker: (MPMediaPickerController *)mediaPicker didPickMediaItems:(MPMediaItemCollection *)mediaItemCollection {
    AppTestAppDelegate *appDelegate = (AppTestAppDelegate *)[[UIApplication sharedApplication] delegate];
    [appDelegate.tr2 stop];

    if (mediaItemCollection) {
        self.musicPlayer = [MPMusicPlayerController iPodMusicPlayer]; 
        [self.musicPlayer setQueueWithItemCollection:mediaItemCollection];
        [self.musicPlayer play];
    }

    [playstopButton setHidden:NO];
    [playstopButton setImage:[UIImage imageNamed:@"Stop-Music-Button.png"] forState:UIControlStateNormal];
    // We need to dismiss the picker
    [self dismissModalViewControllerAnimated:YES];
    [[UIApplication sharedApplication] setStatusBarHidden:NO withAnimation:UIStatusBarAnimationFade];
}

没有崩溃或任何东西，但它只是不播放任何东西

这里有什么问题吗？为什么它不起作用？

谢谢！

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