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我正在一个播放音频流的应用程序中工作。我添加了观察者：playbackBufferEmpty 和playbackLikelyToKeepUp 以在互联网连接丢失时实现“缓冲”消息。这就是以下代码发生的情况：它开始播放没有问题，我看到“good to go”消息，如果我失去了连接，它会检测到playbackBufferEmpty，我看到“buffering”消息，但是当连接恢复时就像观察者丢失了，它甚至没有使用playbackLikelyToKeepUp 运行observeValueForKeyPath 方法。

这是我的代码：

- (void)viewDidLoad
{    
    …
    NSString *urlstr = @"http://xxxxxxx.aac";
    NSURL *url=[NSURL URLWithString:urlstr];
    playerItem = [[AVPlayerItem playerItemWithURL:url]retain];

    [playerItem addObserver:self forKeyPath:@"playbackBufferEmpty" options:NSKeyValueObservingOptionNew context:nil];
    [playerItem addObserver:self forKeyPath:@"playbackLikelyToKeepUp" options:NSKeyValueObservingOptionNew context:nil];

    player = [[AVPlayer playerWithPlayerItem:playerItem] retain];

-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object
                    change:(NSDictionary *)change context:(void *)context {



   if (object == playerItem && [keyPath isEqualToString:@"playbackBufferEmpty"]){



        if (playerItem.playbackBufferEmpty) {

        escuchando.text = @"buffering";


    }
}

else if (object == playerItem && [keyPath isEqualToString:@"playbackLikelyToKeepUp"])
{
    if (playerItem.playbackLikelyToKeepUp)
    {

        escuchando.text = @"good to go";

    }
}

谢谢你的帮助！

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