Objective c 检测与AVPlayerItem连接的短暂中断

如果我启动此流，然后关闭wifi，“Playbackufferempty”将被触发，我可以尝试重新启动该流进行响应。但是，如果我立即关闭wifi并再次打开，则流将停止播放，但不会触发任何观察者

- (void)restartStream
{
    [self.activityIndicator startAnimating];
    NSLog(@"Removing Observers");
    [self.radioStream removeObserver:self forKeyPath:@"status"];
    [self.radioStream removeObserver:self forKeyPath:@"timedMetadata"];
    [self.radioStream removeObserver:self forKeyPath:@"playbackBufferEmpty"];
    [self.radioStream removeObserver:self forKeyPath:@"playbackLikelyToKeepUp"];
    NSLog(@"Creating New AVPlayerItem");
    self.radioStream = [AVPlayerItem playerItemWithURL:[NSURL URLWithString:@"http://mystream.com"]];
    [self.radioStream addObserver:self forKeyPath:@"status" options:0 context:nil];
    [self.radioStream addObserver:self forKeyPath:@"timedMetadata" options:NSKeyValueObservingOptionNew context:nil];
    [self.radioStream addObserver:self forKeyPath:@"playbackBufferEmpty" options:NSKeyValueObservingOptionNew context:nil];
    [self.radioStream addObserver:self forKeyPath:@"playbackLikelyToKeepUp" options:NSKeyValueObservingOptionNew context:nil];
    NSLog(@"Playing radioPlayer with new AVPlayerItem");
    self.radioPlayer = [AVPlayer playerWithPlayerItem:self.radioStream];
}

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似乎是模拟器的问题。设备上会触发“状态”或“Playbackufferempty”