AVPlayer在iOS10.3 replaceCurrentItem 崩溃问题的解决办法

AVPlayer在实现连续播放使用replaceCurrentItem来切换音频的时候，在iOS10.3上会出现闪退。

self.player.replaceCurrentItem(with: playerItem)

错误内容如下

invalid mode 'kCFRunLoopCommonModes' provided to CFRunLoopRunSpecific - break on _CFRunLoopError_RunCalledWithInvalidMode to debug. This message will only appear once per execution.

解决办法移除CurrentItem的监听，重新添加即可

private func currentItemAddObserver(){
        addObserver = true
        //监控状态属性，注意AVPlayer也有一个status属性，通过监控它的status也可以获得播放状态
        player.currentItem?.addObserver(self, forKeyPath: "status", options: .new , context: nil)
        //监控缓冲加载情况属性
        player.currentItem?.addObserver(self, forKeyPath: "loadedTimeRanges", options: NSKeyValueObservingOptions.new, context: nil)
        //监控播放完成通知
        NotificationCenter.default.addObserver(self, selector: #selector(playbackFinished(noti:)), name: NSNotification.Name.AVPlayerItemDidPlayToEndTime, object: player.currentItem)
        //监控时间进度
        timeObserver = player.addPeriodicTimeObserver(forInterval: CMTime.init(value: 1, timescale: 1), queue: DispatchQueue.main, using: { (time : CMTime) in
            
        })
    }
    
    private func currentItemRemoveObserver(){
        if addObserver {
            addObserver = false
            guard let currentItem = player.currentItem else { return }
            currentItem.removeObserver(self, forKeyPath: "status")
            currentItem.removeObserver(self, forKeyPath: "loadedTimeRanges")
            NotificationCenter.default.removeObserver(self, name: NSNotification.Name.AVPlayerItemDidPlayToEndTime, object: nil)
            if let observer = self.timeObserver  {
                player.removeTimeObserver(self.timeObserver)
            }
        }
        
    }
    
    currentItemRemoveObserver()
        
        self.player.replaceCurrentItem(with: playerItem)
        if #available(iOS 10.0, *) {
            self.player.automaticallyWaitsToMinimizeStalling = false
        }
        currentItemAddObserver()