AVPlayerItem
AVPlayer
网络视频
本地视频
AVAsset *movieAsset = [AVURLAsset URLAssetWithURL:url options:nil]; _playerItem = [AVPlayerItem playerItemWithAsset:movieAsset];
[_player replaceCurrentItemWithPlayerItem:_playerItem]
_playerItem = [AVPlayerItem playerItemWithURL:url];
1.通过KVO 监听 播放状态\"status\" ，缓冲进度\"loadedTimeRanges\"
