//    AVAudioSession *session = [AVAudioSession sharedInstance];
//    [session setCategory:AVAudioSessionCategoryPlayAndRecord withOptions:AVAudioSessionCategoryOptionDefaultToSpeaker error:nil];
//    [session setActive:YES error:nil];
    self.urlAsset = [AVURLAsset assetWithURL:url];
    self.playerItem = [AVPlayerItem playerItemWithAsset:self.urlAsset];
    self.player = [[AVPlayer alloc] initWithPlayerItem:self.playerItem];
    self.state = PlayerStateBuffering;
    [self createTimeObserve];

上面代码中，配置player的时候，先