我看到一个注释,这个地址 http://developer.apple.com/library/ios/#qa/qa1668/_index.html
注意:如果您禁用电影中的视频轨道,或将 AVPlayerLayer 与其关联的 AVPlayer 分离,它将允许电影音频继续在后台播放。但是,这些更改必须在应用程序实际切换到后台之前生效。
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
[self becomeFirstResponder];
[[AVAudioSession sharedInstance] setDelegate: self];
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
[[AVAudioSession sharedInstance] setActive: YES error: nil];
AVPlayerItem *playerItem = [AVPlayerItem playerItemWithURL:[NSURL fileURLWithPath:AnUrl]];
AVPlayer *avPlayer = [AVPlayer playerWithPlayerItem:playerItem];
AVPlayerLayer *avPlayerLayer = [AVPlayerLayer playerLayerWithPlayer:avPlayer];
avPlayerLayer.frame = self.view.layer.bounds;
UIView *newView = [[UIView alloc] initWithFrame:self.view.bounds];
[newView.layer addSublayer:avPlayerLayer];
[self.view addSubview:newView];
[avPlayer play];
这个程序有效。但是在后台,声音被切断了。我想继续播放只有背景的声音。我如何将 AVPlayerLayer 与 AVPlayer 分离?