我制作视频捕捉iOS应用程序，我希望能够录制麦克风的音频，同时允许播放背景音乐。我可以做所有这些，但只要相机的视图进入和退出前景，背景音频就会跳过（暂停）。我已将错误隔离到AVCaptureSession addInput：
AVCaptureSession session = [[AVCaptureSession alloc] init];
session.automaticallyConfiguresApplicationAudioSession = NO;
AVCaptureDevice *audioDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio];
AVCaptureDeviceInput *audioDeviceInput = [AVCaptureDeviceInput deviceInputWithDevice:audioDevice error:nil];
// this line causes the background music to skip
[session addInput:audioDeviceInput];
如何防止添加麦克风输入影响背景音频？
fyi - in didFinishLaunchingWithOptions我设置了AVAudioSession类别：
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord
withOptions:AVAudioSessionCategoryOptionMixWithOthers | AVAudioSessionCategoryOptionDefaultToSpeaker
error:nil];