小编Han*_*eTV的帖子

我正在尝试实现一个功能,您可以在AVCaptureSession期间启用或禁用麦克风.这是我启用设备的方式(初始化)

-(void)initMicrophoneInput:(AVCaptureSession*)session{
    AVCaptureDevice *audioDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio];
    _microphoneInput = [[AVCaptureDeviceInput alloc] initWithDevice:audioDevice error:nil];
    if ([session canAddInput:_microphoneInput]){
        [session addInput:_microphoneInput];
    } else {
        NSLog(@"can't add input");
    }
}

这是我禁用/启用麦克风的功能:

- (IBAction)manageMicrophone:(id)sender {
    [_captureSession beginConfiguration];
    if(_microphoneMuted == NO){
        [_captureSession removeInput:_microphoneInput];
    }else{
        [self initMicrophoneInput:_captureSession];
    }
    [_captureSession commitConfiguration];
    _microphoneMuted = !_microphoneMuted;
}

初始化和移除麦克风效果很好,但是我无法再次启用麦克风.我的_captureSession.inputs包含"微型"设备,但我不再从中获取音频样本- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection;

我正在制作一个框架，当我的苹果手表进入背景和前景时需要做一些事情。

我正在为 Apple Watch 寻找与此 iOS 代码相当的代码，因为 UIApplication 不再存在于 UIKit 中：

let notificationCenter = NSNotificationCenter.defaultCenter()
notificationCenter.addObserver(self, selector: "applicationDidEnterBackground", name: UIApplicationDidEnterBackgroundNotification, object: nil)

你能帮忙的话，我会很高兴