如何使用闪光灯在自定义相机上拍照？

Question

我到处看了看，但我不知道如何以这种方式切换闪光灯，当我拍照时它会像在 iPhone 相机上那样闪烁 4 次。

我正在使用这个功能来切换闪光灯...

func toggleFlash() {
    let device = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)
    if (device.hasTorch) {
        device.lockForConfiguration(nil)
        if (device.torchMode == AVCaptureTorchMode.On) {
            device.torchMode = AVCaptureTorchMode.Off
        } else {
            device.setTorchModeOnWithLevel(1.0, error: nil)
        }
        device.unlockForConfiguration()
    }
}

而且我用这个功能拍照...

func didPressTakePhoto(){
    if let videoConnection = stillImageOutput?.connectionWithMediaType(AVMediaTypeVideo){
        videoConnection.videoOrientation = AVCaptureVideoOrientation.Portrait
        stillImageOutput?.captureStillImageAsynchronouslyFromConnection(videoConnection, completionHandler: {
            (sampleBuffer, error) in

            if sampleBuffer != nil {

                var imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(sampleBuffer)
                var dataProvider  = CGDataProviderCreateWithCFData(imageData)
                var cgImageRef = CGImageCreateWithJPEGDataProvider(dataProvider, nil, true, kCGRenderingIntentDefault)

                var image:UIImage!

                if self.camera == true {
                    image = UIImage(CGImage: cgImageRef, scale: 1.0, orientation: UIImageOrientation.Right)

                } else {
                    image = UIImage(CGImage: cgImageRef, scale: 1.0, orientation: UIImageOrientation.LeftMirrored)

                }
                self.tempImageView.image = image
                self.tempImageView.hidden = false
            }


        })
    }


}

Answer 1

这是一个非常混乱的方式。不干净。

func didPressTakePhoto(){

toggleFlash()
sleep(1)
toggleFlash()

if let videoConnection = stillImageOutput?.connectionWithMediaType(AVMediaTypeVideo){
    videoConnection.videoOrientation = AVCaptureVideoOrientation.Portrait
    stillImageOutput?.captureStillImageAsynchronouslyFromConnection(videoConnection, completionHandler: {
        (sampleBuffer, error) in

        if sampleBuffer != nil {

            toggleFlash()

            var imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(sampleBuffer)
            var dataProvider  = CGDataProviderCreateWithCFData(imageData)
            var cgImageRef = CGImageCreateWithJPEGDataProvider(dataProvider, nil, true, kCGRenderingIntentDefault)

            var image:UIImage!
            if self.camera == true {
                image = UIImage(CGImage: cgImageRef, scale: 1.0, orientation: UIImageOrientation.Right)

            } else {
                image = UIImage(CGImage: cgImageRef, scale: 1.0, orientation: UIImageOrientation.LeftMirrored)

            }
            self.tempImageView.image = image
            self.tempImageView.hidden = false
        }


    })
}


}

这很混乱，只是一个想法。 你也可以使用 NSTimer 来触发它两次。