ios - AVFoundation-如何在拍摄图像之前将闪光灯设置为自动/关闭

我正在做一个类似Instagram的应用程序，我在ATM上有一个工作代码，可以捕获照片并将其保存在设备的照片库中。摄像机预览用作后/前摄像机开关。我现在遇到的问题是，如果我按下按钮，则在捕获功能中提供一段代码即可将闪光灯设置为.auto或.off，因此当我拍摄照片时，闪光灯将可以工作。这是我的捕获代码：

func capture(_ captureOutput: AVCapturePhotoOutput, didFinishProcessingPhotoSampleBuffer photoSampleBuffer: CMSampleBuffer?, previewPhotoSampleBuffer: CMSampleBuffer?, resolvedSettings: AVCaptureResolvedPhotoSettings, bracketSettings: AVCaptureBracketedStillImageSettings?, error: Error?) {

        if let error = error {
            print("error occure : \(error.localizedDescription)")
        }

        if  let sampleBuffer = photoSampleBuffer,
            let previewBuffer = previewPhotoSampleBuffer,
            let dataImage =  AVCapturePhotoOutput.jpegPhotoDataRepresentation(forJPEGSampleBuffer:  sampleBuffer, previewPhotoSampleBuffer: previewBuffer) {
            print(UIImage(data: dataImage)?.size as Any)

            let dataProvider = CGDataProvider(data: dataImage as CFData)
            let cgImageRef: CGImage! = CGImage(jpegDataProviderSource: dataProvider!, decode: nil, shouldInterpolate: true, intent: .defaultIntent)
            let image = UIImage(cgImage: cgImageRef, scale: 1.0, orientation: UIImageOrientation.right)
            UIImageWriteToSavedPhotosAlbum(image, self, nil, nil)
            self.cameracapture.image = image
        } else {
            print("some error here")
        }
    }

最佳答案

这是我使用的代码：

let device = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)
    if device.hasTorch {
        do {
            try device.lockForConfiguration()
            device.torchMode = AVCaptureTorchMode.On
            device.torchMode = AVCaptureTorchMode.Off
            device.torchMode = AVCaptureTorchMode.Auto
            device.unlockForConfiguration()
        } catch {
            print(error)
        }
    }

希望对您有所帮助。 :)

关于ios - AVFoundation-如何在拍摄图像之前将闪光灯设置为自动/关闭，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/42559271/