in application/PhotoToSketch/PhotoToSketch/CameraScreen/CameraViewController.swift [258:267]
func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) {
guard let imageData = photo.fileDataRepresentation() else { return }
var previewImage = UIImage(data: imageData)
if(cameraState == .front){
previewImage = UIImage(cgImage: previewImage!.cgImage!, scale: previewImage!.scale, orientation: .leftMirrored)
}
imageView.image = previewImage
self.captureState = .captured
self.checkRecordState()
}