CameraTorchIOS.mm

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#import <AVFoundation/AVFoundation.h>
 
void turnTorchOn(bool state)
{
  // check if flashlight available
  Class captureDeviceClass = NSClassFromString(@"AVCaptureDevice");
  if (captureDeviceClass != nil)
  {
    AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    if ([device hasTorch] && [device hasFlash])
    {
      [device lockForConfiguration:nil];
      if (state)
      {
        [device setTorchMode:AVCaptureTorchModeOn];
        [device setFlashMode:AVCaptureFlashModeOn];
      }
      else
      {
        [device setTorchMode:AVCaptureTorchModeOff];
        [device setFlashMode:AVCaptureFlashModeOff];
      }
      [device unlockForConfiguration];
    }
  }
}