iOS 10.2 - Activate Retina Flash instead of Back LED with Torch

Is there a way to specify to the device that when one sets setTorchModeOnWithLevel that they would activate the Retina Flash (iPhone6s/7's front facing flash) instead of the back True-Tone LED Flash?

The following standard code appears to only be able to activate the rear LED:

AVCaptureDevice.defaultDevice(withDeviceType: AVCaptureDeviceType.builtInDualCamera,
     mediaType: AVMediaTypeVideo, position: .front)
try device.lockForConfiguration();
let torchOn = !device.isTorchActive;
try device.setTorchModeOnWithLevel(1.0);
device.unlockForConfiguration();

Does an API exist within iOS for one to have access to the Retina Flash?

Solution

AFAIK iOS DON'T have any API specific to Retina Flash. (as of dated iOS 10.2)

From Apple developer thread

Retina Flash iPhone 6s and 6s Plus contain a custom display chip that allows the retina display to briefly flash 3 times brighter than its usual maximum illuminance. No new API was added to support this feature. Since iOS 4, AVCaptureDevice has supported the -hasFlash, -isFlashModeSupported: and -flashMode properties. The iPhone 6s and 6s Plus front-facing cameras are the first front-facing iOS cameras to respond YES to the -hasFlash property. By setting the front-facing camera's flashMode to AVCaptureFlashModeOn or AVCaptureFlashModeAuto, the retina flash fires when a still image is captured (see AVCaptureStillImageOutput’s captureStillImageAsynchronouslyFromConnection:completionHandler:), just as the True Tone flash fires for rear-facing camera stills.

So to make your code to work check -hasFlash and then set the Flash mode to auto or on.