CODEWITHSUNDEEP
iosswiftavfoundationretina
Jake Chasan
Jake Chasan

Reputation: 6560

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?

Upvotes: 2

Views: 816

Answers (1)

Bluewings
Bluewings

Reputation: 3488

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.

Upvotes: 4

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