How to focus FRONT camera on device using iOS, swift?

Question

it seems that front camera doesn't support focusMode.

func configureDevice() {
    if let device = captureDevice {
        let focusMode: AVCaptureFocusMode = .AutoFocus
        if device.isFocusModeSupported(focusMode) {
            device.lockForConfiguration(nil)
            device.focusMode = AVCaptureFocusMode.AutoFocus
            device.unlockForConfiguration()
            println("configured device")
        }
    }
}

This code doesn't run because

if device.isFocusModeSupported(focusMode) 

returns false.

But within the built-in-camera-app, front camera can focus on tap.

Is there any way implement tap-to-focus on the FRONT camera?

Answer 1

The front-facing camera does not support tap-to-focus on any iPhone. You can use device.focusPointOfInterestSupported property to check if you can do tap-to-focus (but you will get false, as with isFocusModeSupported())

What you are seeing is tap-for-exposure, and you can check for that with device.exposurePointOfInterestSupported. Once you know that you can use it, use device.exposurePointOfInterest to set your PoI.

All the details of each mode is explained to detail in Apple Docs

Hope it helps!