How to turn flashlight ON and OFF in swift?

Question

I\'d like to add flashlight functionality to my app in Swift. How can I go about doing that?

Answer 1

Updated Swift 4 Answer:

func toggleTorch(on: Bool) {
    guard 
        let device = AVCaptureDevice.default(for: AVMediaType.video),
        device.hasTorch
    else { return }

    do {
        try device.lockForConfiguration()
        device.torchMode = on ? .on : .off                    
        device.unlockForConfiguration()
    } catch {
        print("Torch could not be used")
    }
}

Then to actually turn it on or off, call the function and pass in a true or false boolean.

toggleTorch(on: true) of toggleTorch(on: false)

I got this answer from Hacking with Swift, however their example had an error in it.

They used AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo) but this produces an error saying defaultDevice doesn't exist. So I changed it to AVCaptureDevice.default(for: AVMediaType.video)