How to smoothly change screen brightness in Swift 3?

Question

I'm new to iOS app development and I'm trying to change the screen brightness but it happens pretty abruptly. Is there a way to animate the screen brightness smoothly?

Answer 1

Instead of a timer, a Swift extension:

  extension UIScreen {

    private static let step: CGFloat = 0.1

    static func animateBrightness(to value: CGFloat) {
        guard fabs(UIScreen.main.brightness - value) > step else { return }

        let delta = UIScreen.main.brightness > value ? -step : step

        DispatchQueue.main.asyncAfter(deadline: .now() + 0.01) {
            UIScreen.main.brightness += delta
            animateBrightness(to: value)
        }
    }
}