How to set screen brightness with fade animations?

Question

Is it possible to animate the screen brightness change on iOS 5.1+? I am using [UIScreen mainScreen] setBrightness:(float)] but I think that the abrupt change i

Answer 1

You can use this helper if you need to change brightness of your specific ViewController

import Foundation
import UIKit

final class ScreenBrightness {

    private var timer: Timer?
    private var brightness: CGFloat?
    private var isBrighteningScreen = false
    private var isDarkeningScreen = false

    private init() { }

    static let shared = ScreenBrightnessHelper()

    //Увеличение яркости экрана до максимального уровня
    func brightenDisplay() {
        resetTimer()
        isBrighteningScreen = true
        if #available(iOS 10.0, *), timer == nil {
            brightness = UIScreen.main.brightness
            timer = Timer.scheduledTimer(withTimeInterval: 0.01, repeats: true) { (timer) in
                UIScreen.main.brightness = UIScreen.main.brightness + 0.01
                if UIScreen.main.brightness > 0.99 || !self.isBrighteningScreen {
                    self.resetTimer()
                }
            }
        }
        timer?.fire()
    }

    //Затемнение экрана до предыдущего уровня
    func darkenDisplay() {
        resetTimer()
        isDarkeningScreen = true
        guard let brightness = brightness else {
            return
        }
        if #available(iOS 10.0, *), timer == nil {
            timer = Timer.scheduledTimer(withTimeInterval: 0.01, repeats: true) { (timer) in
                UIScreen.main.brightness = UIScreen.main.brightness - 0.01

                if UIScreen.main.brightness <= brightness || !self.isDarkeningScreen {
                    self.resetTimer()
                    self.brightness = nil
                }
            }
            timer?.fire()
        }
    }

    private func resetTimer() {
        timer?.invalidate()
        timer = nil
        isBrighteningScreen = false
        isDarkeningScreen = false
    }
}

Call ScreenBrightness.shared.brightenDisplay() in viewWillAppear and if you wanna change it back call method ScreenBrightness.shared.darkenDisplay() that will change brightness back