Simple Swift Brightness Manager class

Brightness.swift

final class Brightness {
	
	// Config
	private let maxBrightness: CGFloat
	
	private(set) var defaultBrightness: CGFloat = 1.0
	
	var isEnabled = true {
		didSet {
			if isEnabled {
				setBrightnessToMax()
			} else {
				setBrightnessToDefault()
			}
		}
	}
	
	init(maxBrightness: CGFloat = 0.8) {
		self.maxBrightness = maxBrightness
		defaultBrightness = UIScreen.main.brightness
		
		NotificationCenter.default.addObserver(forName: NSNotification.Name.UIApplicationWillResignActive, object: nil, queue: .main) { [weak self] _ in
			guard let s = self else { return }
			if s.isEnabled {
				s.setBrightnessToDefault()
			}
		}
		
		NotificationCenter.default.addObserver(forName: NSNotification.Name.UIApplicationDidBecomeActive, object: nil, queue: .main) { [weak self] _ in
			guard let s = self else { return }
			s.defaultBrightness = UIScreen.main.brightness
			if s.isEnabled {
				s.setBrightnessToMax()
			}
		}
	}
	
	private func setBrightness(toValue value: CGFloat) {
		Queue.main {
			UIScreen.main.brightness = value
		}
	}
	
	private func setBrightnessToMax() {
		setBrightness(toValue: maxBrightness)
	}
	
	private func setBrightnessToDefault() {
		setBrightness(toValue: defaultBrightness)
	}
	
	deinit {
		NotificationCenter.default.removeObserver(self)
	}
	
}