koingdev · June 26, 2020 07:36 · Jun 26, 2020
diff --git a/Brightness.swift b/Brightness.swift
@@ -0,0 +1,56 @@
+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)
+	}
+
+}