How can we programmatically change the brightness of the iPhone screen?

Question

How can I change the brightness of the screen programmatically using iPhone SDK?

Seeing as that is a part of official SDK, I suggest you check your sources. http://developer.apple.com/library/IOs/#documentation/UIKit/Reference/UIScreen_Class/Reference/UIScreen.html — Peter Sarnowski, Jan 20 '12 at 05:16

Peter Sarnowski · Accepted Answer · 2014-02-25T09:51:45.050

54

[[UIScreen mainScreen] setBrightness: yourvalue];

Requires iOS 5.0 or later. yourvalue is a float between 0.0 and 1.0.

edited Feb 25 '14 at 09:51

answered Jan 20 '12 at 05:10

Peter Sarnowski

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Glad I could help. You can accept the answer if it is what you were looking for :) – Peter Sarnowski Jan 20 '12 at 05:20
Wouldn't this get you kicked off the App Store though? – Fernando Cervantes May 05 '12 at 21:44
It's a perfectly legal API call. I can't see a reason why there should be any problem with it. – Peter Sarnowski May 21 '12 at 11:53
1

@Robse you may store the original brightness using `UIScreen.mainScreen().brightness` first then restore the brightness using this value at a later stage. – chengsam Aug 08 '16 at 06:32
I add this line `[[UIScreen mainScreen] setBrightness: 0.6f];` to `viewDidAppear` and nothing happened. – Jared Chu Oct 31 '16 at 03:50

iYoung · Answer 2 · 2016-12-13T04:38:49.877

14

UPDATE: For Swift 3

UIScreen.main.brightness = YourBrightnessValue

Here's the swift answer to perform this

UIScreen.mainScreen().brightness = YourBrightnessValue

YourBrightnessValue is a float between 0.0 and 1.0

edited Dec 13 '16 at 04:38

answered Jun 20 '16 at 15:47

iYoung

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3
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to request current brightness: let brillo : CGFloat = UIScreen.main.brightness – oscar castellon Nov 02 '17 at 14:49

score 2 · Answer 3 · answered Oct 02 '17 at 08:00

I had some problems with changing the screen brightness in viewDidLoad/viewWillDisappear so I created a singleton class to handle all the action. This is how I do it:

import Foundation
import UIKit

final class ScreenBrightnessHelper {

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

    private init() { }

    static let shared = ScreenBrightnessHelper()

    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()
    }

    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
    }
}

How can we programmatically change the brightness of the iPhone screen?

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