How can I prevent the display on an iOS device from dimming and turning off?

Question

I'm diving into iOS development and am building my own alarm clock app to become familiar with platform and SDK. I've noticed some alarm clock apps in the app store keep the screen from dimming and/or turning off when their app is running. How is this implemented?

score 194 · Accepted Answer · edited May 23 '20 at 00:38

194

Add this line of code on your application delegate:

Objective-C:

[[UIApplication sharedApplication] setIdleTimerDisabled:YES];

Swift 2:

UIApplication.sharedApplication().idleTimerDisabled = true

Swift 3, 4 & 5:

UIApplication.shared.isIdleTimerDisabled = true

edited May 23 '20 at 00:38

PhillipJacobs

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answered Aug 08 '10 at 22:14

Iñigo Beitia

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You can use this in swift as UIApplication.sharedApplication().idleTimerDisabled = true – Vettiyanakan Mar 27 '15 at 07:01
not run when app add view UIImagePickerController, app will auto dim when remove subview – vualoaithu Nov 15 '17 at 04:12

How can I prevent the display on an iOS device from dimming and turning off?

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