Auto lock does not function when app left open - iOS

Question

I'm developing a messaging app and auto lock doesn't function when app left open. (No single line is related to auto lock in code)

I've used this line to enabling it,

[[UIApplication sharedApplication] setIdleTimerDisabled:NO]; 

but its not working.

Any idea how to get this done?

Answer 1

For anyone who is facing the same issue.

The device will not lock when you are running app through X-code either debugging or not. Once app is installed you have to detach it from X-code( just remove the attached cable ), it will work for you.

Answer 2

For others who may encounter this, in my case, it was the AVPlayer who prevented the display from going to sleep. To solve this, use the preventsDisplaySleepDuringVideoPlayback property of AVPlayer:

    let player = AVPlayer()
    player.preventsDisplaySleepDuringVideoPlayback = false