Disable automatic screen lock in iOS 5.1

问题:

The following line of code prevents the app from automatically locking the screen after some idle time.

[UIApplication sharedApplication].idleTimerDisabled = YES; //write this in applicationDidFinishLaunching

It works well till iOS 5.0. But iOS 5.1 does not respect this line and locks the screen after some idle time. How to solve this irritating issue?

Thanks.

Edit:

The same code works fine when its installed in 5.0.1 device. But I dont know why it is not working with 5.1 device.

回答1:

Just setting [UIApplication sharedApplication].idleTimerDisabled = YES; in

- (BOOL) application:(UIApplication*)application didFinishLaunchingWithOptions:(NSDictionary*)launchOptions

works well for me. However, there is a caveat. I have noticed that every time I invoke camera utility to take a snapshot, idleTimerDisable gets set to NO behind the scene. So right after I upload my image, I had to call the following line of code again:

[UIApplication sharedApplication].idleTimerDisabled = YES;

I would not be surprised if there are more places throughout that require same strategy. So far this approach has worked without issues for me.

回答2:

[[UIApplication sharedApplication] setIdleTimerDisabled: YES];

worked for me on iOS 5.1

回答3:

No there should be no difference. Perhaps you have another mistake..
See iOS 5.0 to 5.1 API Diffs

回答4:

Important: You should set this property only if necessary and should be sure to reset it to NO when the need no longer exists. Most applications should let the system turn off the screen when the idle timer elapses. This includes audio applications. With appropriate use of Audio Session Services, playback and recording proceed uninterrupted when the screen turns off. The only applications that should disable the idle timer are mapping applications, games, or similar programs with sporadic user interaction.

Maybe You exceeds the allowable time limit of being awake?

回答5:

i know its is old, but i found this good and in Swift you can do it look a like this

application.idleTimerDisabled = true

Thanks for you answers! i use right now xcode 7 Beta 3 ( Swift 2 )

回答6:

Works fine if your application is registered for some background task, for example GPS location updating.

回答7:

For Swift, I use this to do outside of delegate:

    UIApplication.sharedApplication().idleTimerDisabled = true