How to disable iPhone/iPad auto-lock while app is in foreground mode?

Question

I'm developing an music/video player app and just need to konw how to disable the auto-lock while my app is in foreground.

I know I've to use [[UIApplication sharedApplication] setIdleTimerDisabled:YES]; and [[UIApplication sharedApplication] setIdleTimerDisabled:NO]; at some point, but where is the best place to put them?

Answer 1

Enable the idle timer in

- (void)applicationWillResignActive:(UIApplication *)application 

and disable it in

- (void)applicationDidBecomeActive:(UIApplication *)application 

Answer 2

The best place to disable it is in didFinishLaunchingWithOptions. The system will automatically take care of making the setting have no effect when the app is in the background.

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {     application.idleTimerDisabled = YES;      return YES; } 

I posted this alternative because the accepted answer does not prevent auto-lock when an alert appears (email, message, calendar event etc), or the notification center or control center is up.