How to handle time events on iOS?

Question

I'm coding an iPad app, and I have to change a graphic when the day changes to Sunday.

My straightforward solution is to check the day in the - (void)applicationDidBecomeActive:(UIApplication *)application or -(void)viewWillAppear:(BOOL)animated methods, and set a timer like every 10 mins to check if the day have changed to Sunday while the app is active.

Is there another, perhaps more efficient, way to handle this?

Answer 1

In your appliciation delegate, implement the following method: -(void)applicationSignificantTimeChange:(UIApplication *)application

This method is called when the day changes, or if the device's time has been changed in the background for whatever reason (such as changes to time zone).