Question

I have an app that has a local database and i wish to call a function when the app is called from background(i.e. when i recall it from the ‘task manager’) so that i may update my database from a web service. What is the method called and can i get it to execute in my app’s delegate?

Answer 1

Check applicationWillEnterForeground: and applicationDidBecomeActive methods in UIApplicationDelegate.

applicationWillEnterForeground

In iOS 4.0 and later, this method is called as part of the transition
from the background to the active state. You can use this method to
undo many of the changes you made to your application upon entering
the background. The call to this method is invariably followed by a
call to the applicationDidBecomeActive: method, which then moves the
application from the inactive to the active state.