Question

I know that when iphone application goes to background, these methods are called:

- (void)applicationDidEnterBackground:(UIApplication *)application
- (void)applicationWillResignActive:(UIApplication *)application

what method(s) are called when application appears from background?

are there any methods in ViewController which are called?

thanks

Answer 1

Along with the applicationDidBecomeActive: and applicationWillEnterForeground: messages sent to the application delegate, the OS will also send corresponding UIApplicationDidBecomeActiveNotification and UIApplicationWillEnterForegroundNotification notifications.

You can have your view controller listen to these notifications:

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(appWillEnterForegroundNotification:) 
                                             name:UIApplicationWillEnterForegroundNotification 
                                           object:nil];

Don’t forget to remove yourself as an observer before your view controller gets destroyed.