What UIViewController method is called when opening app from background?

Question

Hi,

Is there any conventient way of determining if a view is being loaded from the app being in background mode?

In 3.X I would rely on viewDidLoad to do some initalization etc., this however is not the case for 4.X, as you cannot rely for the viewDidLoad method to be called.

I would like to avoid putting in extra flags to detect this in the appdelegate, I would rather use a reliable way of doing this in the UIViewController, but cannot seem to find anything in the lifecycle of a UIViewController that could help me out here.

Any ideas? How do you handle such situations?

Answer 1

- (void)viewWillAppear:(BOOL)animated

but not

- (void)viewDidLoad

The Application Delegate Method

- (void)applicationWillEnterForeground:(UIApplication *)applicationUIApplicationDelegate

will be called after the the application entered the foreground though you can add an observer for the UIApplicationWillEnterForegroundNotification in any of your views.