Question

I have a viewcontroller that needs to be reloaded when the app comes out of the background. I would just need this single viewcontroller to completely reload. I dont need to do anything If the app becomes active on any of the other viewcontrollers. Any ideas?

Answer 1

Have the view controller register for the UIApplicationWillEnterForegroundNotification notification or perhaps the UIApplicationDidBecomeActiveNotification.

In viewDidLoad you can do:

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

In dealloc you need to unregister:

[[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationWillEnterForegroundNotification object:nil];

And you need to implement the foregrounded method:

- (void)foregrounded {
    // app now in the foreground - do something
}