Calling a method in my view when my application returns to foreground

Question

How do I call a method when my application comes back from the background?

I know there are methods that can be called in the app delegate, but I want to call a method in my view.

What is the best way of doing this?

Thanks in advance!

Answer 1

You should have your desired view controller register for UIApplicationWillEnterForegroundNotification notification, such as in initWithNibName:nibBundleOrNil:

- (id)initWithNibName(NSString *)nibNameOrNil bundle:(NSBundle*)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self)
    {
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(yourMethod:) name:UIApplicationWillEnterForegroundNotification object:nil];

        // Whatever else your init method should do here...
    }    

    return self;        
}

- (void)yourMethod:(NSNotification *)notification
{
    // whatever you want to do here...
}

Make sure you also unregister in dealloc:

- (void)dealloc
{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}