Question

Possible Duplicate:
Can I watch an NSNotification from another class?

I am currently using this code below in my appDelegate.m file:

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

[[NSNotificationCenter defaultCenter] addObserver: self
                                         selector: @selector(handleEnteredBackground:) 
                                             name: UIApplicationDidEnterBackgroundNotification
                                           object: nil];

}

However, I want it to call a selector in my viewController.m file. How can I do this?

Thanks!

Answer 1

Generally, you register the notification first, in your viewController.m init method (or somewhere else appropriate):

[[NSNotificationCenter defaultCenter] addObserver: self
                                         selector: @selector(someMethod:) 
                                             name: @"NotificationNameHere"
                                           object: nil];

In your App Delegate, fire the notification:

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

    [[NSNotificationCenter defaultCenter] postNotification: @"NotificationNameHere"];

}