iphone - How to react to applicationWillResignActive from anywhere?

Question

What's the code to subscribe to an event like applicationWillResignActive in any place in your iphone application?

[UPDATE]

Let me rephrase my question. I don't want to respond to this in my application delegate, but rather listen to this event from another class. Is that possible or I need to pass the event from the application delegate to the concerning class?

Answer 1

Looks like you are looking for this code.

- (void) applicationWillResign {
    NSLog(@"About to lose focus");
}

- (void) myMethod { 
    [[NSNotificationCenter defaultCenter]
        addObserver:self
        selector:@selector(applicationWillResign)
        name:UIApplicationWillResignActiveNotification 
        object:NULL];
}