Yes it is possible. NSNotificationCenter works exactly in that way.
Firstly, you will have to register the listener in the first view controller as below.
-(void)viewDidLoad
{
[super viewDidLoad];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(somethingHappens:) name:@"notificationName" object:nil];
}
-(void)somethingHappens:(NSNotification*)notification
{
}
Secondly, post the notification from the second view controller as below.
[[NSNotificationCenter defaultCenter] postNotificationName:@"notificationName" object:obj];
The system will broadcast the notification to all the listeners.
