How to use NSNotification

Question

In my application there is two viewControllers as FirstViewController and DetailViewController. When tap on a table cell, it navigate to Det

Answer 1

post the notification from detailViewController and add firstViewController as the observer.

Make sure you remove fireViewController from the observer list from viewDidUnload.

Right now you are adding detailViewController as observer.

Answer 2

-(void)viewDidLoad {

[NSNotificationCenter defaultCenter];
NSNotification* notification = [NSNotification notificationWithName:@"MyNotification" object:self];
[[NSNotificationCenter defaultCenter] postNotification:notification];  

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

}


-(IBAction) save{

[[NSNotificationCenter defaultCenter] postNotificationName:MyNotification object:sender];

//this will go to where you implement your selector objFirstViewController.

}

-(void)objFirstViewController:(NSNotification *)notification {

}