Question

I’m trying to use NSNotification in my Storyboard.

This code work when I don’t use storyboard.

this is in ViewController1:

- (IBAction) buttonClickedListener2:(id)sender {
    [[NSNotificationCenter defaultCenter]
     postNotificationName:@"TestNotification"
     object:self];
}

And this is in ViewController2:

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
        [[NSNotificationCenter defaultCenter] addObserver:self
                                                 selector:@selector(receiveTestNotification:)
                                                     name:@"TestNotification"
                                                   object:nil];

        NSLog(@"initWithNib");
    }
    return self;
}

- (void) receiveTestNotification:(NSNotification *) notification
{
    // [notification name] should always be @"TestNotification"
    // unless you use this method for observation of other notifications
    // as well.

    if ([[notification name] isEqualToString:@"TestNotification"])
        NSLog (@"Successfully received the test notification!");
}

Is it anything wrong with the codes? As I said I want to make it work in my Storyboard.

I appreciate if you give me some toturials about how to use NSNotification in STORYBOARD.

Answer 1

Storyboards don’t use initWithNibName, so the part of your code where you add your observer doesn’t get run. You should be able to see this by setting a breakpoint. A fix would be to replace

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self){
        //statements
    }
    return self;
}

with

- (id)initWithCoder:(NSCoder *)aDecoder
{
    self = [super initWithCoder:aDecoder];
    if (self){
        //statements
    }
    return self;
}