NSNotification example

nsnotification.m

- (void) subscribeNotificationWithName: (NSString*) name {
    [ [NSNotificationCenter defaultCenter ] addObserver: self
                                               selector: @selector(didReceiveNotification:)
                                                   name: name
                                                 object: nil ];
}

- (void) didReceiveNotification: (NSNotification *) notification {
    NSLog(@"didReceiveNotification");

    NSString *title = (NSString*)notification.object;
    NSDictionary *info = notification.userInfo;
    NSString *message = [info objectForKey: @"error.message"];
}

- (void) postNotification {
    NSDictionary *info = [NSDictionary dictionaryWithObject: ErrorMessage
                                                     forKey: @"error.message"];
    [[NSNotificationCenter defaultCenter] postNotificationName: @"some message"
                                                        object: @"Connection Status"
                                                      userInfo: info];
}