how to use the object property of NSNotificationcenter

Question

Could somebody please show me how to use the object property on NSNotifcationCenter. I want to be able to use it to pass an integer value to my selector method.

This

Answer 1

The object property is not appropriate for that. Instead you want to use the userinfo parameter:

+ (id)notificationWithName:(NSString *)aName 
                    object:(id)anObject 
                  userInfo:(NSDictionary *)userInfo

userInfo is, as you can see, an NSDictionary specifically for sending information along with the notification.

Your dispatchFunction method would instead be something like this:

- (void) disptachFunction:(int) index {
    NSDictionary *userInfo = [NSDictionary dictionaryWithObject:[NSNumber numberWithInt:index] forKey:@"pass"];
   [[NSNotificationCenter defaultCenter] postNotificationName:@"myevent" object:nil userInfo:userInfo];
}

Your receiveEvent method would be something like this:

- (void)receiveEvent:(NSNotification *)notification {
    int pass = [[[notification userInfo] valueForKey:@"pass"] intValue];
}