Cocoa Notification Example

Can someone please show me an example of a Cocoa Obj-C object, with a custom notification, how to fire it, subscribe to it, and handle it?

From stackoverflow

• @implementation MyObject
  
  // Posts a MyNotification message whenever called
  - (void)notify {
    [[NSNotificationCenter defaultCenter] postNotificationName:@"MyNotification" object:self];
  }
  
  // Prints a message whenever a MyNotification is received
  - (void)handleNotification:(NSNotification*)note {
    NSLog(@"Got notified: %@", note);
  }
  
  @end
  
  // somewhere else
  MyObject *object = [[MyObject alloc] init];
  // receive MyNotification events from any object
  [[NSNotificationCenter defaultCenter] addObserver:object selector:@selector(handleNotification:) name:@"MyNotification" object:nil];
  // create a notification
  [object notify];
  

  For more information, see the documentation for NSNotificationCenter.

• Step 1:

  //register to listen for event    
  [[NSNotificationCenter defaultCenter]
    addObserver:self
    selector:@selector(eventHandler:)
    name:@"eventType"
    object:nil ];
  
  //event handler when event occurs
  -(void)eventHandler: (NSNotification *) notification
  {
      NSLog(@"event triggered");
  }
  

  Step 2:

  //trigger event
  [[NSNotificationCenter defaultCenter]
      postNotificationName:@"eventType"
      object:nil ];