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let nc = NotificationCenter.default // Note that default is now a property, not a method call
nc.addObserver(self,
  selector: #selector(handleNotification),
  name: NSNotification.Name(rawValue: AppConstants.Notifications.ARASAACPicto),
  object: nil);
                           
                           
                           
let nc = NotificationCenter.default // Note that default is now a property, not a method call
nc.removeObserver(self, name: NSNotification.Name(rawValue: AppConstants.Notifications.ARASAACPicto), object: nil)
            
            
            
            
          let nc = NotificationCenter.default
        nc.post(name:NSNotification.Name(rawValue: AppConstants.Notifications.ARASAACPicto),
                object: nil,
                userInfo: ["selectedPicture":selectedPicture as Any])          
            
                           


    @objc func handleNotification(notification: NSNotification){
        imageType = AppConstants.ImageType.ARASAAC;
        categoryPicture = notification.userInfo!["selectedPicture"] as? Picture;
    }

En el viewController
1) para suscribir:

-(void) viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(receivedRemoteCommandCenterNotification)
                                                 name:REMOTE_COMMAND_CENTER_NOTIFICATION
                                               object:nil];
}

2) para desuscribir:
-(void) viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

SI SE QUIERE ELIMINAR LA NOTIFICACION EN CONCRETO (NO TODAS):
    [[NSNotificationCenter defaultCenter] removeObserver:self name:REMOTE_COMMAND_CENTER_NOTIFICATION object:nil];


3) para lanzarla desde cualquier punto:

    [[NSNotificationCenter defaultCenter]
     postNotificationName:REMOTE_COMMAND_CENTER_NOTIFICATION
     object:self];