title: IOS event on uimap callout subview click
body: <p>I'm creating a map on IOS and on each annotation click I'm adding a custom subview like the following: </p>
  
  <pre><code>- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view {
  
      //load pin callout
      nearbyMapCallout *calloutView  = [[nearbyMapCallout alloc]init];
      calloutView = (nearbyMapCallout *)[[[NSBundle mainBundle] loadNibNamed:@"nearbyMapCallout" owner:self options:nil] objectAtIndex:0];
  
      CGRect calloutViewFrame = calloutView.frame;
      calloutViewFrame.origin = CGPointMake(-calloutViewFrame.size.width/2 + 37, -calloutViewFrame.size.height + 35);
      calloutView.frame = calloutViewFrame;
  
      [view addSubview:calloutView];
  
  }
  </code></pre>
  
  <p>So now how can I trigger an event when clicking a specific annotation callout subview ?</p>