targeting a view controller within another view controller

Usually, when I want to set the variable of another view controller within a specific view controller, I do this:

Code:

 - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
 {
           MyOtherViewController *_vc = [segue destinationViewController]; 
          [_vc setUser:current_user];
}

Now here's my problem. I am not using the prepareForSegue method in the case where a user clicks an annotation on mapkit:

Code:

- (void)mapView:(MKMapView *)mapView 
 annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control {
    
    NSLog(@"my current report is %@", view.annotation);

    if ([(UIButton*)control buttonType] == UIButtonTypeDetailDisclosure){
        [self performSegueWithIdentifier:@"ShowRemoteDetailViewManagerController" sender:self];        
    }
}

So in the above case, I have no access to a segue parameter to target the destination controller to set the view.annotation as the value of one of its methods. So how would I target the destination controller in the above example?

thanks for response