I am developing an iPhone application for a university project and I'm new to iPhone development. I have looked through Apple's MapCallouts code but it doesn't seem feasible to implement it.

So far my code displays a map, drops annotations, displays the title and it displays the right call out button. But this is where I encounter problems.

When I press on the callout button, it displays a blank view controller but it should display a different image for every callout that's tapped and this isn't happening so far.

I have added my code below:

- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view 
        calloutAccessoryControlTapped:(UIControl *)control
{
    //NSUInteger tag = ((UIButton *)control).tag;

    if (self.detailController==nil)
    {
        DetailViewController* detailViewController = [[DetailViewController alloc] init];
        [self.navigationController pushViewController:detailViewController animated:YES];            
    }

   // self.detailController.tag =1; //to identify image required
   // self.detailController.tag = tag;

    [self.navigationController pushViewController:detailController animated:YES];
}