How to trigger MKAnnotationView's callout view without touching the pin?

Question

I\'m working on a MKMapView with the usual colored pin as the location points. I would like to be able to have the callout displayed without touching the pin.

Answer 1

After trying a variety of answers to this thread, I finally came up with this. It works very reliably, I have yet to see it fail:

- (void)mapView:(MKMapView *)aMapView didAddAnnotationViews:(NSArray *)views;
{
    for(id currentAnnotation in aMapView.annotations) 
    {       
        if([currentAnnotation isEqual:annotationToSelect]) 
        {
            NSLog(@"Yay!");
            dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 0.3 * NSEC_PER_SEC), dispatch_get_current_queue(), ^
            {
                [aMapView selectAnnotation:currentAnnotation animated:YES];
            });
        }
    }
}

The block is used to delay slightly, as without it the callout may not be shown correctly.