MapView MKAnnotation not showing callout on MKMapView - iphone

Question

I'm displaying a few map pins on a map view. I can't figure out why the callout won't show when an annotation is touched. Here's my code. I have some conditional code in the viewDidLoad method to display a different pin image depending on a category id. The custom pins display correctly, but when you touch them nothing happens.
thanks for any help with this.
- (void)viewDidLoad {
[super viewDidLoad];
[self requestData];
CLLocationCoordinate2D centerCoord = CLLocationCoordinate2DMake(44.2632, 11.4403);
MKCoordinateSpan span;
span.latitudeDelta=5;
span.longitudeDelta=5;
MKCoordinateRegion ITRegion = MKCoordinateRegionMake(centerCoord, span);
ITRegion.span=span;
[mapView setRegion: ITRegion animated: YES];
mapView.delegate=self;
[self.mapView setShowsUserLocation:YES];
for (int i=0; i<[publicDataArray count]; i++) {
MKPointAnnotation* annotation= [MKPointAnnotation new];
CLLocationCoordinate2D coordinate;
coordinate.latitude = [[[[publicDataArray objectAtIndex:i] objectForKey:#"address"] objectForKey:#"lat"] doubleValue];
coordinate.longitude = [[[[publicDataArray objectAtIndex:i] objectForKey:#"address"] objectForKey:#"lng"] doubleValue];
NSString *catId = [NSString stringWithFormat:#"%#",[[publicDataArray objectAtIndex:i] objectForKey:#"category_id"]];
if ([catId isEqual: #"213"]) {
annView.image = [UIImage imageNamed:#"comprareMap.png"];//sets image for pin
} else if ([catId isEqual:#"217"]) {
annView.image = [UIImage imageNamed:#"vedereMap.png"];//sets image for pin
} else if ([catId isEqual:#"221"]) {
annView.image = [UIImage imageNamed:#"mangiareMap.png"];//sets image for pin
}
annotation.coordinate = coordinate;
[mapView addAnnotation: annotation];
}
}
- (MKAnnotationView *) mapView:(MKMapView *)mapingView viewForAnnotation:(id <MKAnnotation>) annotation {
annView = nil;
if(annotation != mapingView.userLocation)
{
static NSString *defaultPinID = #"";
annView = (MKAnnotationView *)[mapingView dequeueReusableAnnotationViewWithIdentifier:defaultPinID];
if ( annView == nil )
annView = [[MKAnnotationView alloc]
initWithAnnotation:annotation reuseIdentifier:defaultPinID] ;
UIButton* rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
[rightButton setTitle:annotation.title forState:UIControlStateNormal];
[rightButton addTarget:self
action:#selector(showDetails:)
forControlEvents:UIControlEventTouchUpInside];
annView.rightCalloutAccessoryView = rightButton;
annView.canShowCallout = YES;
}
return annView;
}