MapKit blue dot not visible when using custom annotations - iphone

Question

I am not able to see the Blue current location dot when I use custom annotations
- (MKAnnotationView *) mapView:(MKMapView *) mapView viewForAnnotation:(id<MKAnnotation> ) annotation {
   MKAnnotationView *customAnnotationView=[[[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:nil] autorelease];
   UIImage *pinImage = [UIImage imageNamed:#"ann.png"];
   [customAnnotationView setImage:pinImage];
   customAnnotationView.canShowCallout = YES;
                                                                                               
//UIImageView *leftIconView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"ann.png"]];
//customAnnotationView.leftCalloutAccessoryView = leftIconView;
UIButton *rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
[rightButton addTarget:self action:#selector(showDetails:) forControlEvents:UIControlEventTouchUpInside];
customAnnotationView.rightCalloutAccessoryView = rightButton;
   return customAnnotationView;
}

Answer 1

if (annotation == map.userLocation) {
return nil;
}
Add this.:d

Answer 2

I got the answer now. Just need to add the following lines to the above code at the end just before return customAnnotationView;
if (annotation ==
mapView.userLocation) {
NSLog(#"nil"); return nil; }
thanks :)

Answer 3

The visibility of the current user location "blue dot" is unrelated to custom annotations. To make the user's current location show, you need to set the showsUserLocation property of your MKMapView to YES. For example:
yourMapView.showsUserLocation = YES;
or:
[yourMapView showsUserLocation] = YES;
Understand that there is a quirk in the way MapKit displays the current user location: in the simulator the UserLocation will always be Apple's headquarters in Cupertino, CA, USA. It will work fine on the device, however.
Edited to add:
As Terente points out, you do have to be careful not to "eat" the user's location annotation, and so must test to see if the annotation you're processing is the user's location. I wrap the logic with:
if ([annotation isKindOfClass:[MapLocation class]]) {
}
Where MapLocation is my annotation class.