Reverse Geocoding on MKMapView by dragging Pins - iphone

Question

I have a subclass "Location" of NSManagedObject and this class conforms to MKAnnotation.
When I add a Location to a Map...the ReverseGeocoder starts. By clicking the pin I see in the callout View the address of the pin. So everything works fine.
Now my problem.
I am able to drag the pins. When I am finished dragging, than again the ReverseGeocoder starts to ask for location Data. But I still have the old address in the callout view, although the placemarks are updated in the Location object. After dragging again I can see the new address. (of course the new one isn't new anymore, because I dragged).
Here is my code for the dragging state:
- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)annotationView didChangeDragState:(MKAnnotationViewDragState)newState fromOldState:(MKAnnotationViewDragState)oldState{
//if dragging ended
if (newState == MKAnnotationViewDragStateNone && oldState == MKAnnotationViewDragStateEnding) {
CLLocation *location = [[CLLocation alloc] initWithLatitude:annotationView.annotation.coordinate.latitude longitude:annotationView.annotation.coordinate.longitude];
[self geocodeLocation:location forAnnotation:annotationView.annotation];
[location release];
}
And the Code for my reverse geocoder delegate
- (void)reverseGeocoder:(MKReverseGeocoder*)geocoder didFindPlacemark:(MKPlacemark*)place
{
Location* theAnnotation = [self.map annotationForCoordinate:place.coordinate];
if (!theAnnotation)
return;
// Associate the placemark with the annotation.
theAnnotation.city = [place locality];
theAnnotation.zipcode = [place postalCode];
theAnnotation.street = [place thoroughfare];
DEBUGLOG(#"Place: %#", place);
// Add a More Info button to the annotation's view.
MKPinAnnotationView* view = (MKPinAnnotationView*)[self.map viewForAnnotation:theAnnotation];
if (view)
{
DEBUGLOG(#"SUBTITLE: %#", theAnnotation.subtitle);
view.leftCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
}
}
Any help would be wonderful. In the end the Maps App is best example for doing that by dragging.

Answer 1

I figured out.
Because of KVO I hust hace to set the subtitle of the Location object. So it gets displayed.
But because the subtilte is generated by
// Associate the placemark with the annotation.
theAnnotation.city = [place locality];
theAnnotation.zipcode = [place postalCode];
theAnnotation.street = [place thoroughfare];
I just had to do the following in my NSManagedObject Subclass.
- (void) setSubtitle:(NSString *)title{ //do nothing}