reverse geocoding with CoreLocation

gistfile1.m

-(void) addressFromLocation: (CLLocation *) aLocation{
    
    
    
    CLGeocoder *geocoder = [[CLGeocoder alloc] init];
    self.activity.hidden = NO;
    [self.activity startAnimating];
    self.output.text = @"Ahora lo averiguo. Contactando con Paco Lobatón...";
    [geocoder reverseGeocodeLocation:aLocation
                   completionHandler:^(NSArray *placemarks, NSError *error) {
                       if (placemarks && placemarks.count > 0) {
                           
                           CLPlacemark *placemark = [placemarks objectAtIndex:0];
                           self.output.text = [NSString stringWithFormat:@"%@ %@, %@ %@", 
                                               [placemark subThoroughfare], 
                                               [placemark thoroughfare], 
                                               [placemark locality],
                                               [placemark administrativeArea]];
                           self.background.image = [UIImage imageNamed:@"pacoLobaton.jpg"];
                           
                       }else{
                           self.output.text = @"Estás perdido. Llama a Lobatón";
                       }
                       [self.activity stopAnimating];
                       NSLog(@"%@", self.output.text);
                   }];
}