title: warning: local declaration of 'mapView' hides instance variable
body: <p>please, can anybody explain and help me how to fix that warning?? thx in advance.</p>
  
  <pre><code>-(void)mapView:(MKMapView *)mapView regionWillChangeAnimated:(BOOL)animated {
  
          mapRegion=mapView.region; //first warning
      }
      -(void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated  {
  
          newRegion=mapView.region; //second warning
          if(mapRegion.span.latitudeDelta&gt;newRegion.span.latitudeDelta||mapRegion.span.longitudeDelta&gt;newRegion.span.longitudeDelta)
              shouldAdjustZoom=NO;
  
      }
  </code></pre>