title: move single MKCircle among multiple circles on map in objective c
body: <p>I have to move or resize one MKCircle among multiple circles on map. I am able to do if I have only single circle on map. I am getting circle radius and its latitude, longitude through web services. Is there any Id property of circle or how can I create multiple objects of circle? For single circle, I am writing below code:</p>
  
  <pre><code> if(circle != nil)
          {
              [_mapView removeOverlay: circle];
              circle = nil;
          }
      if (circle == nil) {
           circle=[MKCircle circleWithCenterCoordinate:coord radius:radius];
          [self.mapView addOverlay:circle];
      }
  </code></pre>
  
  <p>Please help me what should I do code if I have more than one circle?</p>