MKCircleRenderer fillcolour overlap issue

I am adding MKCircleRenderer to a map code for that is

- (MKOverlayRenderer*)mapView:(MKMapView*)mapView rendererForOverlay:(id <MKOverlay>)overlay
{
     MKCircle* circle = overlay;
        MKCircleRenderer *circleView = [[MKCircleRenderer alloc] initWithOverlay:circle];
       circleView.fillColor = [UIColor colorWithRed:1.0 green:0.0 blue:0.0 alpha:0.1];
      return circleView;

}

Here the issues is that when two circles overlap i do not want them to get "mixed" and display a darker color in the overlapping area as like this.

Can any one please advise any hint / solution to resolve this.