title: Pulse of userLocation when hit an Annotation will show alert
body: <p>I've been able to increase the radius of user location annotation by using <a href="https://github.com/TransitApp/SVPulsingAnnotationView" rel="nofollow">https://github.com/TransitApp/SVPulsingAnnotationView</a> <br /> Now if I place a custom annotation on the map and if this pulse hits that notation I want to show something lets say an AlertView. <strong>How can I do that?</strong>
  Here is how I changed my default userLocation annotation.</p>
  
  <pre><code>- (MKAnnotationView *)mapView:(MKMapView *)mapView
              viewForAnnotation:(id&lt;MKAnnotation&gt;)annotation {
  
      if (annotation==(mapView.userLocation)) {
  
      static NSString *identifier = @"currentLocation";
      SVPulsingAnnotationView *pulsingView = (SVPulsingAnnotationView *)[self.mapView dequeueReusableAnnotationViewWithIdentifier:identifier];
  
      if(pulsingView == nil) {
          pulsingView = [[SVPulsingAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier];
          pulsingView.pulseScaleFactor= 40.0;//Change pulseScaleFactor as required
          pulsingView.outerPulseAnimationDuration = 1.5;
          pulsingView.canShowCallout = YES;
          pulsingView.centerOffset = CGPointMake(0, 250);
      }
  
      return pulsingView;
  
      }
      else return nil;
  }
  </code></pre>