title: MKMapView refresh after pin moves
body: <p>A custom AnnotationView is updated with new coordinates. But the problem is that it visually updates only after some manipulations with MKMapView, e.g. zooming or moving.
  What should I do to manually update visual position on a map?</p>
  
  <p>PS. I've tried to change region to current map's region. But it does change zoom. It's strange.</p>
  
  <pre><code>[mapView setRegion:[mapView region] animated:YES];
  </code></pre>