title: MKAnnotationView in both hovering and pinned states
body: <p>I'm trying to add a pin (MKAnnotation and MKAnnotationView) to my MKMapView and allow the user to drag it around.</p>
  
  <p>I'd also like to make the dragging of the pin animated and interactive like the iPhone's Map App.</p>
  
  <p>My question is how do I change the state of the MKAnnoationView so that it's hovering over the map (so the pin isn't actually inside the map)? </p>
  
  <p>I'm not 100% sure how to do this.</p>
  
  <p>At present, my colleague as found an hovering image that he swaps with the default MKAnnotationView, but that means I can't easily animate between the two.</p>