title: How move the camera to Annotation?
body: <p>Huy Guys, i need you. 
  There is a method for the event in swift where I can move the camera ( focus) in the map to move from annotation to annotation?
  and if not exists how can i create this?
  Scuse me for my bad english! </p>
  
  <p>When i click on button to go to annotation i call this method and it is too fast....how i slow it? i pass the annotation like a parameter....</p>
  
  <pre><code>func goToAnnotation(annotation: MKPointAnnotation)
  {
      let span = MKCoordinateSpanMake(0.0002, 0.0002)
      let region = MKCoordinateRegion(center: annotation.coordinate, span: span)
      self.mapView.setRegion(region, animated: true)
  }
  </code></pre>