title: How can I get the zoom level, latitude/longitude values, and center of the Map when zooming in/out?
body: <p>I am implementing an application based on the MapKit using the iPhone SDK. Now I just need a method to get the event when we drag, zoom in/out on the Map. The method is like this:</p>
  
  <pre><code>-(void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated
  </code></pre>
  
  <p>Now I need to get the following:</p>
  
  <ul>
  <li>Top left's and bottom right's latitude and longitude values.</li>
  <li>Center of the map.</li>
  <li>Zoom level.</li>
  </ul>
  
  <p>Please give me suggessions to solve the above 3 use cases.</p>