title: MKMapView set maximum zoom
body: <p>I am rendering a building's indoor map into <code>MKMapView</code> using overlays. The building is quite small in top view. I set the desired span using</p>
  
  <pre><code>[mapView setRegion:region animated:NO];
  </code></pre>
  
  <p>so that building can be seen in detail.
  I want to let the user zoom out and then zoom in back using pinch,
  but when the user scales the map with a pinch gesture, it zooms out and cannot be zoomed in back. So I only can zoom in back programmatically calling <code>mapView setRegion:animated:</code> again.</p>
  
  <p>Is it possible to achieve what I want? Thanks.</p>