title: Reload or Refresh the MKMapView based on the different preferences or sort types
body: <p>I have an application where the map view has several pins and annotations. These pins should refresh or reload based on the various sort options I have on my view. e.g. The pins represent various buildings, and the filter options are like, Library, Museum, Movie Theater, All Attractions, etc.</p>
  
  <p>I have tried using</p>
  
  <pre><code>[MapView reloadInputViews];
  </code></pre>
  
  <p>based on the filtered array after choosing an option. But it simply does not work for me. Any ideas how this would be implemented?
  Thanks in advance!</p>