title: Order the tableview cell by the subtitle
body: <p>i'm getting the distance of 2 points like this</p>
  <pre><code>[userLocation distanceFromLocation: annotationLocation] / 1000;
  </code></pre>
  <p>and setting this to the subtitle of a tableview like the image bellow
  <a href="https://i.stack.imgur.com/qj433.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/qj433.png" alt="screenshot" /></a></p>
  
  <p>the question is, can i order this table by the distances (subtitle)?</p>
  <p>Thanks!</p>
  <p>and sorry for the bad english =x</p>