title: iOS: How to find insertion position in sorted NSMutableArray
body: <p>I have an NSMutableArray of sorted objects, which are displayed in a UITableView.</p>
  
  <p>I want to insert a new object into the array and update the table view - which requires the index of the newly inserted object.</p>
  
  <p>I can't find any system message to tell me the correct insertion index into the array which I need to update the table view.</p>
  
  <p>The best I can find is:</p>
  
  <ul>
  <li>add new object</li>
  <li>sort</li>
  <li>using old copy of array, find the location of the new object (which requires searching)</li>
  </ul>
  
  <p>or</p>
  
  <ul>
  <li>write my own search for insertion position</li>
  </ul>
  
  <p>Surely, there must be a message to find the insertion position in a sorted array? Or am I missing something obvious here?</p>