title: characterIndexAtPoint in IOS
body: <p>I'm new to objective-c, and I've done this in Flex/Actionscript, but hitting a wall with IOS.  Is it possible to get the index of a character under a point(x,y) in a TextField or Label and then be able to modify that single character in IOS?  </p>
  
  <p>I have a TapGestureRecognizer coming in with a point in my view.  I need to now be able to isolate and highlight just the character at the point coming in.</p>
  
  <p>For example if I have the text "Hello" on screen and I ask them to click on the 'e', I need to know which letter they touch and highlight it green/red depending on if they were right or not.</p>