title: A way to tell when the user is done typing on a timed interval?
body: <p>I am wondering if there is a way to tell if the user hasn't typed in the <code>UITextField</code> say for 2 seconds. </p>
  
  <p>If that's not possible, I'd like to know if there is a way to tell if the user made an error typing in the text field - example:</p>
  
  <p>There is a <code>UITextView</code> which contains objects from an <code>NSArray</code> and the user has to type in the textfield and match the content on the text view. If they make a mistake, it will tell them (what I need help with) - Note: if the user types the string correctly, it automatically accepts it and goes on to the next one - there is no button to submit the string - it does that via the text field.</p>