title: Don't dismiss UIAlertView (without subclassing)
body: <p>I am using a <code>UIAlertView</code> to prompt users for a password.  If the password is correct, I'd like the alert view to go away normally; if the password is incorrect, I'd like the alert view to remain (with the text changed to something like "Please try again.").  How do I alter the default behaviour so that the view doesn't go away when a button is pressed?</p>
  
  <p>I've tried the subclassing method suggested at <a href="https://stackoverflow.com/questions/2051402/is-it-possible-to-not-dismiss-a-uialertview">Is it possible to NOT dismiss a UIAlertView</a>, but the <code>dismissWithClickedButtonIndex</code> wasn't being called in my subclass.  After reading the documentation I see that subclassing <code>UIAlertView</code> isn't supported, so I'd like to try another approach.</p>
  
  <p>If this isn't possible with <code>UIAlertView</code>, is the best option to simply make a password view from scratch?  Thanks for reading.</p>