title: Objective-C/Xcode - password checking as user types
body: <p>I would love to do something to reward the user visually when they match two text fields as they type. This is jQuery-esque, and I'm not sure if it's possible in Objective-C/Xcode. The key here is "AS THEY TYPE". Some web-based user account setup forms show a green checkbox when the password/confirmPassword (mainly because of the secure field formatting •••••) or email/confirmEmail form fields match or turn into a red "X" if the passwords lose their match. </p>
  
  <p>Is there anything similar to an onKeystroke event in Objective-C/Xcode?</p>
  
  <p>I'm willing to research and learn this. I just don't know how to correctly reference this type of functionality.</p>