title: iOS: Make a UITextField like WhatsApp Verification Code TextField?
body: <p>My problem is that I want to make a <code>UITextField</code> like WhatsApp verification code textField(like below image).Where default value contains number of character to be entered(as hint for user). When user enter text replace hint character with entered character one by one?</p>
  
  <p><a href="https://i.stack.imgur.com/73QnP.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/73QnP.jpg" alt="enter image description here"></a></p>
  
  <p>Any help is much appreciated.</p>