title: How to show a Validation error on UITextField?
body: <p>I want to create an error on a textfield validation very similar to this one:</p>
  
  <p><a href="https://i.stack.imgur.com/b1DfJ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/b1DfJ.png" alt="enter image description here"></a></p>
  
  <p>I understood there is some native iOS red icon that I can show on the validation error?</p>
  
  <p>How can I achieve something like that?</p>
  
  <p>Do you know of a library or a piece of code to achieve that?</p>