title: UITextfield format ****user
body: <p>I want to add masked and unmasked characters, both together in <code>UITextfield</code>.</p>
  
  <p>e.g I have a <code>UITextField</code> called UserName "<strong>TestUser</strong>". Now I want to display username in the <code>UITextField</code> like "****User". Is it possible to add both text together? I want to do this thing while entering character in <code>UITextfield</code>. </p>