title: Check a Server for a matching UDID and autofill UITextField with matching Username
body: <p>This is my first post on here so be nice :) I am new to coding iOS and currently coding an app which uses a login system which communicates with the server and saves a users UDID. I need to app to check the UDID is on the server and if it matches to auto fill the Username UITextField in the login form. </p>
  
  <p>Please could someone help me out or point me in the right direction.</p>