title: How to set focus to an iOS text field?
body: <p>How do you programmatically set focus to some UITextField in iOS?</p>
  <p>When you tap on a textfield, the keyboard pops up to begin editing the textfield.</p>
  <p>How can you give focus to a textfield and bring up the keyboard <em>without</em> requiring the user to tap on the textfield?</p>