title: IPhone Key board is not responding
body: <p>In the <code>viewdidload</code> method, I've assigned one of my text fields as first responder by the following way.</p>
  
  <pre><code>[txtUsername becomeFirstResponder];
  </code></pre>
  
  <p>When the view gets loaded, the text field becomes active and a keyboard appears. But when I tried typing on the keyboard, it is not responding. However when I touched the text field, the keyboard is responding properly. I don't know what is wrong with this. can anyone give me a suggestion?</p>
  
  <p>Thanks in Advance - Abilash</p>