title: Programmatically change UITextField Keyboard type
body: <p>Is it possible to programmatically change the keyboard type of a uitextfield so that something like this would be possible:</p>
  
  <pre><code>if(user is prompted for numeric input only)
      [textField setKeyboardType: @"Number Pad"];
  
  if(user is prompted for alphanumeric input)
      [textField setKeyboardType: @"Default"];
  </code></pre>