title: centering placeholder in the same UITextField, but of two different sizes
body: <p>I am trying to have the same placeholder text centered in two different sizes of the same <code>UITextField</code>.</p>
  
  <p>The <code>UITextField</code> in question is 243 wide in Portrait and 360 in Landscape.</p>
  
  <p>When in Portrait the placeholder centers in the middle just fine. When I rotate to Landscape and the <code>UITextField</code> gets redrawn bigger, it is no longer centered. It's like 25% to the left (I am guessing in the middle of the Portrait length)</p>
  
  <p>Is there any way to re-center the placeholder every time the length of a <code>UITextField</code> changes ?</p>