title: How to change dynamically the xib of a UIVIewController
body: <p>I have an UIVIewController "controller1" for instance. This controller is instanciated with initWithNibName... with "file1.xib".
  I want to dynamically change the xib file of my "controller1" to "file2.xib"</p>
  
  <p>To resume : </p>
  
  <p>"controller1" &lt;-> "file1.xib"
  and I want to dynamically have :
  "controler1" &lt;-> "file2.xib"</p>
  
  <p>How can I do this ?</p>
  
  <p>Hope I was clear.</p>