How to rotate my view-based app to the new interface orientation?
<p>I have a simple view-based app from that template. It has nothing else in there, only one UIButton.</p>

<p>When the device rotates, I want that button to be re-layoutet in such a way that it fits the width of the screen automatically. It has a margin of 20 points left and right, which should always remain the same.</p>
