title: iPhone UIView set resisting/position struts/springs programmatically
body: <p>I have an interface which uses elements from both an .xib and programmatically added views. I"m trying to rotate the views. The .xib elements stay in position if I assign left and bottom struts, but the programmatically added elements lose their position relative to the bottom of the screen. </p>
  
  <p><strong>How can I programmatically replace the top strut for a UIView with a bottom strut?</strong> I know that springs can be added with </p>
  
  <pre><code>uiview.autoresizingmask = ...;
  </code></pre>