iPhone UIView set resisting/position struts/springs programmatically

Question

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.

How can I programmatically replace the top strut for a UIView with a bottom strut? I know that springs can be added with

uiview.autoresizingmask = ...;

Answer 1

The autoresizingMask property also controls "struts". It sounds like you want to do this:

UIViewAutoresizing mask = myView.autoresizingMask;
mask &= ~UIViewAutoresizingFlexibleBottomMargin;
mask |= UIViewAutoresizingFlexibleTopMargin;
myView.autoresizingMask = mask;