title: iOS force a subview to have flexible height
body: <p>I have a scroll view that I want to be able to compress or expand based on the device. Right now I can get the page to look okay in iPhone &amp; 3.5" Retina OR 4" Retina but not all three. I have tried playing with Content Hugging Priority and Content Compression Resistance Priority as well as mucking with all the related constraints. So far NOTHING seems to have an affect on layout. Does iOS ignore all those settings? It's driving me crazy trying to figure this out.</p>