title: layoutSubviews isn't called for UIView that has NIB-subviews with Auto Layout
body: <p>I work with iOS 6. I created a custom sub-class of <code>UIView</code> that has my own layout logic described in overridden <code>layoutSubviews</code> method. I expect to support both Portrait and Landscape modes so invocation of <code>layoutSubviews</code> is critical for me. I re-arange and resize sub-views programmatically inside <code>layoutSubviews</code> without using any constraints.</p>
  
  <p>Everything works fine if I operate with simple controls or UIViews added as sub-views into my custom sub-class. But if I add at least one NIB-based sub-view that has Auto Layout with some constraints then <code>layoutSubviews</code> is never called on rotation in my sub-class and therefore I can't update the layout.</p>
  
  <p>This is probably something very simple, but I couldn't find the solution here and since I am new to iOS can't figure by myself. Please help.</p>