title: Xib based view is always full-screen and displayed on top of all other views
body: <p>This is a generic question and I must be missing something simple.</p>
  
  <p>I've create a xib file, put a few views in it, created a view class inherited from UI view, defined initWithCoder and initWithFrame, set File's Owner of the xib to this class. The view class loads the xib via <code>loadNibNamed</code>. I add this custom view to storyboard to a view which takes half of the screen. The view appears correct on the storyboard, I can set constraints for it, but when the app runs, the view is actually taking a full screen. It is not appearing inside the view I've added it to.</p>
  
  <p>What am I doing wrong?</p>