title: Uninstalled IB Property in storyboard vs. superview property
body: <p>I am having trouble understanding the nuances of setting a view to <em>not installed</em> in the storyboard.
  <a href="https://i.stack.imgur.com/Lhkns.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Lhkns.png" alt="enter image description here"></a></p>
  
  <p>As far as I understood, this property is the equivalent of adding/removing the view from its superview. So the <code>myView.superview</code> property.</p>
  
  <p><strong>But</strong> it seems that constraints, that the view itself has (not from the superview, so e.g. width/height) are lost, when the view is set to <em>not installed</em> in the IB, but referenced as an IBOutlet and added to the view hierarchy later. 
  <strong>On the other hand</strong> leaving it <em>installed</em> in IB and removing then adding it again preserves the width/height constraints.</p>
  
  <p>Thus <em>installed</em> and <code>.superview</code>  cannot be equivalent. What is the deal here?</p>