title: Does it matter which superview I add constraints to?
body: <p>Let say I have 3 views</p>
  
  <pre><code> A|----------|
    | B|-----| |
    |  | C ▢ | |
    |  |_____| |
    |__________|    
  </code></pre>
  
  <p>If I have a constraint involving view B and view C.  </p>
  
  <p>The <a href="http://developer.apple.com/library/ios/documentation/UIKit/Reference/UIView_Class/UIView/UIView.html#//apple_ref/occ/instm/UIView/addConstraint%3a" rel="nofollow">documentation</a> suggests adding to view C would be illegal:</p>
  
  <blockquote>
    <p>The constraint must involve only views that are within scope of the receiving view. Specifically, any views involved must be either the receiving view itself, or a subview of the receiving view. Constraints that are added to a view are said to be held by that view. The coordinate system used when evaluating the constraint is the coordinate system of the view that holds the constraint.</p>
  </blockquote>
  
  <ul>
  <li>Does it matter if I add it to view A or view B?  </li>
  <li>Are there any implications of adding to one superview instead of the other?</li>
  <li>Are there any convenience implications? (e.g. its easier to manage if all constraints are in one place?)</li>
  </ul>