title: UIView transform, autolayout and anchor point
body: <p>I'm using ios 9 sdk. I created this view hierarchy setup with autoloayout:</p>
  
  <pre><code>----- Top
    | 30
  ----- CustomView (A)
    |
    |
  -----
    | 0
  ----- Bot
  </code></pre>
  
  <p>I'm trying to create a second CustomView (call it B) behind the first (call it A), scaled by 80% in both directions, and above A by 5 points. So only the top of B is visible.</p>
  
  <p>This should be easy, but it is not. Applying a -5 points translation and a .8 scaling on B moves B down instead of up, because autolayout seems to use the anchor point (set to middle by default) to position B: it seems it detects that a scaling has been applied and recenters B vertically - moving it down.</p>
  
  <p>Changing the Anchor point to (x=0.5,y=1) moves A and B up by half their size, i don't understand why. So it does not fix the problem.</p>
  
  <p>Any idea ?</p>
  
  <p>Edit: some code</p>
  
  <pre><code>var card = new CardView();
  InsertSubview(card, 0);
  
  card.TranslatesAutoresizingMaskIntoConstraints = false;
  this.AddConstraints(
              card.AtTopOf(this, 30),
              card.WithSameWidth(this).WithMultiplier(.95f),
              card.WithSameCenterX(this),
              card.AtBottomOf(this)
              );
  
   var transform = CGAffineTransform.MakeTranslation(0, -10);
   transform.Scale(.8f,.8f);
   Transform = transform;
  </code></pre>
  
  <p>Result: card is not at 20pts from top, it is at about 50pts, beside its original position of 30pt.</p>