title: With Auto Layout, how do I make a UIImageView's size dynamic depending on the image?
body: <p>I want my <code>UIImageView</code> to grow or shrink depending on the size of what the actual image it's displaying is. But I want it to stay vertically centered and 10pts from the leading edge of the superview.</p>
  
  <p>However, if I set these two constraints it complains I haven't set up enough constraints to satisfy Auto Layout. To me it seems to perfectly describe what I want. What am I missing?</p>