title: vertically align text in a CATextLayer?
body: <p>I am working on a CATextLayer that I want to use in both Mac and iOS.  Can I control the vertical alignment of the text within the layer?</p>
  
  <p>In this particular case, I want to center it vertically -- but information about other vertical alignments would also be of interest.</p>
  
  <p>EDIT: I found <a href="http://lists.apple.com/archives/quartz-dev/2008/Aug/msg00016.html" rel="noreferrer">this</a>, but I can't make it work.</p>