title: CATextlayer change size of FONT to fit the frame
body: <p>I have a <code>CATextlayer</code> of a certain size and <code>NSAttributedString</code> text of unknown length.</p>
  
  <p>I need to adjust the font-size so the text fits the frame (not vice versa :)</p>
  
  <p>Any ideas where to start? :)</p>
  
  <p>[Edit] as nall points out, I can determine the string length, of course, it's some text entered by the user that I need to fit into a box of fixed size.</p>