title: Animation for drawRect drawings
body: <p>A part of my app is a statistics-function. I draw in a <code>UIView</code> a path and fill it with a color... now I want to make an animation that the path draws through the <code>UIView</code> from the left side to the right side.</p>
  
  <p>I read about CALayer, but I'm not sure how that works... some sample code or links would be great.</p>