title: CALayer rotate by direction
body: <p>I'm trying to rotate a CALayer, first of all I rotate it by -30 degrees, so it turns left.</p>
  
  <pre><code>[UIView beginAnimations:nil context:NULL];
  [UIView setAnimationDuration:0.5];
  self.transform = CGAffineTransformMakeRotation(DEGREES_TO_RADIANS(-30));
  [UIView commitAnimations];
  </code></pre>
  
  <p>Now I want it to complete the rotate, do another rotation starting left, but it takes the shortest path.</p>
  
  <pre><code>[UIView beginAnimations:nil context:NULL];
  [UIView setAnimationDuration:0.5];
  self.transform = CGAffineTransformMakeRotation(DEGREES_TO_RADIANS(-30));
  [UIView commitAnimations];
  </code></pre>
  
  <p>How can I force it's rotation direction ?</p>