title: CABasicAnimation keys
body: <p>I'm trying to know what are all the possible keys used in <code>CABasicAnimation</code></p>
  
  <p>like this one:</p>
  
  <pre><code>CABasicAnimation *imageRotation = [CABasicAnimation animationWithKeyPath:@"transform.rotation"];
  </code></pre>
  
  <p>which makes a rotation ... where can I find all possible keys?
  and thanks in forward</p>