title: Setting the alpha of a layer border?
body: <p>I am setting a border to my <code>layer</code> by adding the following line of code:</p>
  
  <p><code>[self.avatar.layer setBorderColor:[UIColor whiteColor].CGColor];</code></p>
  
  <p>How can I change the alpha on just the border and not the <code>avatar</code> object as well?</p>