title: UILabel Background Color Leaks to Border
body: <p>I'm creating a UILabel to which I set the background color and corner radius with the following code:</p>
  
  <pre><code>self.scoreLabel.backgroundColor = [UIColor DISRed];// custom red`
  self.scoreLabel.layer.masksToBounds = YES;
  self.scoreLabel.layer.cornerRadius = self.scoreLabel.frame.size.width/2;
  self.scoreLabel.layer.borderWidth = 8.0;
  self.scoreLabel.layer.borderColor = [[UIColor DISNavy] CGColor];
  </code></pre>
  
  <p>However the background's color seems to be leaking to the edge of the border (see image). Any ideas why? Any idea on how to fix it?</p>
  
  <p><img src="https://i.stack.imgur.com/33KrP.png" alt="enter image description here"></p>