title: How to change UITableViewCellAccessoryType.Checkmark's color?
body: <p>Here's my code:</p>
  
  <pre><code>cell.accessoryType = UITableViewCellAccessoryType.Checkmark
  </code></pre>
  
  <p>But when I run the app, I can't see the checkmark. </p>
  
  <p>Then I set background color to black, and I can see a white checkmark.</p>
  
  <p>How to change checkmark's color to other colors like blue?</p>