title: Replace the default checkmark for UITableView with a custom image
body: <p>I'd like to replace the default checkmark image that is shown when a UITableViewCell's accessory is set to: UITableViewCellAccessoryCheckmark.</p>
  
  <p>So I'd still like to write:</p>
  
  <pre><code>[cell setAccessoryType:UITableViewCellAccessoryCheckmark];
  </code></pre>
  
  <p>But I'd like my own image to be shown rather than the default.</p>
  
  <p>Any help is much appreciated.</p>