title: How to prevent shadows in popups iOS 13
body: <p>I have quite a number of popover classes that rely on</p>
  <pre><code>+ (BOOL)wantsDefaultContentAppearance{
      return NO;
  }
  </code></pre>
  <p>to stop the shadow from being shown. Now I see that this is deprecated in ios 13. So what is the replacement? I tried reading the documentation from apple but couldn't find anything.</p>