title: What is the system font of iOS13?
body: <p>What is the iOS 13 system font?</p>
  
  <p>Before iOS 13 I used SFUIDisplay font.</p>
  
  <p><code>UIFont(name: ".SFUIDisplay-Light", size: UIFont.systemFontSize)</code></p>
  
  <p>But on iOS 13 it doesn't work. </p>