title: How to change the bottom edge color on the iPhone X programmatically?
body: <p>It changes on their native keyboard/emoji board, depending which of the two are open. I thought it would change the color automatically based on <code>UIInputViewController</code>, however it is not occurring with custom keyboard extensions:</p>
  
  <p><a href="https://i.stack.imgur.com/DhQek.png" rel="noreferrer"><img src="https://i.stack.imgur.com/DhQek.png" alt="enter image description here"></a></p>