title: TVOS - Keyboard color changes on backgrounding app when using UISearchController
body: <p>I am using Swift 5, testing on a 4K Apple TV.</p>
  <p>I am using the UISearchController without subclassing. I am trying to display a white search bar and keyboard on a dark background. So I set:</p>
  <p><code>self.searchController.searchBar.keyboardAppearance = .dark</code></p>
  <p>(I've tried this in viewDidLoad, viewWillAppear and viewDidAppear)</p>
  <p>This creates a search bar and keyboard that looks like:
  <a href="https://i.stack.imgur.com/rMlXH.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/rMlXH.jpg" alt="Image on first launch" /></a></p>
  <p>Then if I hit the menu button to leave my app and go back to the Apple TV home page and resume the app it changes the keyboard bar black:
  <a href="https://i.stack.imgur.com/nS8YZ.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/nS8YZ.jpg" alt="Image after Backgrounding App" /></a></p>
  <p>Any ideas what is going on here?</p>
  <p>(Note: When running this on the Simulator in Xcode the search bar stays white after backgrounding, I don't know why but it only seems to happen on actual Apple TVs)</p>