title: Build app on Xcode 9 targeting iOS 11 but have compatibility mode on iPhone X
body: <p>Does anyone know how to build app targeting iOS 11 on Xcode 9 but still have it run in compatibility mode on iPhone X such that it still shows the top and bottom bar borders rather then scale app to fill the screen?</p>
  
  <p>In case this confuses people on the new iPhone X when an old iOS 10 or lower app is run it will run in "Compatibility Mode" which will show a black bar on top and bottom of screen much the way an iPhone app looks on an iPad.</p>