title: How to make navigation bar transparent in iOS 10
body: <p>I have the following code to make the navigation bar transparent but while still displaying the back button, this works on all versions of iOS but its stopped working with the iOS 10 beta</p>
  
  <pre><code>    navigationBar.setBackgroundImage(UIImage(), for: UIBarMetrics.default)
      navigationBar.shadowImage = UIImage()
      navigationBar.isTranslucent = true
  </code></pre>
  
  <p>Has something changed with iOS 10 in this area?</p>
  
  <p>Note its not possible to use navigationBar.isHidden as this would result in the navigation bar back button and title etc. disappearing also.</p>