title: prefersStatusBarHidden, preferredStatusBarStyle properties in Swift 3
body: <p>Starting Swift 3 / iOS 10, methods such as <strong>preferredStatusBarStyle</strong> and <strong>prefersStatusBarHidden</strong> became:</p>
  
  <pre><code>    @available(iOS 7.0, *)
      open var preferredStatusBarStyle: UIStatusBarStyle { get }
  
      @available(iOS 7.0, *)
      open var prefersStatusBarHidden: Bool { get }
  </code></pre>
  
  <p>As such existing code that used to override the methods no longer builds. Given these properties are readonly, how can you assign them a value / override them?</p>