title: Corner radius on UIVisualEffectView
body: <p>Hi Im wondering if It's possible to set a corner radius on a UIVisualEffectView?
  Here's the code that i've tried:</p>
  
  <pre><code>@IBOutlet var blurView: UIVisualEffectView!
  
  var blurLayer : CALayer{
      return blurView.layer
  }
  override func viewDidLoad() {
      super.viewDidLoad()
      setUpLayer()
      // Do any additional setup after loading the view.
  }
  
  func setUpLayer(){
      blurLayer.cornerRadius = 50
  }
  </code></pre>
  
  <p>and</p>
  
  <pre><code>@IBOutlet var blurView: UIVisualEffectView!
  
  override func viewDidLoad() {
      super.viewDidLoad()
      blurView.layer.cornerRadius = 50
      // Do any additional setup after loading the view.
  }
  </code></pre>
  
  <p>Non of them works.</p>