title: Set Shadow on Bottom UIView only
body: <p>I want to create bottom only shadow on UIView. Right now with this function, will create shadow in top, bottom, left, and right.</p>
  
  <pre><code>func setCardView(view : UIView){
      view.layer.masksToBounds = false
      view.layer.shadowOffset = CGSize(width: 0, height: 0)
      view.layer.shadowRadius = 2
      view.layer.shadowOpacity = 0.5
  }
  </code></pre>
  
  <p>Is there anyway to only create shadow in the bottom?
  Any help would be appreciated. Thank you!</p>