title: Notification Center like view in iPad
body: <p>I want to show/hide a custom view on top of an iPad application like similar to how the Notification Center appears.</p>
  
  <p>Initially a small drop down arrow appear on top So when the user swipe down it from the top and it will reveal the whole view and finally when user swipe to top position it will hide that view.</p>
  
  <p>How to do this?</p>