title: How to add animation while changing the hidden mode of a uiview?
body: <p>I want to add animation to a view while changing its hidden mode i.e</p>
  
  <pre><code>my_view.hidden=YES;
  </code></pre>
  
  <p>I have added a button in navigationbar. When we click on it the new view is set to be unhide. It draws at the upper of the navigation table. </p>