title: How to add a view on top of keyboard?
body: <p>I have added a view with buttons on top of keyboard using <code>setInputAccessoryView</code>. 
  Now i want functionality like when i click button from the view i want to display a <em>pickerView</em> on top of keyboard. Means like adding <em>pickerView</em> as subview of keyboard. </p>
  
  <p>How can i do this?</p>