title: How to start scrolling UIPickerView before it's visible?
body: <p>I want to start dragging and make it visible at the same time. 
  As of now, I have to click a button to make the pickerview visible and then scroll to select the desired row. How can I start the selection as soon as I start dragging from the button? </p>
  
  <p>I tried to illustrate both cases in this <a href="http://imgur.com/KqWZBxx" rel="nofollow">gif</a>. </p>