title: How to create a global reference for iAd and implement in multiple Viewcontrollers
body: <blockquote>
    <p>I'm having 5 ViewControllers in each of that i have to display iAd,so that i have to implement iAd code in each ViewControllers. Instead of that if i create set of common code in AppDelegate means i can just call that code wherever i need iAd to be displayed. </p>
  </blockquote>
  
  <p>If anyone has implemented this iAd concept means help me to get out of this issue. Thanks in Advance.</p>