UIPageViewController while using UIPageViewControllerTransitionStyleScroll doesn't stop at the second index

Question

I am working on an app which requires UIPageViewController using UIPageViewControllerTransitionStyleScroll. I had implemented using http://www.appcoda.com/uipageviewcontroller-tutorial-intro/ everything works fine, when i change the view,the content also changes according to the index of the UIPageViewController, but the only problem is that it doesn't change the navigation label title according to the index of the UIPageViewController. Means, for e.g i have total 3 pages, for the first page and the third page it shows the label title properly but as soon as i change the view to second , the content of the second view appears and the label title also appears correct for a few seconds only and after that it takes the label title of the third view. Similarly when i come back from third view to second view the label title takes the title of first view. I am not getting where i am doing mistake. Any suggestions??