let storyboard = UIStoryboard(name: "Main", bundle: nil)
    self.pageViewController = storyboard.instantiateViewController(withIdentifier: "articlePageViewController") as! UIPageViewController
    self.pageViewController.dataSource = self
    let initialContenViewController = self.pageTutorialAtIndex(0) as ArticleImageViewController
    self.pageViewController.setViewControllers([initialContenViewController], direction: UIPageViewControllerNavigationDirection.forward, animated: true, completion: nil)



    self.pageViewController.view.frame = CGRect(x: 0, y: 0, width: Int(self.view.frame.width), height: Int(self.view.frame.height))
    self.pageViewController.view.center = self.mainView.center
    self.pageViewController.view.tag = 100
    self.addChildViewController(self.pageViewController)
    self.view.addSubview(self.pageViewController.view)
    self.pageViewController.didMove(toParentViewController: self)

self.willMove(toParentViewController: nil)
self.view.removeFromSuperview()
self.removeFromParentViewController()