gistfile1.txt

class TutorialViewController: UIPageViewController, UIPageViewControllerDataSource, UIPageViewControllerDelegate {

    var images: [String]!

    override func viewDidLoad() {
        super.viewDidLoad()
        images = ["0","1","2"]
        self.delegate = self
        self.dataSource = self
        let startingViewController: PageContentViewController! = viewControllerAtIndex(0)
        let viewControllers: NSArray = [startingViewController]
        var currentIndex : Int = 0

        setViewControllers(viewControllers, direction: .Forward, animated: false, completion: nil)
        // Do any additional setup after loading the view.
    }
    func pageViewController(pageViewController: UIPageViewController, viewControllerBeforeViewController viewController: UIViewController) -> UIViewController?
    {
        var index = (viewController as PageContentViewController).pageIndex

        if (index == 0) || (index == NSNotFound) {
            return nil
        }

        index--

        return viewControllerAtIndex(index)
    }

    func pageViewController(pageViewController: UIPageViewController, viewControllerAfterViewController viewController: UIViewController) -> UIViewController?
    {
        var index = (viewController as PageContentViewController).pageIndex

        if index == NSNotFound {
            return nil
        }

        index++

        if (index == images.count) {
            return nil
        }

        return viewControllerAtIndex(index)
    }

    func viewControllerAtIndex(index: Int) -> PageContentViewController?
    {
        if images.count == 0 || index >= images.count
        {
            return nil
        }

        // Create a new view controller and pass suitable data.
        let pageContentViewController = storyboard?.instantiateViewControllerWithIdentifier("PageContentViewController") as PageContentViewController
        pageContentViewController.imageFile = images[index]
        pageContentViewController.pageIndex = index


        return pageContentViewController
    }

    func presentationCountForPageViewController(pageViewController: UIPageViewController) -> Int
    {
        return images.count
    }
    
    func presentationIndexForPageViewController(pageViewController: UIPageViewController) -> Int
    {
        return 0
    }
}

-----

class PageContentViewController: UIViewController {

    var imageFile: String!
    var pageIndex : Int = 0

    @IBOutlet weak var backgroundImageView: UIImageView!
    override func viewDidLoad() {
        super.viewDidLoad()
        backgroundImageView.image = UIImage(named: imageFile!)
        self.view.backgroundColor =  kColorLightGray
        // Do any additional setup after loading the view.
    }

}