UIPageViewController

UIPageViewController

class ViewController: UIPageViewController, UIPageViewControllerDataSource {

    private let imageNameList: [String] = ["ball.png", "neko.png"]
    
    private var index: Int = 0
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
        self.dataSource = self
        
        if let initialViewController = self.viewControllerAtIndex(0) {
            
            let viewControllers = [initialViewController]
            
            self.setViewControllers(viewControllers, direction: .Forward, animated: true, completion: nil)
        }
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    override func shouldAutorotate() -> Bool {
       
        return true
    }
    
    override func supportedInterfaceOrientations() -> Int {
        
        return Int(UIInterfaceOrientationMask.All.rawValue)
    }
    
    func pageViewController(pageViewController: UIPageViewController,
        viewControllerBeforeViewController viewController: UIViewController) -> UIViewController? {
        
        var i = (viewController as DetailViewController).index
        return self.viewControllerAtIndex(i - 1)
    }
    
    func pageViewController(pageViewController: UIPageViewController,
        viewControllerAfterViewController viewController: UIViewController) -> UIViewController? {
        
        var i = (viewController as DetailViewController).index
        return self.viewControllerAtIndex(i + 1)
    }
    
    func presentationCountForPageViewController(pageViewController: UIPageViewController) -> Int {
        
        return self.imageNameList.count
    }
    
    func presentationIndexForPageViewController(pageViewController: UIPageViewController) -> Int {
        
        return self.index
    }
    
    private func viewControllerAtIndex(index: Int) -> DetailViewController? {
    
        if index < 0 || index > self.imageNameList.count - 1 { return nil }
        
        let vc: DetailViewController =
            self.storyboard?.instantiateViewControllerWithIdentifier("detail") as DetailViewController
        self.index = index
        vc.index = index
        vc.imageName = self.imageNameList[index]
        
        return vc
    }
}

class DetailViewController: UIViewController {

    @IBOutlet weak var imageView: UIImageView!
    
    var index: Int = 0
    var imageName: String!
    
    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        self.imageView.image = UIImage(named: self.imageName)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}