UIPageViewController Minimum Setup Template

The minimum setup to get started using the UIPageViewController.

 
class ViewController: UIPageViewController, UIPageViewControllerDataSource {

    var pages: [UIViewController] = [UIViewController]()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        dataSource = self
        
        pages.append(UIStoryboard(name: "Main", bundle: nil)
            .instantiateViewController(withIdentifier: "Page1"))
        pages.append(UIStoryboard(name: "Main", bundle: nil)
            .instantiateViewController(withIdentifier: "Page2"))
        pages.append(UIStoryboard(name: "Main", bundle: nil)
            .instantiateViewController(withIdentifier: "Page3"))
        
        setViewControllers([pages.first!], direction: .forward, animated: true, 
            completion: nil)
    }

    func pageViewController(_ pageViewController: UIPageViewController, 
        viewControllerBefore viewController: UIViewController) -> UIViewController? {
        
        let index = pages.index(of: viewController)!
        
        if index == 0 {
            return nil
        }
        
        return pages[index - 1]
    }
    
    func pageViewController(_ pageViewController: UIPageViewController, 
        viewControllerAfter viewController: UIViewController) -> UIViewController? {
        
        let index = pages.index(of: viewController)!
        
        if index == pages.count - 1 {
            return nil
        }
        
        return pages[index + 1]
    }
    
    func presentationCount(for pageViewController: UIPageViewController) -> Int {
        return pages.count
    }
    
    func presentationIndex(for pageViewController: UIPageViewController) -> Int {
        return 0
    }
}
 

(Xcode 8, Swift 3.0)