_UIPageViewControllerでウォークスルーダミー

_UIPageViewControllerでウォークスルーダミー.md

ウォークスルー

MyUIPageViewController.swift

import UIKit
import PlaygroundSupport

class MyViewController : UIPageViewController, UIPageViewControllerDataSource{
    let first: UIViewController = FirstViewController()
    let second: UIViewController = SecondViewController()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        self.view.backgroundColor = .white
        self.setViewControllers([first], direction: .forward, animated: true, completion: nil)
        self.dataSource = self
        
        UIPageControl.appearance().pageIndicatorTintColor = .lightGray
        UIPageControl.appearance().currentPageIndicatorTintColor = .purple
    }
    
    func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
        if viewController is SecondViewController {
            return first
        } else {
            return nil
        }
    }

    func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
        if viewController is FirstViewController {
            return second
        } else {
            return nil
        }
    }
    
    func presentationCount(for pageViewController: UIPageViewController) -> Int {
        return 2
    }

    func presentationIndex(for pageViewController: UIPageViewController) -> Int {
        return 0
    }
}

class FirstViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        self.view.backgroundColor = .blue
    }
}

class SecondViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        self.view.backgroundColor = .green
    }
}

// Present the view controller in the Live View window
PlaygroundPage.current.liveView = MyViewController(transitionStyle: .scroll, navigationOrientation: .horizontal, options: nil)