Swift in Xcode pageViewController在刷卡时不更改页面

Question

我在Xcode的swift中有一个pageViewController。我按照教程制作了一个pageViewController，你可以在页面之间滑动和更改。我不这样做。这是我的pageViewController的代码。

class MainMenue: UIPageViewController {


private(set) lazy var orderedViewControllers: [UIViewController] = {
    return [self.newViewController(number: "1"), self.newViewController(number: "2")]
}()

private func newViewController(number:String)-> UIViewController{

    return UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "Menu\(number)")


}

override func viewDidLoad() {
    super.viewDidLoad()

    dataSource = self

    if let firstViewController = orderedViewControllers.first {
        setViewControllers([firstViewController], direction: .forward, animated: true, completion: nil)

    }
}


func pageViewController(pageViewController: UIPageViewController, viewControllerBeforeViewController viewController: UIViewController) -> UIViewController?{
    guard let viewControllerIndex = orderedViewControllers.index(of: viewController) else {
        return nil
    }

    let previousIndex = viewControllerIndex - 1

    guard previousIndex >= 0  else {
        return nil
    }

    return orderedViewControllers[previousIndex]
}

func pageViewController(pageViewController: UIPageViewController, viewControllerAfterViewController viewController: UIViewController) -> UIViewController? {
    guard let viewControllerIndex = orderedViewControllers.index(of: viewController) else {
        return nil
    }

    let nextIndex = viewControllerIndex + 1
    let orderedViewControllersCount = orderedViewControllers.count

    guard orderedViewControllersCount != nextIndex else {
        return nil
    }

    guard orderedViewControllersCount > nextIndex else{
        return nil
    }

    return orderedViewControllers[nextIndex]

}




override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
}


}

extension MainMenue: UIPageViewControllerDataSource{


public func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController?{
    return nil
}



public func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController?{

    return nil
}

}

我做的唯一不同于教程的是我只使用了2个视图控制器而不是3个。这是我遵循的教程。 https://spin.atomicobject.com/2015/12/23/swift-uipageviewcontroller-tutorial/