如何在UIPageviewController中实现水平滚动视图

let pageViewController = UIPageViewController(transitionStyle: .scroll, navigationOrientation: .horizontal, options: nil)
pageViewController.dataSource = self

extension YourViewController: UIPageViewControllerDataSource {
    func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
        // 返回前一页的视图控制器
    }
    
    func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
        // 返回后一页的视图控制器
    }
}

let viewControllers = [viewController1, viewController2, viewController3]

func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
    guard let index = viewControllers.firstIndex(of: viewController) else {
        return nil
    }
    if index > 0 {
        return viewControllers[index - 1]
    }
    return nil
}

func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
    guard let index = viewControllers.firstIndex(of: viewController) else {
        return nil
    }
    if index < viewControllers.count - 1 {
        return viewControllers[index + 1]
    }
    return nil
}

addChild(pageViewController)
view.addSubview(pageViewController.view)
pageViewController.view.frame = view.bounds
pageViewController.didMove(toParent: self)