如何在iOS中自动滚动UIPage视图控制器？

import UIKit

class ViewController: UIViewController, UIPageViewControllerDataSource, UIPageViewControllerDelegate {
    
    var pageViewController: UIPageViewController!
    var timer: Timer?
    var currentPage = 0
    let totalPages = 3 // 总页数
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建UIPageViewController实例
        pageViewController = UIPageViewController(transitionStyle: .scroll, navigationOrientation: .horizontal, options: nil)
        pageViewController.dataSource = self
        pageViewController.delegate = self
        
        // 设置初始页
        let initialViewController = viewControllerAtIndex(currentPage)
        pageViewController.setViewControllers([initialViewController], direction: .forward, animated: true, completion: nil)
        
        // 将UIPageViewController添加到当前视图控制器
        addChild(pageViewController)
        view.addSubview(pageViewController.view)
        pageViewController.didMove(toParent: self)
        
        // 启动定时器
        startTimer()
    }
    
    // 定时器触发方法
    @objc func scrollToNextPage() {
        currentPage += 1
        if currentPage >= totalPages {
            currentPage = 0
        }
        
        let nextViewController = viewControllerAtIndex(currentPage)
        pageViewController.setViewControllers([nextViewController], direction: .forward, animated: true, completion: nil)
    }
    
    // 开始定时器
    func startTimer() {
        timer = Timer.scheduledTimer(timeInterval: 5, target: self, selector: #selector(scrollToNextPage), userInfo: nil, repeats: true)
    }
    
    // 停止定时器
    func stopTimer() {
        timer?.invalidate()
        timer = nil
    }
    
    // 根据索引获取对应的视图控制器
    func viewControllerAtIndex(_ index: Int) -> UIViewController {
        let contentViewController = UIViewController() // 替换为自己的视图控制器
        // 设置视图控制器的内容
        
        return contentViewController
    }
    
    // MARK: - UIPageViewControllerDataSource
    
    func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
        var index = currentPage - 1
        if index < 0 {
            index = totalPages - 1
        }
        return viewControllerAtIndex(index)
    }
    
    func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
        var index = currentPage + 1
        if index >= totalPages {
            index = 0
        }
        return viewControllerAtIndex(index)
    }
    
    // MARK: - UIPageViewControllerDelegate
    
    func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) {
        if completed {
            // 更新当前页码
            if let currentViewController = pageViewController.viewControllers?.first {
                currentPage = indexOfViewController(currentViewController)
            }
        }
    }
    
    // 获取视图控制器的索引
    func indexOfViewController(_ viewController: UIViewController) -> Int {
        // 根据自己的实际情况实现
        return 0
    }
}