如何在UIPageViewController SWIFT的最后一个视图上隐藏点

class MyPageViewController: UIPageViewController, UIPageViewControllerDataSource, UIPageViewControllerDelegate {
    
    var pageControl = UIPageControl()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        self.dataSource = self
        self.delegate = self
        
        // 设置页面控制器的样式
        pageControl.frame = CGRect(x: 0, y: UIScreen.main.bounds.height - 50, width: UIScreen.main.bounds.width, height: 50)
        pageControl.currentPageIndicatorTintColor = UIColor.red
        pageControl.pageIndicatorTintColor = UIColor.gray
        self.view.addSubview(pageControl)
        
        // 设置初始页面
        setViewControllers([viewControllerAtIndex(0)], direction: .forward, animated: true, completion: nil)
    }
    
    // 数据源方法：获取页面数量
    func presentationCount(for pageViewController: UIPageViewController) -> Int {
        return 5
    }
    
    // 数据源方法：获取指定索引的视图控制器
    func viewControllerAtIndex(_ index: Int) -> UIViewController {
        let viewController = UIViewController()
        viewController.view.backgroundColor = UIColor.random()
        return viewController
    }
    
    // 代理方法：滑动结束时调用
    func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) {
        if completed {
            let currentIndex = pageViewController.viewControllers!.first!.view.tag
            if currentIndex == presentationCount(for: pageViewController) - 1 {
                pageControl.isHidden = true
            } else {
                pageControl.isHidden = false
            }
        }
    }
}