Question

我遵循了有关如何创建UIPageControl的教程，当我单击页面指示器时，它不会更改页面

func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
    guard let viewControllerIndex = orderedViewControllers.index(of: viewController) else {
        return nil
    }
    let previousIndex = viewControllerIndex - 1
    // User is on the first view controller and swiped left to loop to
    // the last view controller.
    guard previousIndex >= 0 else {
        return orderedViewControllers.last
        // Uncommment the line below, remove the line above if you don't want the page control to loop.
        // return nil
    }

    guard orderedViewControllers.count > previousIndex else {
        return nil
    }

    return orderedViewControllers[previousIndex]
}

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

    let nextIndex = viewControllerIndex + 1
    let orderedViewControllersCount = orderedViewControllers.count
    // User is on the last view controller and swiped right to loop to
    // the first view controller.
    guard orderedViewControllersCount != nextIndex else {
        return orderedViewControllers.first
        // Uncommment the line below, remove the line above if you don't want the page control to loop.
        // return nil
    }

    guard orderedViewControllersCount > nextIndex else {
        return nil
    }

    return orderedViewControllers[nextIndex]
}

func configurePageControl() {
    // The total number of pages that are available is based on how many available colors we have.
    pageControl = UIPageControl(frame: CGRect(x: 0,y: UIScreen.main.bounds.maxY - 40,width: UIScreen.main.bounds.width,height: 40))
    self.pageControl.numberOfPages = orderedViewControllers.count
    self.pageControl.currentPage = 0
    self.pageControl.tintColor = UIColor.gray
    self.pageControl.pageIndicatorTintColor = UIColor.gray
    self.pageControl.currentPageIndicatorTintColor = UIColor.white
    self.view.addSubview(pageControl)
}
func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) {
    let pageContentViewController = pageViewController.viewControllers![0]
    self.pageControl.currentPage = orderedViewControllers.index(of: pageContentViewController)!

}

Answer 1

在configurePageControl()中添加pageControl.addTarget

func configurePageControl() {
        // The total number of pages that are available is based on how many available colors we have.
         pageControl = UIPageControl(frame: CGRect(x: 0,y: UIScreen.main.bounds.maxY - 40,width: UIScreen.main.bounds.width,height: 40))

        //add target for dots
        pageControl.addTarget(self, action: #selector(self.pageControlSelectionAction(_:)), for: .touchUpInside)
        self.pageControl.numberOfPages = orderedViewControllers.count
        self.pageControl.currentPage = 0
        self.pageControl.tintColor = UIColor.gray
        self.pageControl.pageIndicatorTintColor = UIColor.gray
        self.pageControl.currentPageIndicatorTintColor = UIColor.white
        self.view.addSubview(pageControl)
    }

然后添加选择点时更改页面的方法。

 @objc func pageControlSelectionAction(_ sender: UIPageControl) {
        //move page to wanted page
        let page: Int? = sender.currentPage
        self.pageViewController?.setViewControllers([[orderedViewControllers[page!]]], direction: .forword, animated: true, completion: nil)
    }

如何在Page Control Swift上捕获点击事件

1 个答案: