ios - 使用 PageController 快速移动到下一个 ViewMontroller

Question

我有一个页面 View Controller ，在其中显示一些项目，在主视图 Controller 中，我希望能够使用按钮移至下一页。我已将 View Controller 添加到数组中，但如何创建一个在下一个和后退按钮中调用的函数让我感到困惑。

下面是我的代码

private var pageController: UIPageViewController!

    lazy var controllers: [UIViewController] = {
        let locVC = LocationVC()
        locVC.delegate = self
        let typeVC = TypeVC()
        typeVC.delegate = self
        return [locVC,
                typeVC]
    }() 

private func setupPageController() {

    self.pageController = UIPageViewController(transitionStyle: .scroll, navigationOrientation: .horizontal, options: nil)
    self.pageController.dataSource = self
    self.pageController.delegate = self
    pageController.view.translatesAutoresizingMaskIntoConstraints = false

    addChild(pageController)
    view.addSubview(pageController.view)
    NSLayoutConstraint.activate([
        pageController.view.topAnchor.constraint(equalTo: navView.bottomAnchor),
        pageController.view.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor),
        pageController.view.leadingAnchor.constraint(equalTo: view.leadingAnchor),
        pageController.view.trailingAnchor.constraint(equalTo: view.trailingAnchor)
        ])
    pageController?.setViewControllers([controllers[0]], direction: .forward, animated: false)

}

func viewControllerAtIndex(index: Int) -> UIViewController? {
        if controllers.count == 0 || index >= controllers.count {
            return nil
        }

        return UIViewController()
    }

    func backBtnClicked() {

        guard currentIndex - 1 >= 0 else { return }
        currentIndex -= 1
        guard let startingViewController = viewControllerAtIndex(index: currentIndex) else { return }
        pageController.setViewControllers([startingViewController], direction: .reverse, animated: false)
    }

所有 View Controller 都有一个变量，即 var pageIndex: Int = 0 我相信这将用于检测当前页面

Answer 1

您需要(例如，转到寻呼机中的第一个 vc)

pageController.setViewControllers([controllers[index]], direction: .forward, animated: true, completion: nil)