如何使用按钮在 UIPageViewController 中向前和向后导航？

Question

我正在为物理治疗诊所的新患者创建一个入职应用程序。新患者将在 UIPageViewController 内的每个视图控制器上回答问题，然后点击按钮转到下一个问题。

我按照教程设置了 UIPageViewController PageVC 以及 3 个视图控制器。 PageVC 目前通过滑动来更改页面，但我希望能够使用两个作为 PageVC 本身子视图的按钮通过视图控制器来回导航。我该如何实现？

我喜欢使用 UIPageViewController 并且想更深入地了解它。如果除了使用 UIPageViewController 之外还有更有效的方法来完成同样的任务，我很乐意考虑。

    class PageVC: UIPageViewController, UIPageViewControllerDataSource {

        private(set) lazy var orderedViewControllers: [UIViewController] = {
            return [self.VCInstance(name: "BodyChart"),
                    self.VCInstance(name: "Symptoms"),
                    self.VCInstance(name: "HadSurgery")]
        }()

        private func VCInstance(name: String) -> UIViewController {
            return UIStoryboard(name: "Main", bundle: nil) .
                instantiateViewController(withIdentifier: name)
        }

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

            let previousIndex = viewControllerIndex - 1

            guard previousIndex >= 0 else {
                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

            guard orderedViewControllersCount != nextIndex else {
                return nil
            }

            guard orderedViewControllersCount > nextIndex else {
                return nil
            }

            return orderedViewControllers[nextIndex]
        }

        override func viewDidLoad() {
            super.viewDidLoad()

            dataSource = self

            if let firstViewController = orderedViewControllers.first {
                setViewControllers([firstViewController], direction: .forward, animated: true, completion: nil)
            }
        }

 }

Answer 1

我想你要找的是但这是另一种方式。

UIPageViewController 有一个实例方法转换。下面的代码片段将从第一页移动到第二页子视图控制器。

pageViewController.transition(from: pageViewController.viewControllers[0], to: pageViewController.viewControllers[1], duration: 0.3, options: UIViewAnimationOptions.curveEaseInOut, animations: nil, completion: nil)

PageVC currently changes pages by swiping, but I want to be able to navigate backward and forward through view controllers using two buttons

将您的按钮添加到页面内容，然后禁用或以礼貌的方式禁用视图的用户交互。

如何使用按钮在 UIPageViewController 中向前和向后导航？

How do I navigate forward and backward within UIPageViewController using buttons?

ios

swift

uipageviewcontroller