如何使用按钮在UIPageViewController中向前和向后导航?

时间:2017-12-22 19:51:47

标签: ios swift uipageviewcontroller

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和3个视图控制器。 PageVC目前通过滑动更改页面,但我希望能够使用两个按钮作为PageVC本身的子视图,在视图控制器中前后导航。我该如何做到这一点?

我喜欢使用UIPageViewController并希望了解它。如果除了使用UIPageViewController完成同样的任务之外还有一种更有效的方法,我很乐意考虑它。

    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)
            }
        }

 }

1 个答案:

答案 0 :(得分:1)

我认为您正在寻找的是here.但这是另一种方式。

UIPageViewController有一个实例方法转换。下面的代码段将从第一页子视图控制器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目前通过滑动来更改页面,但我希望能够使用两个按钮在视图控制器中前后导航

将您的按钮添加到网页内容,然后停用horizontal scrolling on PageVC's scrollview或停用视图'用户互动以有礼貌的方式。