Question

我正在使用一个容器来实现入职流程。这样做，我希望用户仅在显示流程的最后一页时才能使用“下一步”按钮。

当前，按钮将在最后一页即将显示的同时显示（即使仅检测到手势，但页面仍保留在同一页面上，也会显示按钮。我的意思是我有3页如果我愿意交换，如果我停留在第二页上，则显示按钮）。

这是我的课程：

class OnboardingViewController: UIPageViewController, UIPageViewControllerDataSource, UIPageViewControllerDelegate {

    enum PageViews: String {
        case firstPV
        case secondPV
        case thirdPV
    }

    var skipBtn: UIButton!
    var nextIndex: Int!

    fileprivate lazy var orderedViewController: [UIViewController] = {
        return [self.getViewController(withIdentifier: PageViews.firstPV.rawValue),
                self.getViewController(withIdentifier: PageViews.secondPV.rawValue),
                self.getViewController(withIdentifier: PageViews.thirdPV.rawValue)]
    }()

    fileprivate func getViewController(withIdentifier identifier: String) -> UIViewController
    {
        return (storyboard?.instantiateViewController(withIdentifier: identifier))!
    }

    func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
        guard let viewControllerIndex = orderedViewController.index(of: viewController) else { return nil }
        let previousIndex = viewControllerIndex - 1
        enableSkipBtn(enabling: false)
        guard previousIndex >= 0 else { return nil }
        guard orderedViewController.count > previousIndex else { return nil }
        return orderedViewController[previousIndex]
    }

    func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
        guard let viewControllerIndex = orderedViewController.index(of: viewController) else { return nil }
        nextIndex = viewControllerIndex + 1
        guard nextIndex < orderedViewController.count else { return nil }
        guard orderedViewController.count > nextIndex else { return nil }
        if nextIndex == orderedViewController.count - 1 {
            enableSkipBtn(enabling: true)
        }

        return orderedViewController[nextIndex]
    }

    func presentationCount(for: UIPageViewController) -> Int {
        return orderedViewController.count
    }

    func presentationIndex(for pageViewController: UIPageViewController) -> Int {
        return 0
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        self.dataSource = self
        self.delegate = self

        if let firstVC = orderedViewController.first {
            setViewControllers([firstVC], direction: .forward, animated: true, completion: nil)
            nextIndex = 0
        }
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

    //MARK: Private Methods
    func enableSkipBtn(enabling: Bool) {
        skipBtn.isEnabled = enabling
        skipBtn.isHidden = !enabling
    }

}

我正在使用viewControllerAfter函数隐藏或显示我的按钮，但是它没有做我想做的事情。

如果您需要更多详细信息，请问。

谢谢。

Answer 1

实施此委托方法：

unique_ptr

快速显示入职流程结束时的显示按钮

1 个答案: