Question

当用户首次使用该应用程序时，我将进行演练/入门过程。我正在使用页面视图控制器执行此操作。在最后一个屏幕上，我有一个按钮，只需将其拖动到选项卡栏视图控制器即可创建序列。但是我现在实际上需要一个IBaction来进行按钮点击。我已经尝试过CTRL拖动按钮到任何地方，但我得到的唯一选择是“退出”而不是操作。如何为此按钮创建IBaction？

这是页面视图控制器代码

import UIKit

class PageViewController: UIPageViewController, UIPageViewControllerDelegate, UIPageViewControllerDataSource {



    var pageControl = UIPageControl()

    // MARK: UIPageViewControllerDataSource

    lazy var orderedViewControllers: [UIViewController] = {
        return [self.newVc(viewController: "sbBlue"),
                self.newVc(viewController: "sbRed"),
                self.newVc(viewController: "sbGreen")]
    }()

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



        // This sets up the first view that will show up on our page control
        if let firstViewController = orderedViewControllers.first {
            setViewControllers([firstViewController],
                               direction: .forward,
                               animated: true,
                               completion: nil)
        }

        configurePageControl()

        // Do any additional setup after loading the view.
    }

    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 - 50,width: UIScreen.main.bounds.width,height: 50))
        self.pageControl.numberOfPages = orderedViewControllers.count
        self.pageControl.currentPage = 0
        self.pageControl.tintColor = UIColor.white
        self.pageControl.pageIndicatorTintColor = UIColor.lightGray
        self.pageControl.currentPageIndicatorTintColor = UIColor.white
        self.view.addSubview(pageControl)



    }

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


    // MARK: Delegate methords
    func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) {
        let pageContentViewController = pageViewController.viewControllers![0]
        self.pageControl.currentPage = orderedViewControllers.index(of: pageContentViewController)!
    }

    // MARK: Data source functions.
    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]


    }
}

Answer 1

确保情节提要中的页面视图控制器已连接到相应的控制器文件。

Answer 2

由于您只想在用户默认值中设置一个值，以表明该用户已“看到了第三个屏幕”，因此您可以：

在第三个VC的viewDidLoad()中设置值
在第3个VC中的`prepareForSegue中设置值
在tabViewController的第一个标签的VC的viewDidLoad()中设置值

从您的评论看来，您选择使用选项“ A”

如何从页面视图控制器创建按钮IBAction

2 个答案: