使用按钮

Question

基本上我想移动我的PageViewController，不仅要使用滑动，还要使用按钮。

@IBAction func nextButtonAction(_ sender: Any){

}

My PageViewController looks like in this guide

我有什么：

• PageViewController
• 3 Viewcontrollers

很抱歉，如果它是重复的，则没有找到完全相同的情况

  

尝试在每个ViewController上调用UIPageViewControllerDataSource   但是也没有用，我认为这不是最好的方法

编辑： 这是我的PageViewController

class PageVC: UIPageViewController, UIPageViewControllerDataSource, UIPageViewControllerDelegate {

    lazy var VCarr: [UIViewController] = {

        return [self.VCInstance(name: "signUpVerification"),
        self.VCInstance(name: "signUpVerification1"),
        self.VCInstance(name: "signUpVerification2"),
        ]
    }()

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

    override func viewDidLoad() {
        super.viewDidLoad()
        self.dataSource = self
        self.delegate = self
        if let firsVC = VCarr.first {

            setViewControllers([firsVC], direction: .forward, animated: true, completion: nil)

        }
    }

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

    func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
        guard let viewControllerIndex = VCarr.index(of: viewController) else { return nil }
        let nextIndex = viewControllerIndex + 1
        guard nextIndex < VCarr.count else {
            return nil
        }
        return VCarr[nextIndex]
    }



}

extension PageVC {
    func goToNextPage(animated: Bool = true, completion: ((Bool) -> Void)? = nil) {
        if let currentViewController = VCarr.first {
            if let nextPage = dataSource?.pageViewController(self, viewControllerAfter: currentViewController) //for some reasons there's nil {
                setViewControllers([nextPage], direction: .forward, animated: animated, completion: completion)
            }
        }
    }
}

这是我称之为的Viewcontroller：

var pageVC = PageVC()
@IBAction func nextButtonAction(_ sender: Any){

   pageVC.goToNextPage()

}

解决方案：

YourViewController: {
 @IBAction func nextButtonAction(_ sender: Any){
        let pageViewController = self.parent as! PageVC
        pageViewController.nextPageWithIndex(index: 1)


    }
}

PageViewController: {
   func nextPageWithIndex(index: Int) {
        setViewControllers([VCarr[index]], direction: .forward, animated: true, completion: nil)
    }
}

Answer 1

尝试在按钮操作中添加此方法，以便从第一个View Controller移动到第二个：

self.pageViewController.setViewControllers([self.viewControllerAtIndex(1)!], direction: .forward, animated: true, completion: nil)
pageControl2.currentPage = 1

您可以使用PageControl添加当前的PageTracker。

self.pageViewController.setViewControllers([self.viewControllerAtIndex(pageControl.currentPage + 1)!], direction: .forward, animated: true, completion: nil)
pageControl.currentPage += 1

Answer 2

要通过按钮点击移动页面viewController，您可以通过使用以下扩展

来实现

extension UIPageViewController {
    func goToNextPage(animated: Bool = true, completion: ((Bool) -> Void)? = nil) {
        if let currentViewController = viewControllers?[0] {
            if let nextPage = dataSource?.pageViewController(self, viewControllerAfter: currentViewController) {
                setViewControllers([nextPage], direction: .forward, animated: animated, completion: completion)
            }
        }
    }

    func goToPreviousPage(animated: Bool = true, completion: ((Bool) -> Void)? = nil) {
        if let currentViewController = viewControllers?[0] {
            if let previousPage = dataSource?.pageViewController(self, viewControllerBefore: currentViewController){
                setViewControllers([previousPage], direction: .reverse, animated: true, completion: completion)
            }
        }
    }
}

前进

self.pageViewController.goToNextPage()

向后移动

self.pageViewController.goToPreviousPage()

不要忘记检查索引是否可用

例如：

if pageArray.count > currentIdex {
self.pageViewController.goToNextPage()
}

希望这会对你有所帮助