使用按钮移动 pageViewController

Question

基本上我想移动我的 PageViewController 不仅用滑动而且用按钮。

@IBAction func nextButtonAction(_ sender: Any){

}

我的 PageViewController 在本指南中看起来像

我拥有的：

• 页面视图控制器
• 3 视图控制器

对不起，如果它是重复的，没有发现完全相同的情况

试图在每个 ViewController 上调用 UIPageViewControllerDataSource 但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 ViewController 的地方：

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

要通过单击按钮将页面 viewController 移动到您可以使用以下扩展程序非常简单地实现

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()
}

希望能帮到你