UIPage ViewController，我想从非 uipage viewcontroller 导航另一个第二个 viewcontroller

Question

我需要 UIpageViewcontroller 的代码，它将像下面的图像 MVC 一样工作。

PageViewController Flow

编辑：

当我点击“Other ViewController”的下一个按钮时，它会调用 UIPageViewcontroller 的 ViewController 2。 具体流程如上图所示。

Answer 1

好的，这是一种方法

首先你需要在故事板中创建一个 UIPageViewController 并将类设置为与此代码相同

在一个新的 swift 文件中复制并粘贴它

class PageVC: UIPageViewController, UIPageViewControllerDataSource, UIPageViewControllerDelegate {
//make sure the storyboard PageviewControllers class is set to this class or it wont work

lazy var VCArray: [UIViewController] = {
    //here is where your viewController pages go. in storyboard create multiple viewControllers and give them a storyboard ID here is where the storyboard IDs will be put in
    return [self.VCInstance(name: "firstVC"),
            self.VCInstance(name: "secondVC"),
            self.VCInstance(name: "thirdVC")]
}()

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

override func viewDidLoad() {
    super.viewDidLoad()

    self.delegate = self
    self.dataSource = self

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


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

    for view in self.view.subviews {
        if view is UIScrollView {
            view.frame = UIScreen.main.bounds
        } else if view is UIPageControl {
            view.backgroundColor = UIColor.clear
        }
    }
}

public func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
    guard let viewControllerIndex = VCArray.index(of: viewController) else {
        return nil
    }

    let previousIndex = viewControllerIndex - 1

    guard previousIndex >= 0 else {
        return VCArray.last
    }

    guard VCArray.count > previousIndex else {
        return nil
    }
    return VCArray[previousIndex]
}

public func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
    guard let viewControllerIndex = VCArray.index(of: viewController) else {
        return nil
    }

    let nextIndex = viewControllerIndex + 1

    guard nextIndex < VCArray.count else {
        return VCArray.first
    }

    guard VCArray.count > nextIndex else {
        return nil
    }
    return VCArray[nextIndex]
}
//this is optional for the page counter at the bottom
public func presentationCount(for pageViewController: UIPageViewController) -> Int {
    return VCArray.count
}
//this is optional for the page counter at the bottom
public func presentationIndex(for pageViewController: UIPageViewController) -> Int {
    guard let firstViewController = viewControllers?.first, let firstViewControllerIndex = VCArray.index(of: firstViewController) else {
        return 0
    }
    return firstViewControllerIndex
}

}

解释-

上面的代码是非常可定制的，您可以更改底部是否有页面计数器或显示多少页面，通过使用它将多个故事板视图控制器转换为单页视图控制器，并且因为页面是单独的故事板viewControllers 你可以在页面上放任何你想要的东西......如果你仍然感到困惑，请查看YouTube上的这个视频