Question

我要创建脊椎中间位置的UIPageViewController。我阅读了UIPageViewController的一些教程，但是在本教程中，使用的是最低或最高位置。而且我无法使用脊椎中间位置创建UIPageViewController。

我具有此功能，以创建脊椎中间位置为最小或最大位置的UIPageViewController：

func createPageViewController() {

            // Instantiate the PageViewController
            let pageController = self.storyboard?.instantiateViewController(withIdentifier: "PageViewController") as! UIPageViewController
            pageController.dataSource = self
            pageController.delegate = self

            if images.count > 0{
                let contentController = getContentViewController(withIndex: 0)!
                let contentControllers = [contentController]

                pageController.setViewControllers(contentControllers, direction: UIPageViewControllerNavigationDirection.forward, animated: true, completion: nil)

            }

            pageViewController = pageController

            self.addChildViewController(pageViewController!)

            self.view.addSubview(pageViewController!.view)
            pageViewController!.didMove(toParentViewController: self)

        }

我试图为此进行更改：

let contentController = getContentViewController(withIndex: 0)!
let contentController1 = getContentViewController(withIndex: 1)!
let contentControllers = [contentController, contentController1]

但是在这种情况下，我的图像没有显示在页面中。这没有帮助。我究竟做错了什么？如何使用书脊中间位置创建UIPageViewController？

更新

import UIKit

class PageViewController: UIViewController {

    @IBOutlet weak var PageControl: UIPageControl!

    var pageViewController: UIPageViewController?
    var images = ["book1page1.png","book1","book1","book1page2.png","book1page1.png","book1page2.png"]
    var pendingIndex: Int?

    override func viewDidLoad() {
        super.viewDidLoad()

        createPageViewController()
        setupPageControll()

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func createPageViewController() {
        // Instantiate the PageViewController
        let pageController = self.storyboard?.instantiateViewController(withIdentifier: "PageViewController") as! UIPageViewController
        pageController.dataSource = self
        pageController.delegate = self

        if images.count > 0{
            let firstController = getContentViewController(withIndex: 0)!
            let contentControllers = [firstController]

            pageController.setViewControllers(contentControllers, direction: UIPageViewControllerNavigationDirection.forward, animated: true, completion: nil)

        }

        pageViewController = pageController

        self.addChildViewController(pageViewController!)

        //self.view.addSubview(pageViewController!.view)
        self.view.insertSubview(pageViewController!.view, at: 0)
        pageViewController!.didMove(toParentViewController: self)

    }

    //Setup Pagination Icons and count
    func presentationCount(for pageViewController: UIPageViewController) -> Int {
        return images.count
    }

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

    func setupPageControll(){
        let apperance = UIPageControl.appearance()
        apperance.pageIndicatorTintColor = UIColor.gray
        apperance.currentPageIndicatorTintColor = UIColor.white
        apperance.backgroundColor = UIColor.clear
    }

    func currentControllerIndex() -> Int{
        let pageItemController = self.currentConroller()

        if let controller = pageItemController as? ContentViewController {
            return controller.itemIndex
        }
        return -1
    }

    ///////////////////////////////////////////////

    func currentConroller() -> UIViewController?{
        if (self.pageViewController?.viewControllers?.count)! > 0{
            return self.pageViewController?.viewControllers![0]
        }

        return nil
    }

    func getContentViewController(withIndex index: Int) -> ContentViewController? {
        if index < images.count{
            let contentVC = self.storyboard?.instantiateViewController(withIdentifier: "ContentViewController") as! ContentViewController
            contentVC.itemIndex = index
            contentVC.imageName = images[index]

            return contentVC
        }

        return nil
    }

}

extension PageViewController: UIPageViewControllerDataSource, UIPageViewControllerDelegate {

    func pageViewController(_ pageViewController: UIPageViewController, willTransitionTo pendingViewControllers: [UIViewController]) {
        pendingIndex = (pendingViewControllers.first as! ContentViewController).itemIndex
    }

    func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) {
        if completed {
            let currentIndex = pendingIndex
            if let index = currentIndex {
                self.PageControl.currentPage = index
            }

        }
    }

    func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
        let contentVC = viewController as! ContentViewController
        if contentVC.itemIndex > 0 {
            return getContentViewController(withIndex: contentVC.itemIndex - 1)
        }

        return nil
    }

    func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
        let contentVC = viewController as! ContentViewController
        if contentVC.itemIndex + 1 < images.count {
            return getContentViewController(withIndex: contentVC.itemIndex + 1)
        }

        return nil
    }
}

Answer 1

在故事板上选择您的PageViewController并进行设置。脊椎位置none至Mid。还要选中double sided。

如下修改您的代码。（更改由您自己的代码完成）

import UIKit

class PageViewController: UIViewController {

    @IBOutlet weak var PageControl: UIPageControl!

    var pageViewController: UIPageViewController?
    var images = ["01","02","03","04"]
    var pendingIndex: Int?

    override func viewDidLoad() {
        super.viewDidLoad()
        createPageViewController()
        setupPageControll()

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func createPageViewController() {
        let pageController = self.storyboard?.instantiateViewController(withIdentifier: "PageViewController") as! UIPageViewController

        pageController.isDoubleSided = true
        pageController.dataSource = self
        pageController.delegate = self

        if images.count > 1{
            let firstController = getContentViewController(withIndex: 0)!
            let secondController = getContentViewController(withIndex: 1)!
            let contentControllers = [firstController,secondController]
            pageController.setViewControllers(contentControllers, direction: UIPageViewControllerNavigationDirection.forward, animated: true, completion: nil)

        }

        pageViewController = pageController
        self.addChildViewController(pageViewController!)
        self.view.insertSubview(pageViewController!.view, at: 0)
        pageViewController!.didMove(toParentViewController: self)

    }

    //Setup Pagination Icons and count
    func presentationCount(for pageViewController: UIPageViewController) -> Int {
        return images.count
    }

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

    func setupPageControll(){
        let apperance = UIPageControl.appearance()
        apperance.pageIndicatorTintColor = UIColor.gray
        apperance.currentPageIndicatorTintColor = UIColor.white
        apperance.backgroundColor = UIColor.clear
    }

    func currentControllerIndex() -> Int{
        let pageItemController = self.currentConroller()

        if let controller = pageItemController as? ContentView {
            return controller.itemIndex
        }
        return -1
    }

    ///////////////////////////////////////////////

    func currentConroller() -> UIViewController?{
        if (self.pageViewController?.viewControllers?.count)! > 0{
            return self.pageViewController?.viewControllers![0]
        }

        return nil
    }

    func getContentViewController(withIndex index: Int) -> ContentView? {
        if index < images.count{
            let contentVC = self.storyboard?.instantiateViewController(withIdentifier: "ContentViewController") as! ContentView
            contentVC.itemIndex = index
            //contentVC.imageName.image = self.images[index]

            return contentVC
        }

        return nil
    }

}

extension PageViewController: UIPageViewControllerDataSource, UIPageViewControllerDelegate {

    func pageViewController(_ pageViewController: UIPageViewController, willTransitionTo pendingViewControllers: [UIViewController]) {
        pendingIndex = (pendingViewControllers.first as! ContentView).itemIndex
    }

    func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {

        let contentVC = viewController as! ContentView

        if contentVC.itemIndex > 0 {
            return getContentViewController(withIndex: contentVC.itemIndex - 1)
        }

        return nil
    }

    func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
        let contentVC = viewController as! ContentView
        if contentVC.itemIndex + 1 < images.count {
            return getContentViewController(withIndex: contentVC.itemIndex + 1)
        }

        return nil
    }
}

Github Full Project。

迅捷：如何创建UIPageViewController？

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