iOS页面浏览 Controller

Question

我尝试设置 UIPageViewController组件，但我不能。我该如何修复它？

这是我的一段代码:

import UIKit

class ViewController: UIViewController, UIPageViewControllerDataSource {

    private var pageViewController: UIPageViewController?
    private let contenteImges = ["7272LOGO",
                                 "spBc",
                                 "tuto1"]

    override func viewDidLoad() {
        super.viewDidLoad()
        createPageViewController()
        setupPageControl()
        // Do any additional setup after loading the view, typically from a nib.
    }

    private func createPageViewController()
    {
        let PageController = self.storyboard!.instantiateViewControllerWithIdentifier("PageController") as! UIPageViewController
        pageController.dataSource = self

        if contenteImges.count > 0
        {
            let firstController = getItemController(0)!
            let startingViewControllers: NSArray = [firstController]
            PageController.setViewControllers(startingViewControllers as! [UIViewController], direction: UIPageViewControllerNavigationDirection.Forward, animated: false, completion: nil)
        }

        pageViewController = pageController
        addChildViewController(pageViewController!)
        self.view.addSubview(pageViewController!.view)
        pageViewController!.didMoveToParentViewController(self)
    }

    private func setupPageControl() {
        let appearance = UIPageControl.appearance()
        appearance.pageIndicatorTintColor = UIColor.grayColor()
        appearance.currentPageIndicatorTintColor = UIColor.whiteColor()
        appearance.backgroundColor = UIColor.darkGrayColor()
    }

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

        let itemController = viewController as PageItemController

        if itemController.itemIndex > 0 {
            return getItemController(itemController.itemIndex-1)
        }

        return nil
    }

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

        let itemController = viewController as PageItemController

        if itemController.itemIndex+1 < contentImages.count {
            return getItemController(itemController.itemIndex+1)
        }

        return nil
    }

    private func getItemController(itemIndex: Int) -> PageItemController?
    {

    }

    func presentationCountForPageViewController(pageViewController: UIPageViewController) -> Int {
        return contentImages.count
    }

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


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

它在七行上抛出错误:

1. pageController.dataSource = self

2. pageViewController = pageController

3. let itemController = viewController as PageItemController

4. let itemController = viewController as PageItemController

5. if itemController.itemIndex+1 < contentImages.count {

6. private func getItemController(itemIndex: Int) -> PageItemController?

7. return contentImages.count

在第 1、2、5 和 7 点中，它向我显示“使用未解析的标识符”。在第 3、4 和 6 点中，“使用未声明的类型”。

Answer 1

情况1:PageController.dataSource = self

情况2:pageViewController = PageController

情况3:没有声明PageItemController类

案例4:案例3

情况 5:由于情况 3，itemController 未实例化

情况 6:由于情况 3 而无法识别返回类型

情况7:返回contenteImges.count