Ios pageviewcontroller

Question

我尝试设置UIPageViewController组件，但我不能。我该如何解决？

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.
    }
}

它会在七行上抛出错误：

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，它显示了“使用未解析的标识符”。在第3,4和6点，“使用未申报的类型”。

Answer 1

案例1：PageController.dataSource = self

案例2：pageViewController = PageController

案例3：没有PageItemController类的声明

案例4：案例3

案例5：由于案例3

，itemController未实例化

案例6：由于案例3而无法识别的返回类型

案例7：return contenteImges.count