ios – Swift：UIPageViewController – 加载单独的视图

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我正在关注本教程： http://swiftiostutorials.com/ios-tutorial-using-uipageviewcontroller-create-content-slider-objective-cswift/创建一个显示多个滑块的应用程序.

即使我有这个教程要工作,这个例子只是改变一个基于存储在数组中的图像.

我如何得到它加载ViewControllers而不是图像

我有4个ViewController：

> ViewController1
> ViewController2
> ViewController3
> ViewController4

我想幻灯片一个显示ViewController1和slide2加载ViewController2等….

这是我的主要ViewController：

import UIKit

class ViewController: UIViewController,UIPageViewControllerDataSource {

// MARK: - Variables
private var pageViewController: UIPageViewController?

// Initialize it right away here
private let contentImages = ["nature_pic_1.png","nature_pic_2.png","nature_pic_3.png","nature_pic_4.png"];

// MARK: - View Lifecycle
override func viewDidLoad() {
    super.viewDidLoad()
    createPageViewController()
    setupPageControl()
}

private func createPageViewController() {

    let pageController = self.storyboard!.instantiateViewControllerWithIdentifier("PageController") as UIPageViewController
    pageController.dataSource = self

    if contentImages.count > 0 {
        let firstController = getItemController(0)!
        let startingViewControllers: NSArray = [firstController]
        pageController.setViewControllers(startingViewControllers,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()
}

// MARK: - UIPageViewControllerDataSource

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? {

    if itemIndex < contentImages.count {
        let pageItemController = self.storyboard!.instantiateViewControllerWithIdentifier("ItemController") as PageItemController
        pageItemController.itemIndex = itemIndex
        pageItemController.imageName = contentImages[itemIndex]
        return pageItemController
    }

    return nil
}

// MARK: - Page Indicator

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

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

这里是我的PageItemController：

import UIKit

class PageItemController: UIViewController {

// MARK: - Variables
var itemIndex: Int = 0
var imageName: String = "" {

    didSet {

        if let imageView = contentImageView {
            imageView.image = UIImage(named: imageName)
        }

    }
}

@IBOutlet var contentImageView: UIImageView?

// MARK: - View Lifecycle
override func viewDidLoad() {
    super.viewDidLoad()
    contentImageView!.image = UIImage(named: imageName)
}
}

我刚刚进入Swift / iOS开发,真正试图通过开发进入它.谢谢你的答案:)

编辑：让问题清楚

如何使它有一个与UIPageViewController左/右对应的视图控制器数组？

所以当我在ViewController1上向左滑动时,UIViewController2被加载并反向扫描右边.

解决方法

假设您有与UIPageViewController相同的故事板中定义的视图控制器1-4,并且将其Storyboard ID设置为ViewController0,ViewController1等等,然后创建一个方法来填充视图控制器数组,并在viewDidLoad中调用)之前调用createPageViewController() 
override func viewDidLoad() {
        super.viewDidLoad()
        populateControllersArray()
        createPageViewController()
        setupPageControl()
    }

实现方法如下：

var controllers = [PageItemController]()

    func populateControllersArray() {
        for i in 0...3 {
            let controller = storyboard!.instantiateViewControllerWithIdentifier("ViewController\(i)") as PageItemController
            controller.itemIndex = i
            controllers.append(controller)
        }
    }

并将您的createPageViewController()定义如下

private func createPageViewController() {

        let pageController = self.storyboard!.instantiateViewControllerWithIdentifier("PageController") as UIPageViewController
        pageController.dataSource = self

        if !controllers.isEmpty {
            pageController.setViewControllers([controllers[0]],completion: nil)
        }

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

那么在你的两个代表之前和之后的方法：

func pageViewController(pageViewController: UIPageViewController,viewControllerBeforeViewController viewController: UIViewController) -> UIViewController? {
        if let controller = viewController as? PageItemController {
            if controller.itemIndex > 0 {
                return controllers[controller.itemIndex - 1]
            }
        }
        return nil
    }
    func pageViewController(pageViewController: UIPageViewController,viewControllerAfterViewController viewController: UIViewController) -> UIViewController? {
        if let controller = viewController as? PageItemController {
            if controller.itemIndex < controllers.count - 1 {
                return controllers[controller.itemIndex + 1]
            }
        }
        return nil
    }

并在计数方式

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

事实上,您可以使用要显示的任何视图控制器填充控制器,只需将其类作为PageItemController设置在storyboard中(以便具有索引属性).

或者您可以将每个视图控制器设置为自己的类,并使用运行时属性获取和设置.

使用controller.valueForKey(“itemIndex”)作为Int在前后方法而不是controller.itemIndex

使用controller.setValue(i,forKey：“itemIndex”),而不是controller.itemIndex =我在populateControllersArray()中.

只需确保每个控制器类具有Int属性itemIndex,或者您的应用程序将崩溃.

要在代码中携带所有内容,请执行以下操作：

import UIKit

import UIKit

class ViewController: UIViewController,UIPageViewControllerDataSource {

    // MARK: - Variables
    private var pageViewController: UIPageViewController?

    // MARK: - View Lifecycle
    override func viewDidLoad() {
        super.viewDidLoad()
        populateControllersArray()
        createPageViewController()
        setupPageControl()
    }

    var controllers = [PageItemController]()


    func populateControllersArray() {
        for i in 0...3 {
            let controller = storyboard!.instantiateViewControllerWithIdentifier("ViewController\(i)") as PageItemController
            controller.itemIndex = i
            controllers.append(controller)
        }
    }

    private func createPageViewController() {

        let pageController = self.storyboard!.instantiateViewControllerWithIdentifier("PageController") as UIPageViewController
        pageController.dataSource = self

        if !controllers.isEmpty {
            pageController.setViewControllers([controllers[0]],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()
    }

    // MARK: - UIPageViewControllerDataSource
    func pageViewController(pageViewController: UIPageViewController,viewControllerAfterViewController viewController: UIViewController) -> UIViewController? {
        if let controller = viewController as? PageItemController {
            if controller.itemIndex < controllers.count - 1 {
                return controllers[controller.itemIndex + 1]
            }
        }
        return nil
    }

    // MARK: - Page Indicator

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

    func presentationIndexForPageViewController(pageViewController: UIPageViewController) -> Int {
        return 0
}
原文链接：https://www.f2er.com/iOS/337523.html

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