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
}
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