Swift - 带有 4 个 UIViewController 的 UIPageViewController

Posted 2023-02-27

【中文标题】Swift - 带有 4 个 UIViewController 的 UIPageViewController

【英文标题】：Swift - UIPageViewController with 4 UIViewControllers

【发布时间】：2015-03-23 14:53:17

【问题描述】：

我有一个带有 4 个视图控制器的应用程序，我需要在 UIPageViewController 中实现。我在情节提要中有 6 个场景：rootViewController、页面视图控制器和我需要在页面视图控制器中使用的其他视图控制器。

这是我的页面视图控制器类中的代码：

class ViewController: UIViewController, UIPageViewControllerDataSource 

    var contentPageRestorationIDs = [String]()
    var pageViewController = UIPageViewController()

    override func viewDidLoad() 
        super.viewDidLoad()

        contentPageRestorationIDs = ["Page1", "Page2", "Page3", "Page4"]
        // Do any additional setup after loading the view, typically from a nib.

        pageViewController = self.storyboard?.instantiateViewControllerWithIdentifier("PageViewController") as UIPageViewController
        pageViewController.dataSource = self

        var startingController: UIViewController = self.viewControllerAtIndex(0)!

        pageViewController.setViewControllers([startingController], direction: UIPageViewControllerNavigationDirection.Forward, animated: true, completion: nil)

        self.addChildViewController(self.pageViewController)
        self.view.addSubview(self.pageViewController.view)
        self.pageViewController.didMoveToParentViewController(self)


    

    func goToPreviousContentViewController()

            var currentViewController: AnyObject = self.pageViewController.viewControllers[0]
            var vcRestorationID = currentViewController.restorationIdentifier
            var index = find(contentPageRestorationIDs, vcRestorationID!!)

        var previousViewController: UIViewController = self.viewControllerAtIndex(index! - 1)!

        pageViewController.setViewControllers([previousViewController], direction: UIPageViewControllerNavigationDirection.Reverse, animated: false, completion: nil)



    

    func goToNextContentViewController()

        var currentViewController: AnyObject = self.pageViewController.viewControllers[0]
        var vcRestorationID = currentViewController.restorationIdentifier
        var index = find(contentPageRestorationIDs, vcRestorationID!!)

        var nextViewController: UIViewController = self.viewControllerAtIndex(index! - 1)!

        pageViewController.setViewControllers([nextViewController], direction: UIPageViewControllerNavigationDirection.Forward, animated: false, completion: nil)



    

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

    func pageViewController(pageViewController: UIPageViewController, viewControllerBeforeViewController viewController: UIViewController) -> (UIViewController?)
        var vcRestorationID = viewController.restorationIdentifier
        var index = find(contentPageRestorationIDs, vcRestorationID!)

        if(index == 0)
            return nil
        
        return viewControllerAtIndex(index! - 1)
    

    func pageViewController(pageViewController: UIPageViewController, viewControllerAfterViewController viewController: UIViewController) -> (UIViewController?)
        var vcRestorationID = viewController.restorationIdentifier
        var index = find(contentPageRestorationIDs, vcRestorationID!)

        if(index == contentPageRestorationIDs.count - 1)
            return nil
        
        return viewControllerAtIndex(index! + 1)


    


    func presentationCountForPageViewController(pageViewController: UIPageViewController) -> (Int)
        return self.contentPageRestorationIDs.count
    

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


    func viewControllerAtIndex(index: Int)-> BaseContentViewController! 

        if(index >= contentPageRestorationIDs.count)
            return nil
        

        var contentViewController:BaseContentViewController = storyboard?.instantiateViewControllerWithIdentifier(self.contentPageRestorationIDs[index])! as BaseContentViewController

        contentViewController.rootViewController = self

        return contentViewController

    

它在行中崩溃：

var contentViewController:BaseContentViewController = storyboard?.instantiateViewControllerWithIdentifier(self.contentPageRestorationIDs[index])! as BaseContentViewController

编辑：

【问题讨论】：

发布崩溃日志会有帮助...

我在崩溃日志中没有任何错误，我在 Xcode 上有此消息。 （我更新帖子）

【参考方案1】：

问题出在我没有从自定义类扩展的一个视图控制器中......对不起