如何在Swift中正确推进PageViewController

我正在尝试在Swift中开发一个教程。 我有一个页面视图控制器与指标（ http://www.appcoda.com/uipageviewcontroller-storyboard-tutorial/ ）工作，但我想添加一个button来转到下一个页面，通过点击它而不是刷屏（ TODO NextPage）。

我试过了：

let startVC = self.viewControllerAtIndex(self.index + 1) as TutorialContentViewController let viewControllers = NSArray(object: startVC) self.pageViewController.setViewControllers(viewControllers as! [UIViewController], direction: UIPageViewControllerNavigationDirection.Forward, animated: true, completion: nil) 

问题在于圆形页面指示符没有被更新，点击下一页后，所有页面都是第二页。

源代码

 import UIKit class TutorialViewController: UIViewController, UIPageViewControllerDataSource { var pageViewController: UIPageViewController! var pageTexts: NSArray! var pageImages: NSArray! var index: Int = 0 @IBOutlet var button: UIButton! override func viewDidLoad() { super.viewDidLoad() self.pageTexts = NSArray(objects: "Explore", "Today Widget") self.pageImages = NSArray(objects: "background1.jpg", "background2.jpg") self.pageViewController = self.storyboard?.instantiateViewControllerWithIdentifier("PageViewController") as! UIPageViewController self.pageViewController.dataSource = self let startVC = self.viewControllerAtIndex(index) as TutorialContentViewController let viewControllers = NSArray(object: startVC) self.pageViewController.setViewControllers(viewControllers as! [UIViewController], direction: .Forward, animated: true, completion: nil) self.pageViewController.view.frame = CGRectMake(0, 0, self.view.frame.width, self.view.frame.size.height - 60) self.addChildViewController(self.pageViewController) self.view.addSubview(self.pageViewController.view) self.pageViewController.didMoveToParentViewController(self) } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } func viewControllerAtIndex(index: Int) -> TutorialContentViewController { if (index >= self.pageTexts.count) { return TutorialContentViewController() } let vc: TutorialContentViewController = self.storyboard?.instantiateViewControllerWithIdentifier("TutorialContentViewController") as! TutorialContentViewController vc.image = self.pageImages[index] as! String vc.text = self.pageTexts[index] as! String vc.pageIndex = index self.index = index self.button.setTitle(self.index == self.pageTexts.count - 1 ? "Finish" : "Next", forState: .Normal) return vc } // MARK: - Page View Controller Data Source func pageViewController(pageViewController: UIPageViewController, viewControllerBeforeViewController viewController: UIViewController) -> UIViewController? { let vc = viewController as! TutorialContentViewController let index = vc.pageIndex as Int return self.viewControllerAtIndex(index) } func pageViewController(pageViewController: UIPageViewController, viewControllerAfterViewController viewController: UIViewController) -> UIViewController? { let vc = viewController as! TutorialContentViewController var index = vc.pageIndex as Int if (index == NSNotFound) { return nil } index++ if (index == self.pageTexts.count) { self.button.setTitle("Finish", forState: .Normal) return nil } else { self.button.setTitle("Next", forState: .Normal) } return self.viewControllerAtIndex(index) } func presentationCountForPageViewController(pageViewController: UIPageViewController) -> Int { return self.pageTexts.count } func presentationIndexForPageViewController(pageViewController: UIPageViewController) -> Int { return 0 } @IBAction func onButtonClick(sender: AnyObject) { if (self.index == self.pageTexts.count - 1) { let vc : UIViewController = self.storyboard!.instantiateViewControllerWithIdentifier("splashViewController") vc.modalTransitionStyle = UIModalTransitionStyle.CrossDissolve self.presentViewController(vc, animated: true, completion:nil) } else { //TODO NextPage } } 

}

Answer 1

这里let viewControllers = NSArray(object: startVC)你只用一个UIViewController （你的第二个UIViewController ）来创build一个UIViewController的数组。

而是使用代码中的viewControllerAtIndex函数。

所以，现在你的UIButton行动应该是这样的：

 func nextPage(sender: AnyObject) { self.pageViewController.setViewControllers([self.viewControllerAtIndex(self.index + 1)!], direction: .Forward, animated: true, completion: nil) }