ios - UIPageViewController 从子 UIViewController 上的控件过渡

Question

我有一个 PageViewController，它有两个 UIViewController，它们的设置如下:

ViewController.swift

override func viewDidLoad() {
    super.viewDidLoad()

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

    let startingViewController = self.viewControllerAtIndex(self.index)
    let viewControllers: NSArray = [startingViewController]
    self.pageViewController.setViewControllers(viewControllers as [AnyObject], direction: UIPageViewControllerNavigationDirection.Forward, animated: false, completion: nil)

    self.pageViewController.view.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height-10)
    self.addChildViewController(self.pageViewController)
    self.view.addSubview(self.pageViewController.view)
    self.pageViewController.didMoveToParentViewController(self)

}

在其中一个 subview Controller 中，我有一个按钮应该转换到 PageViewController 中的特定索引:

    @IBAction func createClick(sender: UIButton, forEvent event: UIEvent) {

    let pageViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewControllerWithIdentifier("PageViewController") as! UIPageViewController

    let secondViewController = self.storyboard?.instantiateViewControllerWithIdentifier("NextViewController") as! UIViewController
    let viewControllers: NSArray = [secondViewController]
    pageViewController.self.setViewControllers(viewControllers as [AnyObject], direction: UIPageViewControllerNavigationDirection.Forward, animated: true, completion: nil)

}

没有错误，但页面没有转换。我认为委托(delegate)有问题，但我不确定如何解决。

Answer 1

问题是您实际上并没有在您的应用程序实际使用的 UIPageViewController 上设置 viewControllers 属性 - 您正在实例化一个全新的 UIPageViewController 来自与屏幕上显示的任何 Controller 无关的 Storyboard。

一个解决方案是在每个 subview Controller 中创建对 UIPageViewController 的引用，如下所示:

weak var pageViewController: UIPageViewController?

在您的 dataSource 中，当您实现“之后”和“之前”方法时，即:pageViewController:viewControllerBeforeViewController: 和 pageViewController:viewControllerAfterViewController: 您需要创建新的 subview Controller ，然后将 pageViewController 属性设置为对“父”UIPageViewController 的引用。

然后，当您的@IBAction 方法被调用时，您可以像这样在pageViewController 上调用该方法:

let secondViewController = self.storyboard?.instantiateViewControllerWithIdentifier("NextViewController") as! UIViewController
let viewControllers: NSArray = [secondViewController]
pageViewController?.setViewControllers(viewControllers as [AnyObject], direction: UIPageViewControllerNavigationDirection.Forward, animated: true, completion: nil)

类似的东西应该可以工作。