如何让 UIPageViewController 自动切换控制器

Question

我正在关注 Duc Tran 关于 UIPageViewController 的精彩教程。我想知道如何在不让用户滑动的情况下使 UIPageViewController 中的控制器自动转换。这就是代码在没有委托和数据源的情况下的样子。

class AnimesPageVC: UIPageViewController {
override var navigationOrientation: UIPageViewControllerNavigationOrientation {return .horizontal}

weak var pageViewControllerDelegate: AnimePagesVCDelegate?

var timeInterval: Int?

var images: [UIImage]?


lazy var animes: [UIViewController] = {
    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    var animes = [UIViewController]()

    if let images = self.images {
        for image in images {
            let anime = storyboard.instantiateViewController(withIdentifier: "AnimeImage")

            animes.append(anime)
        }
    }
    self.pageViewControllerDelegate?.setUpPageController(numberOfPages: animes.count)

    return animes
}()

override func viewDidLoad() {
    super.viewDidLoad()

    delegate = self
    dataSource = self

    loadPage(atIndex: 0)
}

func loadPage(atIndex: Int) {
    let anime = animes[atIndex]
    var direction = UIPageViewControllerNavigationDirection.forward
    if let currentAnime = viewControllers?.first {
        if let currentIndex = animes.index(of: currentAnime) {
            if currentIndex > atIndex {
                direction = .reverse
            }
        }
    }

    configurePages(viewController: anime)

    setViewControllers([anime], direction: direction, animated: true, completion: nil)
}

func configurePages(viewController: UIViewController) {
    for (index, animeVC) in animes.enumerated() {
        if viewController === animeVC {
            if let anime = viewController as? AnimeVC {
                anime.image = self.images?[index]
                self.pageViewControllerDelegate?.turnPageController(to: index)
            }
        }
    }
  }
}

那么我怎么能得到这种行为。将不胜感激任何帮助。 :)

Answer 1

在视图中添加一个计时器确实加载并使用更新的索引调用相同的加载函数

Timer.scheduledTimer(withTimeInterval: 0.3, repeats: true) { (_) in
        // call your function here
        self.loadPage(atIndex: index + 1)
        // you have to update your index also.
        self.index = self.index + 1
    }

这将每 0.3 秒调用一次 loadPage 函数

请记住，如果您只进入下一页，我的解决方案仅适用于一种方式，因为我自动添加它不会返回到之前的控制器，因为您已经执行了类似的操作

index = index - 1