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我一直在尝试创建一个具有3个视图的开放场景,这些视图嵌入在页面视图控制器中。我们的目标是创建一些类似Instagram的内容,其中您的社交媒体馈送位于中间,然后当您向右滑动时,它会将您引导至视图,如果向左滑动,则会将您带到不同的视图。然而,用我目前的代码,视图控制器无限地滑动,我想知道是否有人知道如何解决这个问题。取出页面视图控制器设置的无限循环
这里是我的当前设置的样子: Current Setup of Page Views
这是我多么希望它看起来像: What I want the functionality to be
这里是我的网页浏览器的代码。我有一个主页面视图控制器连接其他2个视图。
class HomeRootPageViewController: UIPageViewController, UIPageViewControllerDataSource, UIPageViewControllerDelegate {
lazy var viewControllerArray: [UIViewController] = {
return [self.ViewControllerInstance(name: "FeedViewController"),
self.ViewControllerInstance(name: "DMViewController"),
self.ViewControllerInstance(name: "ProfileViewController")]
}()
private func ViewControllerInstance(name: String) -> UIViewController {
return UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: name)
}
override func viewDidLoad() {
super.viewDidLoad()
self.dataSource = self
self.delegate = self
if let firstViewController = viewControllerArray.first {
setViewControllers([firstViewController], direction: .forward, animated: true, completion: nil)
}
}
public func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
guard let viewControllerIndex = viewControllerArray.index(of: viewController) else {
return nil
}
let previousIndex = viewControllerIndex - 1
guard previousIndex >= 0 else {
return viewControllerArray.last
}
guard viewControllerArray.count > previousIndex else {
return nil
}
return viewControllerArray[previousIndex]
}
public func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
guard let viewControllerIndex = viewControllerArray.index(of: viewController) else {
return nil
}
let nextIndex = viewControllerIndex + 1
guard nextIndex < viewControllerArray.count else {
return viewControllerArray.first
}
guard viewControllerArray.count > nextIndex else {
return nil
}
return viewControllerArray[nextIndex]
}
}
任何帮助,将不胜感激!
导致此行崩溃:return viewControllerArray [previousIndex]。错误表示致命错误:索引超出范围。 –
也许反转viewControllerArray.last和viewControllerArray.first位置。因为如果索引低于0你想显示的第一页不是最后的 – Nitrousjp
或者只是返回零 – Nitrousjp