Question

我有一个带有3个页面的简单UIPageViewController，它们全部ViewControllers嵌入在NavigationControllers中。

当我滚动浏览这些页面时，在整个滚动过程中，右侧页面的背后都有黑色背景。控制器卡入到位后，它将恢复正常。

我该如何解决？

已解决：UIPageViewController的子类中：self.view.backgroundColor = .white

代码：

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

    let yesterdayVC = sb.instantiateViewController(withIdentifier: "Yesterday")
    let todayVC = sb.instantiateViewController(withIdentifier: "Today")
    let tomorrowVC = sb.instantiateViewController(withIdentifier: "Tomorrow")

    return [yesterdayVC, todayVC, tomorrowVC]
}()

override func viewDidLoad() {
    super.viewDidLoad()

    self.dataSource = self
    setViewControllers([viewControllerList[1]], direction: .forward, animated: true, completion: nil)
}

func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {

    guard let vcIndex = viewControllerList.firstIndex(of: viewController) else { return nil }

    let previousIndex = vcIndex - 1

    guard previousIndex >= 0 else { return nil }
    guard viewControllerList.count > previousIndex else { return nil }

    return viewControllerList[previousIndex]
}

func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {

    guard let vcIndex = viewControllerList.firstIndex(of: viewController) else { return nil }

    let nextIndex = vcIndex + 1

    guard viewControllerList.count > nextIndex else { return nil }

    return viewControllerList[nextIndex]
}

编辑：将视图置于NavigationControllers或PageViewController后面无济于事。无论PageViewController背景是什么颜色，颜色始终为黑色。

Answer 1

将UIPageViewController子类化，并在viewDidLoad()中调用self.view.backgroundColor = .white。这应该可以解决您的问题。

Answer 2

UIPageViewController的视图是透明的，因此您看到的黑色是窗口。因此，只需在您的应用程序委托或场景委托中更改Windows背景颜色，例如

self.window.backgroundColor = UIColor.whiteColor;

UIPageViewController中的控制器后面的黑色背景

2 个答案: