在UIPageViewController中控制器后面的黑色背景

Question

我有一个简单的UIPageViewController有3页，这些都是ViewControllers中嵌入的NavigationControllers。

滚动浏览这些页面时，右侧页面在整个滚动过程中背后有黑色背景。当控制器卡入到位后，它会恢复正常。

Here's how it looks.

我该如何解决？？

求助：在UIPageViewController的子类：self.view.backgroundColor = .white

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：在NavigationControllers或PageViewController后面放置一个视图没有帮助。无论PageViewController背景的颜色是什么，颜色总是黑色。

Answer 1

子类UIPageViewController和viewDidLoad()称为self.view.backgroundColor = .white。这应该可以解决您的问题。