Ios containerView中嵌入的PageViewController显示以前视图的小范围

我创建了一个带有containerView的viewController，其中嵌入了一个pageViewController。在这个pageController中，我在其中添加了3个ViewController。这似乎很好，但是每次我滑动到下一个视图时，它似乎会在上一个视图的一侧显示一点边距。这是什么原因造成的

ViewDidLoad

    if let firstViewController = orderedViewControllers.first {
        self.pageViewController?.setViewControllers([firstViewController],
            direction: .Forward,
            animated: true,
            completion: nil)
    }

newViewController

func newViewController(view: String) -> UIViewController {
    return UIStoryboard(name: "Main", bundle: nil).instantiateViewControllerWithIdentifier(view)
}

PageControllerDelegate

extension CameraViewController: UIPageViewControllerDataSource {
    func pageViewController(pageViewController: UIPageViewController,
        viewControllerBeforeViewController viewController: UIViewController) -> UIViewController? {
            guard let viewControllerIndex = orderedViewControllers.indexOf(viewController) else {
                return nil
            }

            let previousIndex = viewControllerIndex - 1

            // User is on the first view controller and swiped left to loop to
            // the last view controller.
            guard previousIndex >= 0 else {
                return orderedViewControllers.last
            }

            guard orderedViewControllers.count > previousIndex else {
                return nil
            }

            return orderedViewControllers[previousIndex]
    }

    func pageViewController(pageViewController: UIPageViewController,
        viewControllerAfterViewController viewController: UIViewController) -> UIViewController? {
            guard let viewControllerIndex = orderedViewControllers.indexOf(viewController) else {
                return nil
            }

            let nextIndex = viewControllerIndex + 1
            let orderedViewControllersCount = orderedViewControllers.count

            // User is on the last view controller and swiped right to loop to
            // the first view controller.
            guard orderedViewControllersCount != nextIndex else {
                return orderedViewControllers.first
            }

            guard orderedViewControllersCount > nextIndex else {
                return nil
            }

            return orderedViewControllers[nextIndex]
    }
}

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您可能会谈论页面间距。您可以在故事板中编辑它。选择页面视图控制器，然后打开属性检查器。将有相应的部分：