pageViewController上的背景图像反向重叠

Question

我有一个pageViewController显示每个索引的背景图像.它可以从左向右(向前)轻扫,但是当您反向滑动时,背景图像会相互重叠.在我实现背景图像之前,每个VC上的UI工作正常和反向,所以我知道它是背景图像.此外,如果我改为page curl而不是scroll在我的storyboard反向工作正常,只是不起作用scroll.这显然是一个已知的错误(从UIPageViewController中删除视图控制器)但是我需要一个Swift解决方案.

pageviewController:

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

        guard
            let currentPageViewController = viewController as? SinglePageViewController,
            let currentIndex = indexOfForecast(currentPageViewController.forecast!) as? Int where currentIndex != 0 else { return nil }  //fixed bug where index was -0 only on scroll

        return viewControllerAtIndex(currentIndex - 1)

    }

    func pageViewController(pageViewController: UIPageViewController, viewControllerAfterViewController viewController: UIViewController) -> UIViewController? {
        guard
            let lastForecast = forecasts?.last,
            let currentPageViewController = viewController as? SinglePageViewController, currentForecast = currentPageViewController.forecast,
            let currentIndex = indexOfForecast(currentForecast) as? Int where currentIndex != forecasts?.indexOf(lastForecast) else {return nil}

            return viewControllerAtIndex(currentIndex + 1)

    }

 func viewControllerAtIndex(index: Int) -> UIViewController? {
        if let forecast = forecasts?[index] {
            let time = forecastTimes[index]
            let imageURL = conditionsIcons[index]
            let backgroundImageName = backgroundImageNames.names[index]
            let storyboard = UIStoryboard(name: "Main", bundle: nil)
            let vc = storyboard.instantiateViewControllerWithIdentifier("SinglePageViewController") as! SinglePageViewController
            vc.forecast = forecast
            vc.time = time
            vc.imageURL = imageURL
            vc.backgroundImageName = backgroundImageName

            return vc
        }
        return nil
    }


    func showVC() {
        if let firstVC = viewControllerAtIndex(0) {
            busyAlertController.dismiss()
            let viewControllers = [firstVC]
            self.setViewControllers(viewControllers, direction: UIPageViewControllerNavigationDirection.Forward, animated: false, completion: nil)
        }
    }

singlePageViewController:

override func viewDidLoad() {
        super.viewDidLoad()

        backgroundImage = UIImageView(image: UIImage(named: backgroundImageName!))
        backgroundImage.contentMode = UIViewContentMode.ScaleAspectFill
        self.view.insertSubview(backgroundImage, atIndex: 0)
}

Answer 1

这个问题的答案很简单,只需clipsToBounds在图像上设置即可true