ios - 如何在 UIPageViewController 中从一页动画到另一页时设置 View 的背景颜色

Question

在我的UIPageViewController中，我想在从一个页面拖动到另一页面时设置不同的背景颜色。所以我的默认颜色将在那里，但会在不同的索引过渡上显示不同的颜色。目前，在我的 UIPageViewControllerDelegate 下，我正在获取当前页面的索引号:

func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) {

        if let firstViewController = viewControllers?.first,
            let index = orderedViewControllers.index(of: firstViewController) {
            viewControllerDelegate?.pageViewController(pageViewController: self, didUpdatePageIndex: index)

            if index == 0 {

                (parent as? MainViewController)?.container.backgroundColor = UIColor.red
            }
            else if index == 1 {

                (parent as? MainViewController)?.container.backgroundColor = UIColor.black
            }

        }


    }

但是我如何设置它们之间的颜色。

Answer 1

将其添加到didFinishLaunchingWithOptions中

UIPageControl *pageControl = [UIPageControl appearance];
pageControl.pageIndicatorTintColor = [UIColor blueColor];
pageControl.currentPageIndicatorTintColor = [UIColor redColor];
pageControl.backgroundColor = [UIColor blackColor];

如果您想设置外观，请添加以下行:

UIPageControl *pageControl = [UIPageControl appearanceWhenContainedIn:[MyViewController class], nil];