ios - UIPageViewController setViewControllers，UIPageControl 未显示正确的当前编号

Question

我正在使用具有水平滚动功能的 UIPageViewController...只要用户滚动，UIPageControl 就会正常工作，以编程方式跳转到下一页或上一页时会出现问题

[self.pageViewController setViewControllers:@[[self viewControllerWithIndex:index]] direction:UIPageViewControllerNavigationDirectionReverse animated:YES completion:nil];

UIPageControl 的索引不对(我会自己提供索引，但是无法访问UIPageViewController 的UIPageControl)

- (NSInteger)presentationCountForPageViewController:(UIPageViewController *)pageViewController {
    return IntroScreensCount;
}

- (NSInteger)presentationIndexForPageViewController:(UIPageViewController *)pageViewController {
    return 0;
}

如何在以编程方式更改 UIPageViewController 页面时正确获取 UIPageControl 的当前点索引？

Answer 1

好的，原来我误解了一个委托(delegate)方法

- (NSInteger)presentationIndexForPageViewController:(UIPageViewController *)pageViewController {
    return [(IntroPageViewController *)[pageViewController.viewControllers firstObject] index];
}