UIPageViewController setViewControllers，UIPageControl没有显示正确的当前号码

Question

我'使用带有水平滚动一个UIPageViewController ......只要用户滚动时，UIPageControl正常工作，程序跳转到下一个或前一个页面时出现问题

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

比起UIPageControl的指数是不正确的（我会自己提供的指数，但不能访问UIPageViewController的UIPageControl）

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

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

如何获得当以编程方式更改UIPageViewController页面时，UIPageControl右侧的当前点索引？

Answer 1

OK，原来，我误会了一个委托方法

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