UIPageViewController：获取currentPage [英] UIPageViewController: get the currentPage

问题描述

过去几天我一直在努力解决这个问题，经过所有这些杂耍，我发现我只需要数据源方法的当前索引来更新当前可见的页码

I have been struggling with this issue for the last few days and after all this juggling I have figured out that all I need is the current Index from the datasource method to update with current visible page number

我有这个 UIPageViewController 数据源方法，我需要使用当前索引来获取委托方法的当前可见页面previousViewControllers transitionCompleted：（BOOL）完成

I have this UIPageViewController datasource method and I need to use the current index to get the current visible page for delegate method previousViewControllers transitionCompleted:(BOOL)completed

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController
   viewControllerAfterViewController:(UIViewController *)viewController { 
    NSString *path = [[NSBundle mainBundle] pathForResource:@"pages" ofType:@"pdf"];

    NSURL *pdfurl = [NSURL fileURLWithPath:path];
    PDFDocument = CGPDFDocumentCreateWithURL((__bridge CFURLRef)pdfurl);

    contentViewController = [[ContentViewController alloc] initWithPDFAtPath:path];

    currentIndex = [modelArray indexOfObject:[(ContentViewController *)viewController page]];

    if (currentIndex == totalPages - 1) {  
        return nil;
    }

    contentViewController.page = [modelArray objectAtIndex:currentIndex + 1];

    return contentViewController;
}

我对如何将当前索引语句从datasource方法写入委托方法更新当前可见页面。

I'm confused about how to write the current index statement from datasource method into delegate method to update current visible page.

- (void)pageViewController:(UIPageViewController *)pageViewController didFinishAnimating:(BOOL)finished previousViewControllers:(NSArray *)previousViewControllers transitionCompleted:(BOOL)completed{

    if (!completed)
    {
        return;
    }

    //currentIndex = [[self.pageViewController.viewController lastObject]];  
    currentIndex = [self indexOfObject:contentViewController];

    [self displaycurrentIndex:currentIndex];
    //self.pageControl.currentPage = currentIndex;
}

我该如何更正？

推荐答案

看起来您应该能够获得当前索引：

It looks like you should be able to get the current index with:

ContentViewController *viewController = [self.pageViewController.viewControllers lastObject];
currentIndex = [modelArray indexOfObject:[viewController page]];

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