使 UIScrollView 环绕

问题描述

可能重复:
UIScrollView.关于实施无限"的任何想法滚动/缩放?

我有一个有八页左右的 UIScroll.我的目标是让他们循环"，以便当用户到达最后一页时，第一页将是下一页(反之亦然)，以便用户可以无休止地滚动页面.实现这一目标的最佳方法是什么?

I have a UIScroll which has eight or so pages. My aim is for them to 'loop' around so that when the user reaches the last page the first page will be the next page (and vice versa) so that the user could scroll through the pages endlessly. What is the best way to achieve this?

我正在使用这个 示例 来自可可与爱.

I am working from this example from Cocoa with Love.

非常感谢任何帮助.谢谢.

Any help is greatly appreciated. Thank you.

推荐答案

问题已经解决.基本上，我在页面之前和之后创建了额外的页面，所以它看起来像这样:

Problem is sorted now. Basically, I created extra pages before and after my pages so it looks like this:

8 1 2 3 4 5 6 7 8 1

8 1 2 3 4 5 6 7 8 1

然后在 scrollViewDidEndDecelerating 我执行一个简单的 if 语句来检查我是在第一页还是最后一页并适当地找到 scrollView.

Then in the scrollViewDidEndDecelerating I do a simple if statement that checks if I am at either the first or last page and locate the scrollView appropriately.

- (void)scrollViewDidEndDecelerating:(UIScrollView *)newScrollView
{
    [self scrollViewDidEndScrollingAnimation:newScrollView];
    pageControl.currentPage = currentPage.pageIndex;

    if(currentPage.pageIndex==0){
        scrollView.contentOffset = CGPointMake(320*(pageControl.numberOfPages-2), 0);
        pageControl.currentPage = pageControl.numberOfPages-2;
    }else if(currentPage.pageIndex==pageControl.numberOfPages-1){
        scrollView.contentOffset = CGPointMake(320, 0);
        pageControl.currentPage = 1;
    }

}

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