UICollectionView：页面控制的当前索引路径 [英] UICollectionView: current index path for page control

问题描述

我正在使用带有流布局的UICollectionView来显示单元格列表，我还有一个页面控件来指示当前页面，但似乎无法获取当前索引路径，我知道我可以看到单元格：

I'm using a UICollectionView with a flow layout to show a list of cells, I also have a page control to indicate current page, but there seems to be no way to get current index path, I know I can get visible cells:

UICollectionView当前可见单元格索引

然而，如果我将每个单元格占据屏幕的整个宽度，可以有多个可见单元格，如果我将其滚动到两半两个单元格，然后它们都是可见的，那么有没有办法只获得一个当前可见单元格的索引？

however there can be more than one visible cells, even if each of my cells occupies full width of the screen, if I scroll it to have two halves of two cells, then they are both visible, so is there a way to get only one current visible cell's index?

谢谢

推荐答案

您可以通过监视scrollViewDidScroll委托中的contentOffset获取当前索引

You can get the current index by monitoring contentOffset in scrollViewDidScroll delegate

它将是这样的

-(void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    NSInteger currentIndex = self.collectionView.contentOffset.x / self.collectionView.frame.size.width;

}

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