Question

当我在第二页中点击新单元格时，我有collectionView返回第一个单元格。

虽然它应该是第二页，但我在第二页中得到Page 0.0，在第一页得到0.0。

func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {

        let pageWidth = collectionCustom.frame.size.width
        let page = floor((collectionCustom.contentOffset.x - pageWidth / 2) / pageWidth) + 1

        print("Page number: \(page)")

    }

我在didSelectItem方法中没有发生任何事情，为什么我会得到那个滚动？

func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: (inout CGPoint)) {

        let pageWidth: Float = Float(collectionCustom.frame.width)
        // width + space
        let currentOffset: Float = Float(collectionCustom.contentOffset.x)
        let targetOffset: Float = Float(targetContentOffset.x)
        var newTargetOffset: Float = 0
        if targetOffset > currentOffset {
            newTargetOffset = ceilf(currentOffset / pageWidth) * pageWidth
        }
        else {
            newTargetOffset = floorf(currentOffset / pageWidth) * pageWidth
        }
        if newTargetOffset < 0 {
            newTargetOffset = 0
        }
        else if newTargetOffset > Float(collectionCustom.contentSize.width) {
            newTargetOffset = Float(collectionCustom.contentSize.width)
        }

        targetContentOffset.x = CGFloat(currentOffset)
        collectionCustom.setContentOffset(CGPoint(x: CGFloat(newTargetOffset), y: CGFloat(0)), animated: true)

        var index: Int = Int(newTargetOffset / pageWidth)

        var cell: UICollectionViewCell? = collectionCustom.cellForItem(at: IndexPath(item: index, section: 0))

        cell = collectionCustom.cellForItem(at: IndexPath(item: index + 1, section: 0))

        }

    }

Answer 1

如果您想要当前页面，那么您应该从scrollview页面获取此页

 func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {

    let pageNumber = round(scrollView.contentOffset.x / collectionCustom.frame.width) // You can change width according you 
    pageControl.currentPage = Int(pageNumber)

}

点按后启用分页的UICollectionView滚动问题

1 个答案: