Swift 2 collection 水平滚动到垂直的视图扩展

Question

我的 collection 视图有这个扩展，可以进行水平滚动，但我想在垂直滚动时更改它？？

extension viewRe : UIScrollViewDelegate
{
    func scrollViewWillEndDragging(scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>)
    {
        let layout = self.recipesCollView?.collectionViewLayout as! UICollectionViewFlowLayout
        let cellWidthIncludingSpacing = layout.itemSize.width + layout.minimumLineSpacing

        var offset = targetContentOffset.memory
        let index = (offset.x + scrollView.contentInset.left) / cellWidthIncludingSpacing
        let roundedIndex = round(index)

        offset = CGPoint(x: roundedIndex * cellWidthIncludingSpacing - scrollView.contentInset.left, y: -scrollView.contentInset.top)
        targetContentOffset.memory = offset
    }
}

有了这个扩展，我试图让单元格粘在视图的顶部，即使他滚动时也是如此，因为分页已启用。因此，无论何时用户滚动，我都希望单元格粘在顶部，等等，当用户滚动时。

Answer 1

@donnyWals 是对的。如果您使用 UICollectionView 只需更改其 UICollectionViewFlowLayout

let layout = UICollectionViewFlowLayout()
layout.scrollDirection = . Horizontal
let collectionView = UICollectionView(frame: frame, collectionViewLayout: layout)

或者如果您有 UICollectionView

if let layout = collectionView.collectionViewLayout as? UICollectionViewFlowLayout {
    layout.scrollDirection = .Horizontal
}

关注官方API:

UICollectionView

UICollectionViewFlowLayout

Swift 2 collection 水平滚动到垂直的视图扩展

Swift 2 collection view extension for horizontal scroll to vertical

uiscrollviewdelegate

uicollectionview

uicollectionviewlayout

swift2