Question

我的收藏夹视图有这个扩展，可以进行水平滚动，但我想在垂直滚动中更改它？

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
    }
}

通过这个扩展，即使他滚动因为启用了分页，我也试图让单元格坚持到视图的顶部。因此，每当用户滚动时，我希望单元格在用户滚动时粘在顶部等等。

Answer 1

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

即可

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
}

按照官方API：

UICollectionView

UICollectionViewFlowLayout

Swift 2集合视图扩展，用于水平滚动到垂直

1 个答案: