如何防止集合视图在水平滚动方向上从左向右滚动？

let layout = UICollectionViewFlowLayout()
layout.scrollDirection = .vertical // 设置为垂直滚动
let collectionView = UICollectionView(frame: .zero, collectionViewLayout: layout)

func scrollViewDidScroll(_ scrollView: UIScrollView) {
    if scrollView.contentOffset.x != 0 {
        scrollView.contentOffset.x = 0
    }
}

class CustomFlowLayout: UICollectionViewFlowLayout {
    override func shouldInvalidateLayout(forBoundsChange newBounds: CGRect) -> Bool {
        return true
    }

    override func layoutAttributesForElements(in rect: CGRect) -> [UICollectionViewLayoutAttributes]? {
        let attributes = super.layoutAttributesForElements(in: rect)
        var newAttributes = [UICollectionViewLayoutAttributes]()
        
        for attribute in attributes ?? [] {
            if attribute.representedElementCategory == .cell {
                let newFrame = CGRect(x: 0, y: attribute.frame.origin.y, width: collectionViewContentSize.width, height: attribute.frame.height)
                attribute.frame = newFrame
            }
            newAttributes.append(attribute)
        }
        
        return newAttributes
    }
}