layoutSection.swift

func layoutSection() -> NSCollectionLayoutSection {
        
        var setWidthColumn: CGFloat = 0
        var setHeight: CGFloat = 0
        if column == 2 {
            setWidthColumn = 0.5
            setHeight = 0.75
        } else if column == 3 {
            setWidthColumn = 0.33
            setHeight = 0.5
        } else {
            setWidthColumn = 0.5
            setHeight = 0.75
        }
        
        let itemSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(setWidthColumn),
                                             heightDimension: .fractionalHeight(1.0))
        let item = NSCollectionLayoutItem(layoutSize: itemSize)
        item.contentInsets = NSDirectionalEdgeInsets(top: 4, leading: 4, bottom: 4, trailing: 4)

        let groupSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1.0),
                                               heightDimension: .fractionalWidth(setHeight))
        let group = NSCollectionLayoutGroup.horizontal(layoutSize: groupSize,
                                                         subitems: [item])

        let section = NSCollectionLayoutSection(group: group)
        section.contentInsets = NSDirectionalEdgeInsets(top: 18, leading: 0, bottom: 18, trailing: 0)
        return section
    }