iOS 13 UICollectionViewCompositionalLayout组中的项目数无限

Question

据我了解，每个NSCollectionLayoutGroup都是通过为其父组指定的顺序呈现的，每个组还可以通过使用open class func vertical(layoutSize: NSCollectionLayoutSize, subitem: NSCollectionLayoutItem, count: Int) -> Self来决定每个组以其类型呈现多少个项目。关于这一点，我想知道在渲染所有先前的项目之后是否可以渲染无限数量的项目（NSCollectionLayoutItem）。

所需的版式

---------- <- 1 item
|    |     <- 2 items
---------- <- infinite item
----------
----------
----------

尽管没有给出计数，当前下面的代码仅显示defaultSection

private func createLayout2() -> UICollectionViewLayout {
        let layout = UICollectionViewCompositionalLayout { (sectionIndex, layoutEnv) -> NSCollectionLayoutSection? in

            let item = NSCollectionLayoutItem(
                layoutSize: NSCollectionLayoutSize(
                    widthDimension: .fractionalWidth(1.0),
                    heightDimension: .fractionalHeight(1.0)
                )
            )
            item.contentInsets = .init(top: 8, leading: 8, bottom: 8, trailing: 8)

            // Featured
            let bigSection = NSCollectionLayoutGroup.vertical(
                layoutSize: NSCollectionLayoutSize(
                    widthDimension: .fractionalWidth(1.0), heightDimension: .absolute(400)
                ),
                subitem: item, count: 1
            )

            // Two tiles
            let tileSecton = NSCollectionLayoutGroup.horizontal(
                layoutSize: NSCollectionLayoutSize(
                    widthDimension: .fractionalWidth(1.0), heightDimension: .absolute(200)
                ),
                subitem: item, count: 2
            )

            // Default items in list
            let defaultSection = NSCollectionLayoutGroup.vertical(
                layoutSize: NSCollectionLayoutSize(
                    widthDimension: .fractionalWidth(1.0), heightDimension: .absolute(200)
                ),
                subitems: [item]
            )

            // Section
            let group = NSCollectionLayoutGroup.vertical(
                layoutSize: NSCollectionLayoutSize(
                    widthDimension: .fractionalWidth(1.0), heightDimension: .fractionalHeight(1.0)
                ),
                subitems: [bigSection, tileSecton, defaultSection]
            )

            return NSCollectionLayoutSection(group: group)
        }
        return layout
    }