对于给定的布局，UICollectionView始终返回等于UICollectionView大小的内容大小，即使项目超出UICollectionView。

private lazy var layout: UICollectionViewCompositionalLayout = {
    let margin = 8.0
    let itemSize = NSCollectionLayoutSize(
        widthDimension: .fractionalWidth(1.0),
        heightDimension: .fractionalHeight(1.0)
    )
    let item = NSCollectionLayoutItem(layoutSize: itemSize)
    let groupSize = NSCollectionLayoutSize(
        widthDimension: .estimated(56),
        heightDimension: .fractionalHeight(1.0)
    )
    let group = NSCollectionLayoutGroup.horizontal(layoutSize: groupSize, subitems: [item])
    let section = NSCollectionLayoutSection(group: group)
    section.contentInsets = NSDirectionalEdgeInsets(top: .zero, leading: margin, bottom: .zero, trailing: margin)
    section.orthogonalScrollingBehavior = .continuous
    return UICollectionViewCompositionalLayout(section: section)
}()

此外，我怀疑，因为我不能编程滚动到屏幕以外的项目。这里会有什么问题呢？
我尝试更改item和组contentInsets的widthDimension，但不起作用。