使用UICollectionViewCompositionalLayout时，节之间的垂直填充是使用NSCollectionLayoutSection上的contentInsets属性配置的。无论您使用的是列表配置还是自定义布局节定义，这都适用。
确保您正在使用UICollectionViewCompositionalLayout的节提供程序初始化器，以便您可以为每个列表节自定义NSCollectionLayoutSection上的属性。例如：

let layout = UICollectionViewCompositionalLayout { sectionIndex, layoutEnvironment in
    
    let listConfig = UICollectionLayoutListConfiguration(appearance: .insetGrouped)
    let section = NSCollectionLayoutSection.list(using: listConfig, layoutEnvironment: layoutEnvironment)

    // Remove the default vertical padding between sections
    var contentInsets = section.contentInsets
    contentInsets.top = 0
    contentInsets.bottom = 0
    section.contentInsets = contentInsets
    
    return section
}