swift - 带有分页的 UICollectionViewCompositionalLayout - header + cell = fractionalHeight(1)
问题描述
在构建组合部分以强制标题加上部分高度为 .fractionalHeight(1) 时,有什么办法吗?
我正在尝试使 collectionView 垂直分页,因此每个“页面”都显示一个标题单元格和一个可能垂直移动的单个部分单元格。
static func fullHeightSectionLayoutWithHeader(padding: CGFloat) -> UICollectionViewCompositionalLayout {
return UICollectionViewCompositionalLayout { (sectionNumber, env)
-> NSCollectionLayoutSection? in
let item = NSCollectionLayoutItem(layoutSize: .init(widthDimension: .fractionalWidth(1),
heightDimension: .fractionalHeight(1) ) )
let groupSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1), heightDimension: .fractionalHeight(1) )
let group = NSCollectionLayoutGroup.vertical(layoutSize: groupSize, subitems: [item])
let section = NSCollectionLayoutSection(group: group)
let headerSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1), heightDimension: .estimated(50.0))
let header = NSCollectionLayoutBoundarySupplementaryItem(layoutSize: headerSize,
elementKind: UICollectionView.elementKindSectionHeader,
alignment: .top)
section.boundarySupplementaryItems = [header]
return section
}
}
所以这显示了一个 50px 的标题,然后该部分从屏幕底部绘制 50px,然后抛出 collectionView 的分页。
有没有办法将标题的高度指定为 50px,然后填充剩余高度的部分?也许我遗漏了一些东西,或者我必须用估计的高度来做这件事,并在单元格布局期间设置实际高度?
提前致谢!
解决方案
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