ios - tvOS - UICollectionViewCompositionalLayout pin 选择的 ROW 到 TOP

编程问答 2022-04-24

问题描述

我有一个 UICollectionViewCompositionalLayout 实现如下：

let rowSection: NSCollectionLayoutSection = {
    let inset: CGFloat = 2.5

    // Item
    let itemSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1),heightDimension: .fractionalHeight(1))
    let item = NSCollectionLayoutItem(layoutSize: itemSize)
    item.contentInsets = NSDirectionalEdgeInsets(top: inset,leading: inset,bottom: inset,trailing: inset)

    // Group
    let groupSize = NSCollectionLayoutSize(widthDimension: .absolute(422),heightDimension: .absolute(244))
    let group = NSCollectionLayoutGroup.horizontal(layoutSize: groupSize,subitems: [item])

    // Section
    let section = NSCollectionLayoutSection(group: group)
    section.contentInsets = NSDirectionalEdgeInsets(top: inset,trailing: inset)
    section.orthogonalScrollingBehavior = .groupPaging

    return section
}()

当我垂直滚动时，我希望将选定的单元格固定在视图顶部，我尝试使用 self.collectionView.scrollToItem(at: nextIndexPath,at: .top,animated: true) 但它没有效果....我选定的单元格保持垂直居中.. ..

Magenta cell is selected

我怎么能做到这一点？

解决方法

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