CODEWITHSUNDEEP
iosswiftuicollectionviewuicollectionviewcompositionallayoutdiffabledatasource
Dyachenko
Dyachenko

Reputation: 3

CollectionView change scroll position when cell expanding using diffable datasource

I am using a diffable datasource with a compositional layout. My CollectionView has expandable cells. When I try to update the cell's expanded state using applySnapshot with animation, the CollectionView changes its scroll position. However, when I do this without animation, everything works fine, and the scroll position does not change when the cell height is updated. How can I do this with animation? It is my section layout configuration:

private func makeSectionlayout(environment: NSCollectionLayoutEnvironment) -> NSCollectionLayoutSection {
        let itemWidth = view.frame.width - Constants.Layout.sectionInsets.horizontal
        let itemSize = NSCollectionLayoutSize(widthDimension: .absolute(itemWidth),
                                              heightDimension: .estimated(400))
        let item = NSCollectionLayoutItem(layoutSize: itemSize)
        
        let groupWidth = environment.container.contentSize.width - Constants.Layout.sectionInsets.horizontal
        let groupSize = NSCollectionLayoutSize(widthDimension: .absolute(groupWidth),
                                               heightDimension: .estimated(400))
        let group = NSCollectionLayoutGroup.vertical(layoutSize: groupSize, subitems: [item])
        group.interItemSpacing = .fixed(16)
        
        let section = NSCollectionLayoutSection(group: group)
        section.contentInsets = Constants.Layout.sectionInsets
        section.interGroupSpacing = 16
        
        return section
    }

Upvotes: 0

Views: 21

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