使用 UICollectionLayoutListConfiguration 的特定部分的部分标题答案

【问题标题】：Section Header For Particular Section Using UICollectionLayoutListConfiguration使用 UICollectionLayoutListConfiguration 的特定部分的部分标题
【发布时间】：2021-12-18 11:28:31
【问题描述】：

我有一个UICollectionView，有两个部分使用UICollectionLayoutListConfiguration。我只想为其中一个特定部分设置一个标题。

收藏视图

lazy var collectionView: UICollectionView = {
    var list = UICollectionLayoutListConfiguration(appearance: .insetGrouped)
    list.headerMode = .supplementary
    let layout = UICollectionViewCompositionalLayout.list(using: list)
    let view = UICollectionView(frame: .zero, collectionViewLayout: layout)
    // REGISTER CELLS ETC...
    return view
}()

数据源

dataSource.supplementaryViewProvider = { [weak self] collectionView, kind, indexPath in
    guard let self = self else { return nil }
    
        
    if let section = Section(rawValue: indexPath.section) {
        switch section {
        case .topSection:
            // I DO NOT HAVE ANY HEADER FOR THIS SECTION
        case .bottomSection:
            switch kind {
            case UICollectionView.elementKindSectionHeader:
                // RETURN SECTION HEADER HERE
            case UICollectionView.elementKindSectionFooter:
                // I DO NOT HAVE ANY FOOTERS
            default:
                fatalError("SOMETHING BAD HAPPENED")
            }
        }
    }

接下来我可以尝试什么来解决这个问题？

【问题讨论】：

标签： ios swift uicollectionview uicollectionviewcompositionallayout uicollectionlayoutlistconfiguration

【解决方案1】：

解决了。

我需要为UICollectionViewCompositionalLayout 中的每个部分类型返回一个NSCollectionLayoutSection，这无法在数据源中完成。

private func setUpLayout() -> UICollectionViewLayout {
        let layout = UICollectionViewCompositionalLayout { [unowned self] sectionIndex, layoutEnvironment in
            let section = Section(rawValue: sectionIndex)
            switch section {
            case .task:
                return self.setUpSection(layoutEnvironment: layoutEnvironment)
            case .project:
                return self.setUpHeaderSection(layoutEnvironment: layoutEnvironment)
            case .completed:
                return self.setUpHeaderSection(layoutEnvironment: layoutEnvironment)
            default:
                return self.setUpHeaderSection(layoutEnvironment: layoutEnvironment)
            }
        }
        return layout
    }
    
private func setUpSection(layoutEnvironment: NSCollectionLayoutEnvironment) -> NSCollectionLayoutSection {
        var listConfiguration = UICollectionLayoutListConfiguration(appearance: .insetGrouped)
        listConfiguration.headerMode = .none
        return NSCollectionLayoutSection.list(using: listConfiguration, layoutEnvironment: layoutEnvironment)
    }
    
private func setUpHeaderSection(layoutEnvironment: NSCollectionLayoutEnvironment) -> NSCollectionLayoutSection {
        var listConfiguration = UICollectionLayoutListConfiguration(appearance: .insetGrouped)
        listConfiguration.headerMode = .supplementary
        return NSCollectionLayoutSection.list(using: listConfiguration, layoutEnvironment: layoutEnvironment)
    }

【讨论】：

【解决方案2】：

将标题高度设置为零。对于“referenceSizeForHeaderInSection”中的特定部分

【讨论】：

我使用的是 UICollectionViewDiffableDataSource 而不是传统的 UICollectionViewDataSource