67 lines
2.3 KiB
Swift
67 lines
2.3 KiB
Swift
//
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// SearchSection.swift
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// Mastodon
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//
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// Created by MainasuK on 2022-1-18.
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//
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import UIKit
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import MastodonSDK
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import MastodonLocalization
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enum SearchSection: Hashable {
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case trend
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}
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extension SearchSection {
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static func diffableDataSource(
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collectionView: UICollectionView,
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context: AppContext
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) -> UICollectionViewDiffableDataSource<SearchSection, SearchItem> {
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let trendCellRegister = UICollectionView.CellRegistration<TrendCollectionViewCell, Mastodon.Entity.Tag> { cell, indexPath, item in
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}
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let dataSource = UICollectionViewDiffableDataSource<SearchSection, SearchItem>(
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collectionView: collectionView
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) { collectionView, indexPath, item in
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switch item {
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case .trend(let hashtag):
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let cell = collectionView.dequeueConfiguredReusableCell(
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using: trendCellRegister,
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for: indexPath,
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item: hashtag
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)
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return cell
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}
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}
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let trendHeaderRegister = UICollectionView.SupplementaryRegistration<TrendSectionHeaderCollectionReusableView>(elementKind: UICollectionView.elementKindSectionHeader) { supplementaryView, elementKind, indexPath in
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// do nothing
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}
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dataSource.supplementaryViewProvider = { [weak dataSource] (collectionView: UICollectionView, elementKind: String, indexPath: IndexPath) in
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let fallback = UICollectionReusableView()
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guard let dataSource = dataSource else { return fallback }
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let sections = dataSource.snapshot().sectionIdentifiers
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guard indexPath.section < sections.count else { return fallback }
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let section = sections[indexPath.section]
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switch elementKind {
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case UICollectionView.elementKindSectionHeader:
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switch section {
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case .trend:
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return collectionView.dequeueConfiguredReusableSupplementary(using: trendHeaderRegister, for: indexPath)
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}
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default:
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assertionFailure()
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return fallback
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}
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}
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return dataSource
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} // end func
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}
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