mastodon-ios/Mastodon/Diffiable/Search/SearchSection.swift

68 lines
2.3 KiB
Swift

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