72 lines
2.8 KiB
Swift
72 lines
2.8 KiB
Swift
//
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// UserListViewModel+Diffable.swift
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// Mastodon
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//
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// Created by MainasuK on 2022-5-17.
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//
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import UIKit
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import MastodonAsset
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import MastodonLocalization
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extension UserListViewModel {
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@MainActor
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func setupDiffableDataSource(
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tableView: UITableView,
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userTableViewCellDelegate: UserTableViewCellDelegate?
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) {
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diffableDataSource = UserSection.diffableDataSource(
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tableView: tableView,
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context: context,
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configuration: UserSection.Configuration(
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userTableViewCellDelegate: userTableViewCellDelegate
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)
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)
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// workaround to append loader wrong animation issue
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// set empty section to make update animation top-to-bottom style
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var snapshot = NSDiffableDataSourceSnapshot<UserSection, UserItem>()
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snapshot.appendSections([.main])
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snapshot.appendItems([.bottomLoader], toSection: .main)
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if #available(iOS 15.0, *) {
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diffableDataSource?.applySnapshotUsingReloadData(snapshot, completion: nil)
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} else {
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// Fallback on earlier versions
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diffableDataSource?.apply(snapshot, animatingDifferences: false)
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}
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// trigger initial loading
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stateMachine.enter(UserListViewModel.State.Reloading.self)
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userFetchedResultsController.$records
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.receive(on: DispatchQueue.main)
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.sink { [weak self] records in
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guard let self = self else { return }
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guard let diffableDataSource = self.diffableDataSource else { return }
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var snapshot = NSDiffableDataSourceSnapshot<UserSection, UserItem>()
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snapshot.appendSections([.main])
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let items = records.map { UserItem.user(record: $0) }
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snapshot.appendItems(items, toSection: .main)
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if let currentState = self.stateMachine.currentState {
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switch currentState {
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case is State.Initial, is State.Idle, is State.Reloading, is State.Loading, is State.Fail:
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snapshot.appendItems([.bottomLoader], toSection: .main)
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case is State.NoMore:
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if items.isEmpty {
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snapshot.appendItems([.bottomHeader(text: L10n.Scene.Search.Searching.EmptyState.noResults)], toSection: .main)
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}
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default:
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assertionFailure()
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}
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} else {
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snapshot.appendItems([.bottomLoader], toSection: .main)
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}
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diffableDataSource.apply(snapshot, animatingDifferences: false)
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}
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.store(in: &disposeBag)
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}
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}
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