67 lines
2.7 KiB
Swift
67 lines
2.7 KiB
Swift
//
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// FollowingListViewModel+Diffable.swift
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// Mastodon
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//
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// Created by Cirno MainasuK on 2021-11-2.
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//
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import UIKit
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extension FollowingListViewModel {
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func setupDiffableDataSource(
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for tableView: UITableView,
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dependency: NeedsDependency
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) {
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diffableDataSource = UserSection.tableViewDiffableDataSource(
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for: tableView,
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dependency: dependency,
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managedObjectContext: userFetchedResultsController.fetchedResultsController.managedObjectContext
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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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userFetchedResultsController.objectIDs
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.receive(on: DispatchQueue.main)
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.sink { [weak self] objectIDs 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: [UserItem] = objectIDs.map {
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UserItem.following(objectID: $0)
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}
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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.Idle, 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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guard let activeMastodonAuthenticationBox = self.context.authenticationService.activeMastodonAuthenticationBox.value,
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let userID = self.userID.value,
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userID != activeMastodonAuthenticationBox.userID
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else { break }
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let text = L10n.Scene.Following.footer
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snapshot.appendItems([.bottomHeader(text: text)], toSection: .main)
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default:
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break
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}
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}
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diffableDataSource.apply(snapshot)
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}
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.store(in: &disposeBag)
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}
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}
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