54 lines
1.9 KiB
Swift
54 lines
1.9 KiB
Swift
//
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// PublicTimelineViewModel+Diffable.swift
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// Mastodon
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//
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// Created by sxiaojian on 2021/1/27.
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//
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import os.log
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import UIKit
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import CoreData
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import CoreDataStack
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extension PublicTimelineViewModel {
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func setupDiffableDataSource(
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for tableView: UITableView,
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dependency: NeedsDependency,
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timelinePostTableViewCellDelegate: TimelinePostTableViewCellDelegate
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) {
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let timestampUpdatePublisher = Timer.publish(every: 1.0, on: .main, in: .common)
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.autoconnect()
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.share()
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.eraseToAnyPublisher()
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diffableDataSource = TimelineSection.tableViewDiffableDataSource(
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for: tableView,
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dependency: dependency,
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managedObjectContext: fetchedResultsController.managedObjectContext,
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timestampUpdatePublisher: timestampUpdatePublisher,
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timelinePostTableViewCellDelegate: timelinePostTableViewCellDelegate)
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items.value = []
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}
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}
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// MARK: - NSFetchedResultsControllerDelegate
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extension PublicTimelineViewModel: NSFetchedResultsControllerDelegate {
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func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChangeContentWith snapshot: NSDiffableDataSourceSnapshotReference) {
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os_log("%{public}s[%{public}ld], %{public}s", ((#file as NSString).lastPathComponent), #line, #function)
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let indexes = tootIDs.value
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let toots = fetchedResultsController.fetchedObjects ?? []
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guard toots.count == indexes.count else { return }
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let items: [Item] = toots
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.compactMap { toot -> (Int, Toot)? in
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guard toot.deletedAt == nil else { return nil }
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return indexes.firstIndex(of: toot.id).map { index in (index, toot) }
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}
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.sorted { $0.0 < $1.0 }
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.map { Item.toot(objectID: $0.1.objectID) }
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self.items.value = items
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}
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}
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