forked from zelo72/mastodon-ios
96 lines
3.1 KiB
Swift
96 lines
3.1 KiB
Swift
//
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// PublicTimelineViewModel.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 GameplayKit
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import Combine
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import CoreData
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import CoreDataStack
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import MastodonSDK
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import AlamofireImage
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class PublicTimelineViewModel: NSObject {
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var disposeBag = Set<AnyCancellable>()
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// input
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let context: AppContext
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let fetchedResultsController: NSFetchedResultsController<Toot>
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weak var tableView: UITableView?
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// output
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var diffableDataSource: UITableViewDiffableDataSource<TimelineSection, Item>?
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let tootIDs = CurrentValueSubject<[String], Never>([])
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let items = CurrentValueSubject<[Item], Never>([])
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var cellFrameCache = NSCache<NSNumber, NSValue>()
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init(context: AppContext) {
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self.context = context
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self.fetchedResultsController = {
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let fetchRequest = Toot.sortedFetchRequest
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fetchRequest.predicate = Toot.predicate(idStrs: [])
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fetchRequest.returnsObjectsAsFaults = false
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fetchRequest.fetchBatchSize = 20
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let controller = NSFetchedResultsController(
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fetchRequest: fetchRequest,
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managedObjectContext: context.managedObjectContext,
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sectionNameKeyPath: nil,
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cacheName: nil
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)
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return controller
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}()
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super.init()
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self.fetchedResultsController.delegate = self
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items
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.receive(on: DispatchQueue.main)
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.debounce(for: .milliseconds(300), scheduler: DispatchQueue.main)
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.sink { [weak self] items 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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os_log("%{public}s[%{public}ld], %{public}s: items did change", ((#file as NSString).lastPathComponent), #line, #function)
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var snapshot = NSDiffableDataSourceSnapshot<TimelineSection, Item>()
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snapshot.appendSections([.main])
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snapshot.appendItems(items)
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diffableDataSource.apply(snapshot, animatingDifferences: !items.isEmpty)
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}
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.store(in: &disposeBag)
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tootIDs
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.receive(on: DispatchQueue.main)
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.sink { [weak self] ids in
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guard let self = self else { return }
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self.fetchedResultsController.fetchRequest.predicate = Toot.predicate(idStrs: ids)
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do {
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try self.fetchedResultsController.performFetch()
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} catch {
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assertionFailure(error.localizedDescription)
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}
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}
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.store(in: &disposeBag)
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}
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deinit {
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os_log("%{public}s[%{public}ld], %{public}s", ((#file as NSString).lastPathComponent), #line, #function)
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}
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}
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extension PublicTimelineViewModel {
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func fetchLatest() -> AnyPublisher<Mastodon.Response.Content<[Mastodon.Entity.Toot]>, Error> {
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return context.apiService.publicTimeline(count: 20, domain: "mstdn.jp")
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}
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}
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