forked from zelo72/mastodon-ios
65 lines
1.9 KiB
Swift
65 lines
1.9 KiB
Swift
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//
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// SettingFetchedResultController.swift
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// Mastodon
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//
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// Created by MainasuK Cirno on 2021-4-25.
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//
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import os.log
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import UIKit
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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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final class SettingFetchedResultController: NSObject {
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var disposeBag = Set<AnyCancellable>()
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let fetchedResultsController: NSFetchedResultsController<Setting>
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// input
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// output
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let settings = CurrentValueSubject<[Setting], Never>([])
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init(managedObjectContext: NSManagedObjectContext, additionalPredicate: NSPredicate?) {
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self.fetchedResultsController = {
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let fetchRequest = Setting.sortedFetchRequest
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fetchRequest.returnsObjectsAsFaults = false
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if let additionalPredicate = additionalPredicate {
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fetchRequest.predicate = additionalPredicate
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}
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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: 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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fetchedResultsController.delegate = self
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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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}
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// MARK: - NSFetchedResultsControllerDelegate
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extension SettingFetchedResultController: 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 objects = fetchedResultsController.fetchedObjects ?? []
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self.settings.value = objects
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}
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}
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