114 lines
3.9 KiB
Swift
114 lines
3.9 KiB
Swift
//
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// CoreDataSource.swift
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// AutoCat2
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//
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// Created by Selim Mustafaev on 27.03.2022.
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//
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import UIKit
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import CoreData
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import AutoCatCore
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import DifferenceKit
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protocol ConfigurableCell {
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associatedtype Item
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func configure(with item: Item)
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}
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typealias ConfigurableTableViewCell = UITableViewCell & ConfigurableCell
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class CoreDataSource<Item: NSManagedObject & Dated & Differentiable, Cell: ConfigurableTableViewCell>
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: NSObject, NSFetchedResultsControllerDelegate, UITableViewDataSource where Cell.Item == Item {
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private let cellIdentifier: String
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private let tableView: UITableView
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private let fetchedResults: NSFetchedResultsController<Item>
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private var sections: [DateSection<Item>] = []
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init(tableView: UITableView, context: NSManagedObjectContext, cellIdentifier: String = String(describing: Cell.self)) {
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self.tableView = tableView
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self.cellIdentifier = cellIdentifier
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if let fetchRequest = Item.fetchRequest() as? NSFetchRequest<Item> {
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fetchRequest.sortDescriptors = []
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self.fetchedResults = NSFetchedResultsController(fetchRequest: fetchRequest,
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managedObjectContext: context,
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sectionNameKeyPath: nil,
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cacheName: nil)
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} else {
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self.fetchedResults = NSFetchedResultsController()
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}
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super.init()
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self.tableView.dataSource = self
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self.tableView.reloadData()
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self.fetchedResults.delegate = self
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try? self.fetchedResults.performFetch()
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reload()
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}
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func reload() {
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let items: [Item] = fetchedResults.fetchedObjects ?? []
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DispatchQueue.global().async {
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let newSections = items.groupedByDate()
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let changeset = StagedChangeset(source: self.sections, target: newSections)
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DispatchQueue.main.async {
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self.tableView.reload(using: changeset, with: .fade) { newSects in
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self.sections = newSects
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}
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}
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}
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}
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func item(at indexPath: IndexPath) -> Item {
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sections[indexPath.section].elements[indexPath.row]
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}
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// MARK: - NSFetchedResultsControllerDelegate
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func controllerWillChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
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}
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func controllerDidChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
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}
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func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange sectionInfo: NSFetchedResultsSectionInfo, atSectionIndex sectionIndex: Int, for type: NSFetchedResultsChangeType) {
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}
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func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange anObject: Any, at indexPath: IndexPath?, for type: NSFetchedResultsChangeType, newIndexPath: IndexPath?) {
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reload()
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}
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// MARK: - UITableViewDataSource
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func numberOfSections(in tableView: UITableView) -> Int {
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return self.sections.count
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}
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func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
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return self.sections[section].elements.count
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}
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func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
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guard let cell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier, for: indexPath) as? Cell else {
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return UITableViewCell()
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}
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let item = self.sections[indexPath.section].elements[indexPath.row]
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cell.configure(with: item)
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return cell
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}
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func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
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return self.sections[section].header
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}
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}
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