Добрый день.
В уроке 44-46 (Курс 2) Иван сделал Поиск ресторанов и прописал соответствующий код в файле EateriesTableViewController.swift .
При поиске ресторана заполняется массив var filteredResultArray: [Restaurant] = [] и заполняется в методе cellForRowAt indexPath. Все вроде хорошо работает, однако при попытке удалить выбранный в поиске ресторан возникает ошибка (удаление в методе editActionsForRowAt indexPath: ).
Как я понимаю проблема в том, что ресторан необходимо удалить не только в массиве var restaurants: [Restaurant] = [] , но и в CoreData. А при удаление ресторана выбранном в поиске (тоесть по сути из массива filteredResultArray ) indexPath выбранного ресторана отличается от indexPath -a в restaurants и в Restaurant хранящее в CoreData, в итоге
func controllerWillChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
tableView.beginUpdates()
}
func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange anObject: Any, at indexPath: IndexPath?, for type: NSFetchedResultsChangeType, newIndexPath: IndexPath?) {
switch type {
case .insert: guard let indexPath = newIndexPath else { break }
tableView.insertRows(at: [indexPath], with: .fade)
case .delete: guard let indexPath = indexPath else { break }
tableView.deleteRows(at: [indexPath], with: .fade)
case .update: guard let indexPath = indexPath else { break }
tableView.reloadRows(at: [indexPath], with: .fade)
default:
tableView.reloadData()
}
restaurants = controller.fetchedObjects as! [Restaurant]
}
func controllerDidChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
tableView.endUpdates()
}
отрабатывает не корректно.
Вопрос как все это подружить? Чтобы спокойно удалять выбранный ресторан в поиске из CoreData и чтобы корректно отрабатывали методы:?
controllerWillChangeContent
...
controllerDidChangeContent
Исходник EateriesTableViewController.swift:
//
// EateriesTableViewController.swift
// Eateries
//
// Created by Ivan Akulov on 29/09/2016.
// Copyright © 2016 Ivan Akulov. All rights reserved.
//
import UIKit
import CoreData
class EateriesTableViewController: UITableViewController, NSFetchedResultsControllerDelegate {
var fetchResultsController: NSFetchedResultsController<Restaurant>!
var searchController: UISearchController!
var filteredResultArray: [Restaurant] = []
var restaurants: [Restaurant] = []
// Restaurant(name: "Ogonёk Grill&Bar", type: "ресторан", location: "Уфа, бульвар Хадии Давлетшиной 21, вход со стороны улицы", image: "ogonek.jpg", isVisited: false),
// Restaurant(name: "Елу", type: "ресторан", location: "Уфа", image: "elu.jpg", isVisited: false),
// Restaurant(name: "Bonsai", type: "ресторан", location: "Уфа", image: "bonsai.jpg", isVisited: false),
// Restaurant(name: "Дастархан", type: "ресторан", location: "Уфа", image: "dastarhan.jpg", isVisited: false),
// Restaurant(name: "Индокитай", type: "ресторан", location: "Уфа", image: "indokitay.jpg", isVisited: false),
// Restaurant(name: "X.O", type: "ресторан-клуб", location: "Уфа", image: "x.o.jpg", isVisited: false),
// Restaurant(name: "Балкан Гриль", type: "ресторан", location: "Уфа", image: "balkan.jpg", isVisited: false),
// Restaurant(name: "Respublica", type: "ресторан", location: "Уфа", image: "respublika.jpg", isVisited: false),
// Restaurant(name: "Speak Easy", type: "ресторанный комплекс", location: "Уфа", image: "speakeasy.jpg", isVisited: false),
// Restaurant(name: "Morris Pub", type: "ресторан", location: "Уфа", image: "morris.jpg", isVisited: false),
// Restaurant(name: "Вкусные истории", type: "ресторан", location: "Уфа", image: "istorii.jpg", isVisited: false),
// Restaurant(name: "Классик", type: "ресторан", location: "Уфа", image: "klassik.jpg", isVisited: false),
// Restaurant(name: "Love&Life", type: "ресторан", location: "Уфа", image: "love.jpg", isVisited: false),
// Restaurant(name: "Шок", type: "ресторан", location: "Уфа", image: "shok.jpg", isVisited: false),
// Restaurant(name: "Бочка", type: "ресторан", location: "Уфа", image: "bochka.jpg", isVisited: false)]
@IBAction func close(segue: UIStoryboardSegue) {
}
override func viewWillAppear(_ animated: Bool) {
navigationController?.hidesBarsOnSwipe = true
}
func filterContentFor(searchText text: String) {
filteredResultArray = restaurants.filter { (restaurant) -> Bool in
return (restaurant.name?.lowercased().contains(text.lowercased()))!
}
}
override func viewDidLoad() {
super.viewDidLoad()
searchController = UISearchController(searchResultsController: nil)
searchController.searchResultsUpdater = self
searchController.dimsBackgroundDuringPresentation = false
tableView.tableHeaderView = searchController.searchBar
searchController.searchBar.delegate = self
definesPresentationContext = true
tableView.estimatedRowHeight = 85
tableView.rowHeight = UITableViewAutomaticDimension
self.navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: .plain, target: nil, action: nil)
// create fetch request with descriptor
let fetchRequest: NSFetchRequest<Restaurant> = Restaurant.fetchRequest()
let sortDescriptor = NSSortDescriptor(key: "name", ascending: true)
fetchRequest.sortDescriptors = [sortDescriptor]
// getting context
if let context = (UIApplication.shared.delegate as? AppDelegate)?.coreDataStack.persistentContainer.viewContext {
// creating fetch result controller
fetchResultsController = NSFetchedResultsController(fetchRequest: fetchRequest, managedObjectContext: context, sectionNameKeyPath: nil, cacheName: nil)
fetchResultsController.delegate = self
// trying to retrieve data
do {
try fetchResultsController.performFetch()
// save retrieved data into restaurants array
restaurants = fetchResultsController.fetchedObjects!
} catch let error as NSError {
print(error.localizedDescription)
}
}
}
// MARK: - Fetch results controller delegate
func controllerWillChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
tableView.beginUpdates()
}
func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange anObject: Any, at indexPath: IndexPath?, for type: NSFetchedResultsChangeType, newIndexPath: IndexPath?) {
switch type {
case .insert: guard let indexPath = newIndexPath else { break }
tableView.insertRows(at: [indexPath], with: .fade)
case .delete: guard let indexPath = indexPath else { break }
tableView.deleteRows(at: [indexPath], with: .fade)
case .update: guard let indexPath = indexPath else { break }
tableView.reloadRows(at: [indexPath], with: .fade)
default:
tableView.reloadData()
}
restaurants = controller.fetchedObjects as! [Restaurant]
}
func controllerDidChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
tableView.endUpdates()
}
// MARK: - Table view data source
override func numberOfSections(in tableView: UITableView) -> Int {
// #warning Incomplete implementation, return the number of sections
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
if searchController.isActive && searchController.searchBar.text != "" {
return filteredResultArray.count
}
return restaurants.count
}
func restaurantToDisplayAt(indexPath: IndexPath) -> Restaurant {
let restaurant: Restaurant
if searchController.isActive && searchController.searchBar.text != "" {
restaurant = filteredResultArray[indexPath.row]
} else {
restaurant = restaurants[indexPath.row]
}
return restaurant
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! EateriesTableViewCell
let restaurant = restaurantToDisplayAt(indexPath: indexPath)
cell.thumbnailImageView.image = UIImage(data: restaurant.image! as Data)
cell.thumbnailImageView.layer.cornerRadius = 32.5
cell.thumbnailImageView.clipsToBounds = true
cell.nameLabel.text = restaurant.name
cell.locationLabel.text = restaurant.location
cell.typeLabel.text = restaurant.type
cell.accessoryType = restaurant.isVisited ? .checkmark : .none
return cell
}
// override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
// // first alert controller with action sheet style
// let ac = UIAlertController(title: nil, message: "Выберите действие", preferredStyle: .actionSheet)
// // first alert controller action
// let call = UIAlertAction(title: "Позвонить: +7(347)111-111\(indexPath.row)", style: .default) {
// (action: UIAlertAction) -> Void in
// // second alert controller inside first action
// let alertC = UIAlertController(title: nil, message: "Вызов не может совершен", preferredStyle: .alert)
// // second alert controller action
// let ok = UIAlertAction(title: "OK", style: .default, handler: nil)
// // add action to second alert controller
// alertC.addAction(ok)
// // present second alert controler
// self.present(alertC, animated: true, completion: nil)
// }
// // second action
// let isVisitedTitle = self.restaurantIsVisited[indexPath.row] ? "Я не был здесь" : "Я был здесь"
// let isVisited = UIAlertAction(title: isVisitedTitle, style: .default) { (action) in
// let cell = tableView.cellForRow(at: indexPath)
//
// self.restaurantIsVisited[indexPath.row] = !self.restaurantIsVisited[indexPath.row]
// cell?.accessoryType = self.restaurantIsVisited[indexPath.row] ? .checkmark : .none
// }
// // third action
// let cancel = UIAlertAction(title: "Отмена", style: .cancel, handler: nil)
// // add all actions to first alert controller
// ac.addAction(call)
// ac.addAction(isVisited)
// ac.addAction(cancel)
// //present first alert controller
// present(ac, animated: true, completion: nil)
//
// tableView.deselectRow(at: indexPath, animated: true)
// }
// override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
//
// if editingStyle == .delete {
// self.restaurantImages.remove(at: indexPath.row)
// self.restaurantNames.remove(at: indexPath.row)
// self.restaurantIsVisited.remove(at: indexPath.row)
// }
//// tableView.reloadData()
// tableView.deleteRows(at: [indexPath], with: .fade)
// }
override func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]? {
let share = UITableViewRowAction(style: .default, title: "Поделиться") { (action, indexPath) in
let defaultText = "Я сейчас в " + self.restaurants[indexPath.row].name!
if let image = UIImage(data: self.restaurants[indexPath.row].image! as Data) {
let activityController = UIActivityViewController(activityItems: [defaultText, image], applicationActivities: nil)
self.present(activityController, animated: true, completion: nil)
}
}
let delete = UITableViewRowAction(style: .default, title: "Удалить") { (action, indexPath) in
self.restaurants.remove(at: indexPath.row)
tableView.deleteRows(at: [indexPath], with: .fade)
if let context = (UIApplication.shared.delegate as? AppDelegate)?.coreDataStack.persistentContainer.viewContext {
let objectToDelete = self.fetchResultsController.object(at: indexPath)
context.delete(objectToDelete)
do {
try context.save()
} catch {
print(error.localizedDescription)
}
}
}
share.backgroundColor = #colorLiteral(red: 0.2392156869, green: 0.6745098233, blue: 0.9686274529, alpha: 1)
delete.backgroundColor = #colorLiteral(red: 0.9254902005, green: 0.2352941185, blue: 0.1019607857, alpha: 1)
return [delete, share]
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "detailSegue" {
if let indexPath = tableView.indexPathForSelectedRow {
let dvc = segue.destination as! EateryDetailViewController
dvc.restaurant = restaurantToDisplayAt(indexPath: indexPath)
}
}
}
}
extension EateriesTableViewController: UISearchResultsUpdating {
func updateSearchResults(for searchController: UISearchController) {
filterContentFor(searchText: searchController.searchBar.text!)
tableView.reloadData()
}
}
extension EateriesTableViewController: UISearchBarDelegate {
func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {
if searchBar.text == "" {
navigationController?.hidesBarsOnSwipe = false
}
}
func searchBarTextDidEndEditing(_ searchBar: UISearchBar) {
navigationController?.hidesBarsOnSwipe = true
}
}