Делегированная функция запускается, но вылетает как ее ноль, объекты в массиве элементов заполняются CoreData, этот var model: CoreDataModel = CoreDataModel(CoreDataController.shared) должен быть создан, а не как ожидалось в viewDidLoad, чтобы предотвратить нулевую ошибку для счетчика строк представления таблицы. (model.items.count)
При запуске массив элементов представляет собой полную базу данных Sqlite, при поиске ее подмножество таблицы и печать в консоль подтверждают, что массив изменен и имеет только подмножество альбомов.
BaseViewController
import UIKit
import CoreData
protocol UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath)
}
protocol MasterModel {
var client: LastFMClient { get }
func searchFeed(with userSearchTerm: String?, completion: @escaping (Bool) -> Void)
}
protocol DataReloadTableViewDelegate: class {
func reloadAlbumsTable()
}
class BaseViewController: UITableViewController, MasterModel {
let cellId = "sdlfjowieurewfn3489844224947824dslaksjfs;ad"
let logoContainer = UIView(frame: CGRect(x: 0, y: 0, width: 44, height: 44))
let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 44, height: 44))
let image = UIImage(named: "lastFMRedBlack")
let searchBar = UISearchBar()
let client = LastFMClient()
var model: CoreDataModel = CoreDataModel(CoreDataController.shared)
private var searchResults: Root?
override func viewDidLoad() {
super.viewDidLoad()
setupSearchController()
tableView.register(UITableViewCell.self, forCellReuseIdentifier: cellId)
tableView.register(SubtitleTableViewCell.self, forCellReuseIdentifier: cellId)
tableView.tableFooterView = UIView(frame: CGRect.zero)
tableView.separatorColor = UIColor(red: 72.5/255, green: 0/255, blue: 0/255, alpha: 1)
imageView.contentMode = .scaleAspectFit
imageView.image = image
logoContainer.addSubview(imageView)
navigationItem.titleView = logoContainer
print(FileManager.default.urls(for: .documentDirectory, in: .userDomainMask))
model.delegate = self
model.fetchAllAlbums()
}
// MARK - SearchBar
private func setupSearchController() {
searchBar.sizeToFit()
searchBar.placeholder = "Search for Album"
searchBar.delegate = self
showSearchBarButton(shouldShow: true)
}
func showSearchBarButton (shouldShow: Bool) {
if shouldShow {
navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .search, target: self, action: #selector(handleShowSearchBar))
} else {
searchBar.showsCancelButton = true
navigationItem.rightBarButtonItem = nil
}
}
func search(shouldShow: Bool) {
showSearchBarButton(shouldShow: !shouldShow)
navigationItem.titleView = shouldShow ? searchBar : logoContainer
}
@objc func handleShowSearchBar(){
search(shouldShow: true)
searchBar.becomeFirstResponder()
}
// MARK - API Request
func searchFeed(with userSearchTerm: String?, completion: @escaping (Bool) -> Void) {
// Use the API to get data
client.getFeed(from: LastFMRequest.albumSearch(userSearchTerm: userSearchTerm) ) { result in
switch result {
case .success(let data):
do {
let data = try DataParser.parse(data, type: RootNode.self)
self.searchResults = data.results
completion(true)
} catch {
print(error.localizedDescription)
completion(false)
}
case .failure(let error):
print(error.localizedDescription)
completion(false)
}
}
}
}
extension BaseViewController: UISearchBarDelegate {
func searchBarTextDidEndEditing(_ searchBar: UISearchBar) {
searchBar.text = nil
}
func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
search(shouldShow: false)
}
func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
guard let searchTextString = searchBar.text else { return }
searchFeed(with: searchTextString.replacingOccurrences(of: " ", with: "+").lowercased(), completion: {_ in
if self.searchResults!.albumMatches.album.count == 0 {
DispatchQueue.main.async {
let alertController = UIAlertController(title: "No Albums Found", message: "Try Another Keyword(s)", preferredStyle: .alert)
let OKAction = UIAlertAction(title: "OK", style: .default) { action in
print("Pressed OK")
}
alertController.addAction(OKAction)
self.present(alertController, animated: true, completion: nil)
}
} else {
let dataManager = DataManager(data: self.searchResults!)
do {
try dataManager.saveData()
} catch {
print(error)
}
}
})
search(shouldShow: false)
searchBar.resignFirstResponder()
}
}
class SubtitleTableViewCell: UITableViewCell {
override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
super.init(style: .subtitle, reuseIdentifier: reuseIdentifier)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
extension BaseViewController: UITableViewDataSource {
var numberOrSections: Int { return 1 }
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
guard section >= 0 && section < numberOrSections else { return 0 }
return model.items.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: cellId, for: indexPath)
let albumItem = model.items[indexPath.row]
cell.textLabel?.text = albumItem.value(forKeyPath: "name") as? String
cell.detailTextLabel?.text = albumItem.value(forKeyPath: "artist") as? String
cell.accessoryType = .disclosureIndicator
// Populate the cell from the object
return cell
}
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let vc = DetailViewController()
let albumItem = model.items[indexPath.row]
vc.iamgeURL = albumItem.value(forKeyPath: "imageUrl") as? String
vc.albumName = albumItem.value(forKeyPath: "name") as? String
navigationController?.pushViewController(vc, animated: true)
}
}
extension BaseViewController: DataReloadTableViewDelegate {
func reloadAlbumsTable(){
DispatchQueue.main.async {
print(self.model.items.count)
self.tableView.reloadData()
}
}
}
CoreDataModel
import Foundation import CoreData
, класс CoreDataModel {
weak var delegate: DataReloadTableViewDelegate?
let coreDataController: CoreDataController
var items:[Albums] = []
init(_ coreDataController: CoreDataController) {
self.coreDataController = coreDataController
self.coreDataController.mainContext.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy
}
internal func saveSearchAlbums(responseData: Root) throws {
let newSearch = Searches(context: coreDataController.mainContext)
newSearch.searchQuery = responseData.attr.forField
for (_, element) in responseData.albumMatches.album.enumerated() {
let newAlbum = Albums(context: coreDataController.mainContext)
let artistName = element.artist
let albumName = element.name
let imageUrlTwo = element.image[2].text
let imageUrlZero = element.image[0].text
let imageUrlOne = element.image[1].text
var imageUrl: String = ""
if !JustLetters.blank(text: imageUrlTwo) {
imageUrl = imageUrlTwo
}
if !JustLetters.blank(text: imageUrlZero) {
imageUrl = imageUrlZero
}
if !JustLetters.blank(text: imageUrlOne) {
imageUrl = imageUrlOne
}
if !JustLetters.blank(text: artistName) && !JustLetters.blank(text: albumName) && !JustLetters.blank(text: imageUrl) {
newAlbum.searches = newSearch
newAlbum.artist = artistName
newAlbum.name = albumName
newAlbum.imageUrl = imageUrl
newSearch.addToAlbums(newAlbum)
}
}
// Save context
coreDataController.saveContext()
fetchAlbumsByKeyword(searchTerm: responseData.attr.forField)
}
internal func fetchAlbumsByKeyword(searchTerm: String) {
// Create Fetch Request
let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "Albums")
// Add Sort Descriptor
let sortDescriptor = NSSortDescriptor(key: "name", ascending: true)
fetchRequest.sortDescriptors = [sortDescriptor]
// Add Predicate
let predicate = NSPredicate(format: "name CONTAINS[c] %@", searchTerm)
fetchRequest.predicate = predicate
do {
items = try coreDataController.mainContext.fetch(fetchRequest) as! [Albums]
} catch {
print(error)
}
delegate!.reloadAlbumsTable()
}
internal func fetchAllAlbums() {
// Create the FetchRequest for all searches
let allAlbums: NSFetchRequest = Albums.fetchRequest()
do {
items = try coreDataController.mainContext.fetch(allAlbums)
} catch {
print(error)
}
}
}