NETFLIX CLONE 13편 (코어 데이터)

✅ 코어 데이터 적용 

• 코어 데이터 엔티티 생성 
• DataPersistenceManager 클래스 생성 
• downloadTitleWith 함수 구현 
• CollectionViewTableViewCell 이라는 파일 안에서 downloadTitleAt 이라는 함수구현
• 해당 함수는 indexPath를 통해 전달 받은 데이터를 DataPersistenceManager에 전달 
• DownloadsViewController 안에 테이블뷰 생성 
• DataPersistenceManager 내에 코어데이터로부터 데이터를 가져오는 fetchingTitlesFromDataBase() 라는 메서드 생성
• DowloadsViewController 클래스 내에 코어 데이터로부터 데이터를 가져오는 fetchLocalStorageForDownload() 라는 메서드 생성 
• DataPersistenceManager 클래스 내에 코어데이터의 데이터를 삭제하는 deleteTitleWith () 메서드 생성
• ⭐ 중요한 점이 코어 데이터에서 데이터 삭제가 먼저 ➡ 임시 배열에서 삭제 ➡ 테이블뷰에서 삭제 ⭐
• DownloadsViewController 클래스에서 extension 부분에서 editingStyle 이라는 파라미터를 갖는 tableView 함수에서 삭제 구현
• Downloads 라는 알림을 노티피케이션이라는 기능 사용
• 먼저 데이터 알림을 보내주는 역할을 CollectionViewTableViewCell 에서 downloadTitleAt 메서드에서 구현
• 데이터 알림을 수신하기 위한 역할을 DownloadsViewController 클래스에서 NotificationCenter 라는 함수로 구현

 

 

 

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✅ 코어 데이터 적용 

• CollectionViewTableViewCell 파일 내에 extension 부분에 작성 

func collectionView(_ collectionView: UICollectionView, contextMenuConfigurationForItemsAt indexPaths: [IndexPath], point: CGPoint) -> UIContextMenuConfiguration? {
        
        let config = UIContextMenuConfiguration(
            identifier: nil,
            previewProvider: nil) { _ in
                let downloadAction = UIAction(title: "Download", subtitle: nil, image: nil, identifier: nil, discoverabilityTitle: nil, state: .off) { _ in
                    print("Download Tapped")
                }
                
                return UIMenu(title: "", image: nil, identifier: nil, options: .displayInline, children: [downloadAction])
            }
        
        return config
    }

 

 

 

• 다운로드 함수 설정 

    // 다운로드 함수
    private func downloadTitleAt(indexPath: IndexPath) {
        print("Downloading \(String(describing: titles[indexPath.row].original_title))")
    }

 

• CollectionViewTableViewCell 안에 extension 부분에 작성한 부분 수정

   func collectionView(_ collectionView: UICollectionView, contextMenuConfigurationForItemsAt indexPaths: [IndexPath], point: CGPoint) -> UIContextMenuConfiguration? {
        
        let config = UIContextMenuConfiguration(
            identifier: nil,
            previewProvider: nil) { _ in
                let downloadAction = UIAction(title: "Download", subtitle: nil, image: nil, identifier: nil, discoverabilityTitle: nil, state: .off) { _ in
                    
                    var indexPath = indexPaths[0]
                    self.downloadTitleAt(indexPath: indexPath)
                }
                
                return UIMenu(title: "", image: nil, identifier: nil, options: .displayInline, children: [downloadAction])
            }
        
        return config
    }

 

 

 

 

• 코어 데이터 모델 생성 

]

 

• 코어 데이터를 관리하기 위해 DataPersistenceManager 파일을 생성 

import Foundation
import UIKit
import CoreData


class DataPersistenceManager {
    
    enum DatabaseError: Error {
        case failedToSaveData
    }
    
    
    static let shared = DataPersistenceManager()
    
    
    func downloadTitleWith(model: Title, completion: @escaping (Result<Void, Error>) -> Void) {
        
        guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else { return }
        
        let context = appDelegate.persistentContainer.viewContext
        
        let item = TitleItem(context: context)
        
        item.original_title = model.original_title
        item.id = Int64(model.id)
        item.original_name = model.original_name
        item.overview = model.overview
        item.media_type = model.media_type
        item.poster_path = model.poster_path
        item.release_date = model.release_date
        item.vote_count = Int64(model.vote_count)
        item.vote_average = model.vote_average
        
        do {
            try context.save()
            completion(.success(()))
        } catch {
            completion(.failure(DatabaseError.failedToSaveData))
        }
        
    }
}

 

• collectionViewTableViewCell 파일 내 downloadTitleAt 메서드 생성

    // 다운로드 함수
    private func downloadTitleAt(indexPath: IndexPath) {
        
        DataPersistenceManager.shared.downloadTitleWith(model: titles[indexPath.row]) { result in
            switch result {
            case.success():
                print("Download to Database")
            case.failure(let error):
                print(error.localizedDescription)
            }
        }
    }

 

• 영화를 눌러서 다운로드 창이 뜬걸 누르면 콘솔창에 나오는 출력을 확인

 

 

• DownloadsViewController 파일 생성

import UIKit

class DownloadsViewController: UIViewController {
    
    
    private var titles: [TitleItem] = [TitleItem]()
    
    
    private let downloadedTable: UITableView = {
        let table = UITableView()
        table.register(TitleTableViewCell.self, forCellReuseIdentifier: TitleTableViewCell.identifier)
        return table
    }()

    override func viewDidLoad() {
        super.viewDidLoad()

        view.backgroundColor = .systemBackground
        
        
        title = "Downloads"
        navigationController?.navigationBar.prefersLargeTitles = true
        navigationController?.navigationItem.largeTitleDisplayMode = .always
        
        
        downloadedTable.delegate = self
        downloadedTable.dataSource = self
    }
}


extension DownloadsViewController: UITableViewDelegate, UITableViewDataSource {
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return titles.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        guard let cell = tableView.dequeueReusableCell(withIdentifier: TitleTableViewCell.identifier, for: indexPath) as? TitleTableViewCell else { return UITableViewCell() }
        
        let title = titles[indexPath.row]
        cell.configure(with: TitleViewModel(titleName: (title.original_name ?? title.original_title) ?? "Unknown title name", posterURL: title.poster_path ?? ""))
        
        return cell
    }
    
    func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
        return 140
    }
    
}

• DataPersistenceManager 클래스에서 fetching~ 메서드 생성

import Foundation
import UIKit
import CoreData


class DataPersistenceManager {
    
    enum DatabaseError: Error {
        case failedToSaveData
        case failedToFetchData
    }
    
    
    static let shared = DataPersistenceManager()
    
    
    func downloadTitleWith(model: Title, completion: @escaping (Result<Void, Error>) -> Void) {
        
        guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else { return }
        
        let context = appDelegate.persistentContainer.viewContext
        
        let item = TitleItem(context: context)
        
        item.original_title = model.original_title
        item.id = Int64(model.id)
        item.original_name = model.original_name
        item.overview = model.overview
        item.media_type = model.media_type
        item.poster_path = model.poster_path
        item.release_date = model.release_date
        item.vote_count = Int64(model.vote_count)
        item.vote_average = model.vote_average
        
        do {
            try context.save()
            completion(.success(()))
        } catch {
            completion(.failure(DatabaseError.failedToSaveData))
        }
    }
    
    
    func fetchingTitlesFromDataBase(completion: @escaping (Result<[TitleItem], Error>) -> Void) {
        
        guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else { return }
        
        let context = appDelegate.persistentContainer.viewContext
        
        let request: NSFetchRequest<TitleItem>
        
        request = TitleItem.fetchRequest()
        
        
        do {
            
            let titles = try context.fetch(request)
            completion(.success(titles))
            
        } catch {
            completion(.failure(DatabaseError.failedToFetchData))
        }
    }
}

 

 

• DownloadsViewcontroller 에 돌아가서 fetchLocalStorageForDownload() 생성

import UIKit

class DownloadsViewController: UIViewController {
    
    
    private var titles: [TitleItem] = [TitleItem]()
    
    
    private let downloadedTable: UITableView = {
        let table = UITableView()
        table.register(TitleTableViewCell.self, forCellReuseIdentifier: TitleTableViewCell.identifier)
        return table
    }()

    override func viewDidLoad() {
        super.viewDidLoad()

        view.backgroundColor = .systemBackground
        
        
        title = "Downloads"
        navigationController?.navigationBar.prefersLargeTitles = true
        navigationController?.navigationItem.largeTitleDisplayMode = .always
        
        view.addSubview(downloadedTable)
        
        downloadedTable.delegate = self
        downloadedTable.dataSource = self
        
        fetchLocalStorageForDownload()
    }
    
    
    
    // 다운로드한 영화 보여주기
    private func fetchLocalStorageForDownload() {
        
        DataPersistenceManager.shared.fetchingTitlesFromDataBase { [weak self] result in
            switch result {
            case .success(let titles):
                self?.titles = titles
                DispatchQueue.main.async {
                    self?.downloadedTable.reloadData()
                }
                
            case.failure(let error):
                print(error.localizedDescription)
            }
        }
    }
    
    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        
        downloadedTable.frame = view.bounds
    }
}


extension DownloadsViewController: UITableViewDelegate, UITableViewDataSource {
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return titles.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        guard let cell = tableView.dequeueReusableCell(withIdentifier: TitleTableViewCell.identifier, for: indexPath) as? TitleTableViewCell else { return UITableViewCell() }
        
        let title = titles[indexPath.row]
        cell.configure(with: TitleViewModel(titleName: (title.original_name ?? title.original_title) ?? "Unknown title name", posterURL: title.poster_path ?? ""))
        
        return cell
    }
    
    func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
        return 140
    }
    
}

 

 

• DataPersistenceManager 내에 delete 기능 추가 

import Foundation
import UIKit
import CoreData


class DataPersistenceManager {
    
    enum DatabaseError: Error {
        case failedToSaveData
        case failedToFetchData
        case failedToDeleteData
    }
    
    
    static let shared = DataPersistenceManager()
    
    
    func downloadTitleWith(model: Title, completion: @escaping (Result<Void, Error>) -> Void) {
        
        guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else { return }
        
        let context = appDelegate.persistentContainer.viewContext
        
        let item = TitleItem(context: context)
        
        item.original_title = model.original_title
        item.id = Int64(model.id)
        item.original_name = model.original_name
        item.overview = model.overview
        item.media_type = model.media_type
        item.poster_path = model.poster_path
        item.release_date = model.release_date
        item.vote_count = Int64(model.vote_count)
        item.vote_average = model.vote_average
        
        do {
            try context.save()
            completion(.success(()))
        } catch {
            completion(.failure(DatabaseError.failedToSaveData))
        }
    }
    
    
    func fetchingTitlesFromDataBase(completion: @escaping (Result<[TitleItem], Error>) -> Void) {
        
        guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else { return }
        
        let context = appDelegate.persistentContainer.viewContext
        
        let request: NSFetchRequest<TitleItem>
        
        request = TitleItem.fetchRequest()
        
        
        do {
            
            let titles = try context.fetch(request)
            completion(.success(titles))
            
        } catch {
            completion(.failure(DatabaseError.failedToFetchData))
        }
    }
    
    
    func deleteTitleWith(model: TitleItem, completion: @escaping (Result<Void, Error>) -> Void) {
        
        guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else { return }
        
        let context = appDelegate.persistentContainer.viewContext
        
        context.delete(model)
        
        do {
            
            try context.save()
            completion(.success(()))
            
        } catch {
            
            completion(.failure(DatabaseError.failedToDeleteData))
        }
    }
}

 

• DownloadViewController 내에 아래 코드 추가

extension DownloadsViewController: UITableViewDelegate, UITableViewDataSource {
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return titles.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        guard let cell = tableView.dequeueReusableCell(withIdentifier: TitleTableViewCell.identifier, for: indexPath) as? TitleTableViewCell else { return UITableViewCell() }
        
        let title = titles[indexPath.row]
        cell.configure(with: TitleViewModel(titleName: (title.original_name ?? title.original_title) ?? "Unknown title name", posterURL: title.poster_path ?? ""))
        
        return cell
    }
    
    func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
        return 140
    }
    
    
    // 삭제 기능 구현 
    
    func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
        switch editingStyle {
        case.delete:
            DataPersistenceManager.shared.deleteTitleWith(model: titles[indexPath.row]) { [weak self] result in
                switch result {
                case .success():
                    print("Deleted from the database")
                case .failure(let error):
                    print(error.localizedDescription)
                }
                self?.titles.remove(at: indexPath.row)
                tableView.deleteRows(at: [indexPath], with: .fade)
            }
            
        default:
            break;
        }
    }
}

 

 

• CollectionViewTableViewCell 내에 알림 설정 

    // 다운로드 함수
    private func downloadTitleAt(indexPath: IndexPath) {
        
        DataPersistenceManager.shared.downloadTitleWith(model: titles[indexPath.row]) { result in
            switch result {
            case.success():
                NotificationCenter.default.post(name: NSNotification.Name("downloaded"), object: nil)
            case.failure(let error):
                print(error.localizedDescription)
            }
        }
    }

 

 

• 위에서 다운로드하면 알림이 가게 하면 DownloadsViewCotroller 에서 받게 설정 

class DownloadsViewController: UIViewController {
    
    
    private var titles: [TitleItem] = [TitleItem]()
    
    
    private let downloadedTable: UITableView = {
        let table = UITableView()
        table.register(TitleTableViewCell.self, forCellReuseIdentifier: TitleTableViewCell.identifier)
        return table
    }()

    override func viewDidLoad() {
        super.viewDidLoad()

        view.backgroundColor = .systemBackground
        
        
        title = "Downloads"
        navigationController?.navigationBar.prefersLargeTitles = true
        navigationController?.navigationItem.largeTitleDisplayMode = .always
        
        view.addSubview(downloadedTable)
        
        downloadedTable.delegate = self
        downloadedTable.dataSource = self
        
        fetchLocalStorageForDownload()
        NotificationCenter.default.addObserver(forName: NSNotification.Name("downloaded"), object: nil, queue: nil) { _ in
            self.fetchLocalStorageForDownload()
        }
    }

 

 

 

 

• DownloadViewController 내에 상세 페이지로 이동하는 함수 추가 

   // 데이터를 누르면 상세 페이지로 옮겨가기
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        tableView.deselectRow(at: indexPath, animated: true)
        
        let title = titles[indexPath.row]
        
        guard let titleName = title.original_title ?? title.original_name else { return }
        
        APICaller.shared.getMovie(with: titleName) { [weak self] result in
            switch result {
            case .success(let videoElement):
                DispatchQueue.main.async {
                    let vc = TitlePreviewViewController()
                    vc.configure(with: TitlePreviewViewModel(title: titleName, youtubeView: videoElement, titleOverview: title.overview ?? ""))
                    self?.navigationController?.pushViewController(vc, animated: true)
                }
                
            case.failure(let error):
                print(error.localizedDescription)
            }
        }
    }

 

https://youtu.be/-swDydWTjEc?si=xpynvOoVH0n7d5mF