Usecase,Entities,FeedListRepository,FirebaseRemoteDataSource를 생성했습니다.

HomeCafeRecipes/HomeCafeRecipes/Data/FeedListRepository.swift

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+//
+//  FeedListRepository.swift
+//  HomeCafeRecipes
+//
+//  Created by 김건호 on 5/30/24.
+//
+
+import Foundation
+
+protocol FeedListRepository {
+    func fetchFeedItems(completion: @escaping (Result<[FeedItem], Error>) -> Void)
+    func searchFeedItems(title: String, completion: @escaping (Result<[FeedItem], Error>) -> Void)
+}
+class FeedListRepositoryImpl: FeedListRepository {
+    private let remoteDataSource: FirebaseRemoteDataSource
+
+    init(remoteDataSource: FirebaseRemoteDataSource) {
+        self.remoteDataSource = remoteDataSource
+    }
+
+    func fetchFeedItems(completion: @escaping (Result<[FeedItem], Error>) -> Void) {
+        remoteDataSource.fetchFeedItems(completion: completion)
+    }
+
+    func searchFeedItems(title : String, completion: @escaping (Result<[FeedItem], Error>) -> Void){
+        remoteDataSource.searchFeedItems(title: title, completion: completion)
+    }
+
+
+}

HomeCafeRecipes/HomeCafeRecipes/Data/FirebaseRemoteDataSource.swift

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+//
+//  FirebaseRemoteDataSource.swift
+//  HomeCafeRecipes
+//
+//  Created by 김건호 on 5/30/24.
+//
+
+import FirebaseFirestore
+
+class FirebaseRemoteDataSource {
+    private let db = Firestore.firestore()
+
+    func fetchFeedItems(completion: @escaping (Result<[FeedItem], Error>) -> Void) {
+        db.collection("feedItems").getDocuments { (querySnapshot, error) in
+            if let error = error {
+                completion(.failure(error))
+                return
+            }
+            guard let documents = querySnapshot?.documents else {
+                completion(.success([]))
+                return
+            }
+            let feedItems = documents.compactMap { doc -> FeedItem? in
+                let data = doc.data()
+                guard
+                    let title = data["title"] as? String,
+                    let imageURL = data["imageURL"] as? [String] else {
+                    return nil
+                }
+                return FeedItem(id: doc.documentID, title: title, imageURL: imageURL)
+            }
+            completion(.success(feedItems))
+        }
+    }
+
+    func searchFeedItems(title: String, completion: @escaping (Result<[FeedItem], Error>) -> Void) {
+        db.collection("feedItems")
+            .whereField("title", isGreaterThanOrEqualTo: title)
+            .whereField("title", isLessThanOrEqualTo: "\(title)\u{f8ff}")
+            .getDocuments { (querySnapshot, error) in
+                if let error = error {
+                    completion(.failure(error))
+                    return
+                }
+                guard let documents = querySnapshot?.documents else {
+                    completion(.success([]))
+                    return
+                }
+                let feedItems = documents.compactMap { doc -> FeedItem? in
+                    let data = doc.data()
+                    guard
+                        let title = data["title"] as? String,
+                        let imageURL = data["imageURL"] as? [String] else {
+                        return nil
+                    }
+                    return FeedItem(id: doc.documentID, title: title, imageURL: imageURL)
+                }
+                completion(.success(feedItems))
+            }
+    }
+
+}

HomeCafeRecipes/HomeCafeRecipes/Domain/Entities/FeedItem.swift

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+//
+//  FeedModel.swift
+//  HomeCafeRecipes
+//
+//  Created by 김건호 on 5/16/24.
+//
+
+struct FeedItem {
+    let id: String
+    let title : String
+    let imageURL : [String]
+}

HomeCafeRecipes/HomeCafeRecipes/Domain/UseCase/FetchFeedListUsecase.swift

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+//
+//  fetchFeedListUsecase.swift
+//  HomeCafeRecipes
+//
+//  Created by 김건호 on 5/30/24.
+//
+
+
+protocol FetchFeedListUseCase {
+    func execute(completion: @escaping (Result<[FeedItem], Error>) -> Void)
+}
+
+class DefaultFetchFeedListUseCase: FetchFeedListUseCase {
+    private let repository: FeedListRepository
+
+    init(repository: FeedListRepository) {
+        self.repository = repository
+    }
+
+    func execute(completion: @escaping (Result<[FeedItem], Error>) -> Void) {
+        repository.fetchFeedItems { result in
+            completion(result)
+        }
+    }
+}

HomeCafeRecipes/HomeCafeRecipes/Domain/UseCase/SearchFeedListUsecase.swift

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+//
+//  SearchFeedListusecase.swift
+//  HomeCafeRecipes
+//
+//  Created by 김건호 on 5/30/24.
+//
+
+
+protocol SearchFeedListUseCase {
+    func execute(title: String, completion: @escaping (Result<[FeedItem], Error>) -> Void)
+}
+
+class DefaultSearchFeedListUseCase: SearchFeedListUseCase {
+    private let repository: FeedListRepository
+
+    init(repository: FeedListRepository) {
+        self.repository = repository
+    }
+
+    func execute(title: String, completion: @escaping (Result<[FeedItem], Error>) -> Void) {
+        repository.searchFeedItems(title: title) { result in
+            completion(result)
+        }
+    }
+}

HomeCafeRecipes/HomeCafeRecipes/Presentation/FeedList/View/FeedListViewController.swift

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+//
+//  FeedListViewcontroller.swift
+//  HomeCafeRecipes
+//
+//  Created by 김건호 on 5/30/24.
+//
+
+import Foundation