홈화면 책커버 Drag & Drop 구현

MemorialHouse/MHData/MHData/DTO/BookCoverDTO.swift

@@ -3,6 +3,7 @@ import MHDomain
 
 public struct BookCoverDTO {
     let id: UUID
+    let order: Int
     let title: String
     let imageURL: String?
     let color: String
@@ -11,13 +12,15 @@ public struct BookCoverDTO {
 
     public init(
         id: UUID,
+        order: Int,
         title: String,
         imageURL: String?,
         color: String,
         category: String?,
         favorite: Bool
     ) {
         self.id = id
+        self.order = order
         self.title = title
         self.imageURL = imageURL
         self.color = color
@@ -30,6 +33,7 @@ public struct BookCoverDTO {
 
         return BookCover(
             id: self.id,
+            order: self.order,
             title: self.title,
             imageURL: self.imageURL,
             color: color,

MemorialHouse/MHData/MHData/LocalStorage/CoreData/CoreDataBookCoverStorage.swift

@@ -80,6 +80,7 @@ extension CoreDataBookCoverStorage {
 
         return BookCoverDTO(
             id: id,
+            order: Int(bookCover.order),
             title: title,
             imageURL: bookCover.imageURL,
             color: color,

MemorialHouse/MHData/MHData/LocalStorage/CoreData/MemorialHouseModel.xcdatamodeld/MemorialHouseModel.xcdatamodel/contents

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
-<model type="com.apple.IDECoreDataModeler.DataModel" documentVersion="1.0" lastSavedToolsVersion="23507" systemVersion="24B2082" minimumToolsVersion="Automatic" sourceLanguage="Swift" usedWithSwiftData="YES" userDefinedModelVersionIdentifier="">
+<model type="com.apple.IDECoreDataModeler.DataModel" documentVersion="1.0" lastSavedToolsVersion="23507" systemVersion="24B2091" minimumToolsVersion="Automatic" sourceLanguage="Swift" usedWithSwiftData="YES" userDefinedModelVersionIdentifier="">
     <entity name="BookCategoryEntity" representedClassName="BookCategoryEntity" syncable="YES" codeGenerationType="class">
         <attribute name="name" optional="YES" attributeType="String"/>
         <attribute name="order" optional="YES" attributeType="Integer 64" defaultValueString="0" usesScalarValueType="YES"/>
@@ -10,6 +10,7 @@
         <attribute name="favorite" optional="YES" attributeType="Boolean" usesScalarValueType="YES"/>
         <attribute name="id" optional="YES" attributeType="UUID" usesScalarValueType="NO"/>
         <attribute name="imageURL" optional="YES" attributeType="String"/>
+        <attribute name="order" optional="YES" attributeType="Integer 64" defaultValueString="0" usesScalarValueType="YES"/>
         <attribute name="title" optional="YES" attributeType="String"/>
     </entity>
     <entity name="BookEntity" representedClassName="BookEntity" syncable="YES" codeGenerationType="class">

MemorialHouse/MHData/MHData/Repository/LocalBookCoverRepository.swift

@@ -12,6 +12,7 @@ public struct LocalBookCoverRepository: BookCoverRepository {
     public func create(bookCover: BookCover) async {
         let bookCoverDTO = BookCoverDTO(
             id: bookCover.id,
+            order: bookCover.order,
             title: bookCover.title,
             imageURL: bookCover.imageURL,
             color: bookCover.color.rawValue,
@@ -51,6 +52,7 @@ public struct LocalBookCoverRepository: BookCoverRepository {
     public func update(id: UUID, bookCover: BookCover) async {
         let bookCoverDTO = BookCoverDTO(
             id: bookCover.id,
+            order: bookCover.order,
             title: bookCover.title,
             imageURL: bookCover.imageURL,
             color: bookCover.color.rawValue,

MemorialHouse/MHData/MHDataTests/CoreDataBookCoverStorageTests.swift

@@ -10,20 +10,23 @@ struct CoreDataBookCoverStorageTests {
     private static let bookCovers = [
         BookCoverDTO(
             id: UUID(),
+            order: 1,
             title: "test1",
             imageURL: nil,
             color: "pink",
             category: nil,
             favorite: true),
         BookCoverDTO(
             id: UUID(),
+            order: 2,
             title: "test2",
             imageURL: nil,
             color: "blue",
             category: nil,
             favorite: false),
         BookCoverDTO(
             id: UUID(),
+            order: 3,
             title: "test3",
             imageURL: nil,
             color: "beige",
@@ -41,6 +44,7 @@ struct CoreDataBookCoverStorageTests {
         // Arrange
         let newBookCover = BookCoverDTO(
             id: UUID(),
+            order: 4,
             title: "test4",
             imageURL: nil,
             color: "green",
@@ -83,6 +87,7 @@ struct CoreDataBookCoverStorageTests {
         let oldBookCover = CoreDataBookCoverStorageTests.bookCovers[0]
         let newBookCover = BookCoverDTO(
             id: oldBookCover.id,
+            order: 4,
             title: "test4",
             imageURL: nil,
             color: "green",

MemorialHouse/MHData/MHDataTests/MHFileManagerTests.swift

@@ -7,7 +7,7 @@
     private let testDirectory = "TestDirectory"
     private let newTestDirectory = "NewTestDirectory"
     private let testFileName = "testFile.txt"
     private let testFileData = "Hello, File!".data(using: .utf8)!
 
     init() {
         self.fileManager = MHFileManager(directoryType: .documentDirectory)
@@ -30,6 +30,7 @@
             #expect(false, "\(#function) 실패함: \(error)")
         }
     }
+
     @Test func test파일읽기_성공() async {
         // Arrange
         let path = testDirectory
@@ -46,6 +47,7 @@
             #expect(false, "\(#function) 실패함: \(error)")
         }
     }
+
     @Test func test없는_파일읽기_실패() async {
         // Arrange
         let path = testDirectory
@@ -61,6 +63,7 @@
             #expect(error == .fileNotExists)
         }
     }
+
     @Test func test파일삭제_성공() async {
         // Arrange
         let path = testDirectory
@@ -79,6 +82,7 @@
             #expect(false, "\(#function) 실패함: \(error)")
         }
     }
+
     @Test func test없는_파일삭제_실패() async {
         // Arrange
         let path = testDirectory
@@ -94,6 +98,7 @@
             #expect(error == .fileDeletionFailure)
         }
     }
+
     @Test func test파일이동_성공() async {
         // Arrange
         let path = testDirectory
@@ -114,7 +119,6 @@
         }
     }
 
-
     deinit {
         // 테스트 디렉토리와 관련된 파일 정리
         let directoryURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!

MemorialHouse/MHDomain/MHDomain/Entity/BookCover.swift

@@ -2,6 +2,7 @@ import MHFoundation
 
 public struct BookCover: Identifiable, Equatable, Sendable {
     public let id: UUID
+    public let order: Int
     public let title: String
     public let imageURL: String?
     public let color: BookColor
@@ -10,13 +11,15 @@ public struct BookCover: Identifiable, Equatable, Sendable {
 
     public init(
         id: UUID = .init(),
+        order: Int,
         title: String,
         imageURL: String?,
         color: BookColor,
         category: String?,
         favorite: Bool = false
     ) {
         self.id = id
+        self.order = order
         self.title = title
         self.imageURL = imageURL
         self.color = color

MemorialHouse/MHPresentation/MHPresentation/Source/Home/HomeViewController.swift

@@ -79,6 +79,8 @@ public final class HomeViewController: UIViewController {
         view.backgroundColor = .baseBackground
         collectionView.delegate = self
         collectionView.dataSource = self
+        collectionView.dragDelegate = self
+        collectionView.dropDelegate = self
         collectionView.register(
             BookCollectionViewCell.self,
             forCellWithReuseIdentifier: BookCollectionViewCell.identifier
@@ -95,7 +97,7 @@ public final class HomeViewController: UIViewController {
             switch event {
             case .fetchedMemorialHouseAndCategory:
                 self.updateMemorialHouse()
-            case .filteredBooks:
+            case .filteredBooks, .dragAndDropFinished:
                 self.collectionView.reloadData()
             case .fetchedFailure(let errorMessage):
                 self.handleError(with: errorMessage)
@@ -285,8 +287,80 @@ extension HomeViewController: UICollectionViewDataSource {
     }
 }
 
+// MARK: - UICollectionViewDragDelegate
+extension HomeViewController: UICollectionViewDragDelegate {
+    public func collectionView(
+        _ collectionView: UICollectionView,
+        itemsForBeginning session: any UIDragSession,
+        at indexPath: IndexPath
+    ) -> [UIDragItem] {
+        let dragItem = UIDragItem(itemProvider: NSItemProvider())
+        return [dragItem]
+    }
+}
+
+// MARK: - UICollectionViewDropDelegate
+extension HomeViewController: UICollectionViewDropDelegate {
+    public func collectionView(
+        _ collectionView: UICollectionView,
+        dropSessionDidUpdate session: UIDropSession,
+        withDestinationIndexPath destinationIndexPath: IndexPath?
+    ) -> UICollectionViewDropProposal {
+        guard collectionView.hasActiveDrag else { return UICollectionViewDropProposal(operation: .forbidden) }
+        return UICollectionViewDropProposal(operation: .move, intent: .insertAtDestinationIndexPath)
+    }
+
+    public func collectionView(
+        _ collectionView: UICollectionView,
+        performDropWith coordinator: UICollectionViewDropCoordinator
+    ) {
+        var destinationIndexPath: IndexPath
+        if let indexPath = coordinator.destinationIndexPath {
+            destinationIndexPath = indexPath
+        } else {
+            let row = collectionView.numberOfItems(inSection: 0)
+            destinationIndexPath = IndexPath(item: row - 1, section: 0)
+        }
+
+        moveItems(
+            coordinator: coordinator,
+            destinationIndexPath: destinationIndexPath,
+            collectionView: collectionView
+        )
+    }
+
+    private func moveItems(
+        coordinator: UICollectionViewDropCoordinator,
+        destinationIndexPath: IndexPath,
+        collectionView: UICollectionView
+    ) {
+        guard
+            coordinator.proposal.operation == .move,
+            let item = coordinator.items.first,
+            let sourceIndexPath = item.sourceIndexPath
+        else { return }
+
+        collectionView.performBatchUpdates { [weak self] in
+            guard let self else { return }
+            input.send(
+                .dragAndDropBookCover(
+                    currentIndex: sourceIndexPath.item,
+                    destinationIndex: destinationIndexPath.item
+                )
+            )
+
+            collectionView.deleteItems(at: [sourceIndexPath])
+            collectionView.insertItems(at: [destinationIndexPath])
+        }
+    }
+}
+
+// MARK: - BookCategoryViewControllerDelegate
 extension HomeViewController: BookCategoryViewControllerDelegate {
-    func categoryViewController(_ categoryViewController: BookCategoryViewController, didSelectCategory category: String) {
+    func categoryViewController(
+        _ categoryViewController: BookCategoryViewController,
+        didSelectCategory category: String
+    ) {
         currentCategory = category
         input.send(.selectedCategory(category: category))
     }

MemorialHouse/MHPresentation/MHPresentation/Source/Home/HomeViewModel.swift

@@ -6,12 +6,14 @@ public final class HomeViewModel: ViewModelType {
     public enum Input {
         case viewDidLoad
         case selectedCategory(category: String)
+        case dragAndDropBookCover(currentIndex: Int, destinationIndex: Int)
     }
 
     public enum Output {
         case fetchedMemorialHouseAndCategory
         case filteredBooks
         case fetchedFailure(String)
+        case dragAndDropFinished
     }
 
     private let output = PassthroughSubject<Output, Never>()
@@ -41,6 +43,8 @@ public final class HomeViewModel: ViewModelType {
                 }
             case .selectedCategory(let category):
                 self?.filterBooks(by: category)
+            case .dragAndDropBookCover(let currentIndex, let destinationIndex):
+                self?.dragAndDropBookCover(from: currentIndex, to: destinationIndex)
             }
         }.store(in: &cancellables)
 
@@ -66,4 +70,14 @@ public final class HomeViewModel: ViewModelType {
 
         output.send(.filteredBooks)
     }
+
+    private func dragAndDropBookCover(from currentIndex: Int, to destinationIndex: Int) {
+        let currentBookCover = currentBookCovers[currentIndex]
+        let targetBookCover = currentBookCovers[destinationIndex]
+        bookCovers.remove(at: currentBookCover.order)
+        bookCovers.insert(currentBookCover, at: targetBookCover.order)
+        currentBookCovers.remove(at: currentIndex)
+        currentBookCovers.insert(currentBookCover, at: destinationIndex)
+        output.send(.dragAndDropFinished)
+    }
 }