feat: Todo 상세 미리보기 구현

Author: opficdev

Application/Presentation/PresentationShared/Sources/Todo/Detail/TodoDetailPreviewModifier.swift

@@ -0,0 +1,123 @@
+//
+//  TodoDetailPreviewModifier.swift
+//  PresentationShared
+//
+//  Created by opfic on 8/11/26.
+//
+
+import SwiftUI
+import ComposableArchitecture
+import Core
+import Domain
+
+public extension View {
+    func todoDetailPreview(todoId: String) -> some View {
+        modifier(TodoDetailPreviewModifier(todoId: todoId))
+    }
+}
+
+private struct TodoDetailPreviewModifier: ViewModifier {
+    @Environment(\.diContainer) private var container
+    let todoId: String
+
+    func body(content: Content) -> some View {
+        content.overlay {
+            TodoDetailPreviewInteractionView(
+                todoId: todoId,
+                makePreview: makePreviewViewController
+            )
+        }
+    }
+
+    private func makePreviewViewController() -> UIViewController {
+        let store = Store(
+            initialState: TodoDetailFeature.State(
+                todoId: todoId,
+                showEditButton: false
+            )
+        ) {
+            TodoDetailFeature()
+        } withDependencies: {
+            $0.fetchTodoByIdUseCase = container.resolve(FetchTodoByIdUseCase.self)
+            $0.fetchReferenceItemsUseCase = container.resolve(FetchReferenceItemsUseCase.self)
+        }
+        return UIHostingController(rootView: TodoDetailPreviewView(store: store))
+    }
+}
+
+private struct TodoDetailPreviewInteractionView: UIViewRepresentable {
+    let todoId: String
+    let makePreview: () -> UIViewController
+
+    func makeCoordinator() -> TodoDetailPreviewInteractionCoordinator {
+        TodoDetailPreviewInteractionCoordinator()
+    }
+
+    func makeUIView(context: Context) -> UIView {
+        let view = UIView()
+        view.backgroundColor = .clear
+        view.isAccessibilityElement = false
+        context.coordinator.update(todoId: todoId, makePreview: makePreview)
+        context.coordinator.install(on: view)
+        return view
+    }
+
+    func updateUIView(_ view: UIView, context: Context) {
+        context.coordinator.update(todoId: todoId, makePreview: makePreview)
+    }
+}
+
+private final class TodoDetailPreviewInteractionCoordinator: NSObject {
+    private weak var view: UIView?
+    private var contextMenuInteraction: UIContextMenuInteraction?
+    private var todoId = ""
+    private var makePreview: (() -> UIViewController)?
+
+    func update(
+        todoId: String,
+        makePreview: @escaping () -> UIViewController
+    ) {
+        self.todoId = todoId
+        self.makePreview = makePreview
+    }
+
+    func install(on view: UIView) {
+        guard self.view !== view else { return }
+
+        if let contextMenuInteraction {
+            self.view?.removeInteraction(contextMenuInteraction)
+        }
+
+        let contextMenuInteraction = UIContextMenuInteraction(delegate: self)
+        view.addInteraction(contextMenuInteraction)
+        self.view = view
+        self.contextMenuInteraction = contextMenuInteraction
+    }
+}
+
+extension TodoDetailPreviewInteractionCoordinator: UIContextMenuInteractionDelegate {
+    func contextMenuInteraction(
+        _ interaction: UIContextMenuInteraction,
+        configurationForMenuAtLocation location: CGPoint
+    ) -> UIContextMenuConfiguration? {
+        guard let makePreview else { return nil }
+
+        let preferredContentSize = preferredContentSize(for: interaction.view)
+        return UIContextMenuConfiguration(
+            identifier: todoId as NSString,
+            previewProvider: {
+                let viewController = makePreview()
+                viewController.preferredContentSize = preferredContentSize
+                return viewController
+            },
+            actionProvider: nil
+        )
+    }
+
+    private func preferredContentSize(for view: UIView?) -> CGSize {
+        let bounds = view?.window?.bounds ?? view?.bounds ?? .zero
+        let width = min(420, max(280, bounds.width - 32))
+        let height = min(640, max(320, bounds.height * 0.7))
+        return CGSize(width: width, height: height)
+    }
+}

Application/Presentation/PresentationShared/Sources/Todo/Detail/TodoDetailPreviewView.swift

@@ -0,0 +1,40 @@
+//
+//  TodoDetailPreviewView.swift
+//  PresentationShared
+//
+//  Created by opfic on 8/11/26.
+//
+
+import SwiftUI
+import ComposableArchitecture
+
+struct TodoDetailPreviewView: View {
+    @State var store: StoreOf<TodoDetailFeature>
+
+    var body: some View {
+        ZStack {
+            Color(.systemGroupedBackground).ignoresSafeArea()
+            if let todo = store.todo {
+                TodoDetailContentView(
+                    title: todo.title,
+                    content: todo.content,
+                    referenceItems: store.referenceItems,
+                    number: todo.number,
+                    onOpenTodoID: nil
+                )
+            } else if store.alert != nil {
+                ContentUnavailableView {
+                    Label(
+                        String(localized: "common_error_title"),
+                        systemImage: "exclamationmark.triangle"
+                    )
+                } description: {
+                    Text(String(localized: "common_error_message"))
+                }
+            } else {
+                LoadingView()
+            }
+        }
+        .onAppear { store.send(.onAppear) }
+    }
+}