@Reducer struct FeatureReducer { @ObservableState struct State { var isLoading = false var items: [Item] = [] } enum Action { case loadItems case itemsLoaded([Item]) } var body: some Reducer<State, Action> { Reduce { state, action in switch action { case .loadItems: state.isLoading = true return .send(.itemsLoaded(mockData)) case .itemsLoaded(let items): state.isLoading = false state.items = items return .none } } } }

// Domain Layer protocol UserRepository { func getUsers() async throws -> [User] } // Data Layer class NetworkUserRepository: UserRepository { func getUsers() async throws -> [User] { // Network implementation } } // Presentation Layer @Observable class UsersViewModel { private let userRepository: UserRepository var users: [User] = [] var isLoading = false init(userRepository: UserRepository) { self.userRepository = userRepository } func loadUsers() async { isLoading = true defer { isLoading = false } do { users = try await userRepository.getUsers() } catch { // Handle error } } }

// Package.swift structure products: [ .library(name: "CoreModule", targets: ["Core"]), .library(name: "FeatureAuth", targets: ["Auth"]), .library(name: "FeatureFeed", targets: ["Feed"]), .library(name: "NetworkLayer", targets: ["Network"]), .library(name: "UIComponents", targets: ["UI"]) ] // Modular dependency injection @main struct MyApp: App { let container = DependencyContainer() var body: some Scene { WindowGroup { ContentView() .environmentObject(container.userService) .environmentObject(container.networkService) } } }

import SwiftUI import RealityKit struct SpatialSocialApp: App { var body: some Scene { WindowGroup { SpatialSocialView() } .windowStyle(.volumetric) ImmersiveSpace(id: "socialSpace") { SocialImmersiveView() } .immersionStyle(selection: .constant(.mixed), in: .mixed) } } struct SpatialSocialView: View { @State private var posts: [Post] = [] var body: some View { NavigationStack { ScrollView { LazyVStack(spacing: 20) { ForEach(posts) { post in PostCard3D(post: post) .frame(depth: 50) .hoverEffect(.highlight) } } } .navigationTitle("Social Space") } } }

// Interactive Widgets struct InteractiveWidgetView: View { var body: some View { VStack { Text("Quick Actions") .font(.headline) Button("Order Coffee") { // Direct widget action } .buttonStyle(.borderedProminent) .controlSize(.large) ProgressView(value: 0.7) .progressViewStyle(.linear) } .containerBackground(.fill.tertiary, for: .widget) } } // Live Activities struct DeliveryActivityAttributes: ActivityAttributes { public struct ContentState: Codable, Hashable { var estimatedDeliveryTime: Date var currentStatus: String } var orderNumber: String } // Apple Intelligence Ready struct SmartSuggestionsView: View { @State private var suggestions: [Suggestion] = [] var body: some View { ForEach(suggestions) { suggestion in SuggestionCard(suggestion) .aiEnhanced() // Custom modifier for AI features } } }

import CoreML import CreateML class SmartRecommendationEngine { private var model: MLModel? init() { loadModel() } private func loadModel() { guard let modelURL = Bundle.main.url( forResource: "RecommendationModel", withExtension: "mlmodelc" ) else { return } model = try? MLModel(contentsOf: modelURL) } func getRecommendations( for user: User ) async -> [Recommendation] { guard let model = model else { return [] } // Prepare input features let features = prepareFeatures(from: user) // Run prediction guard let prediction = try? model.prediction( from: features ) else { return [] } return parseRecommendations(from: prediction) } }

import Vision import CoreImage class ImageAnalysisService { func analyzeImage(_ image: UIImage) async -> ImageAnalysis { return await withCheckedContinuation { continuation in guard let cgImage = image.cgImage else { continuation.resume(returning: ImageAnalysis.empty) return } // Object Detection let objectRequest = VNDetectRectanglesRequest { request, error in let objects = request.results as? [VNRectangleObservation] ?? [] // Text Recognition let textRequest = VNRecognizeTextRequest { textRequest, textError in let texts = textRequest.results as? [VNRecognizedTextObservation] ?? [] let analysis = ImageAnalysis( objects: objects, recognizedTexts: texts, confidence: objects.first?.confidence ?? 0 ) continuation.resume(returning: analysis) } let handler = VNImageRequestHandler(cgImage: cgImage) try? handler.perform([textRequest]) } let handler = VNImageRequestHandler(cgImage: cgImage) try? handler.perform([objectRequest]) } } }

// Biometric Authentication import LocalAuthentication class BiometricAuthManager { func authenticate() async -> Bool { let context = LAContext() guard context.canEvaluatePolicy( .deviceOwnerAuthenticationWithBiometrics, error: nil ) else { return false } do { return try await context.evaluatePolicy( .deviceOwnerAuthenticationWithBiometrics, localizedReason: "Authenticate to access your account" ) } catch { return false } } } // Secure Network Layer class SecureNetworkManager { private let session: URLSession init() { let configuration = URLSessionConfiguration.default configuration.tlsMinimumSupportedProtocolVersion = .TLSv13 session = URLSession( configuration: configuration, delegate: CertificatePinningDelegate(), delegateQueue: nil ) } }

import XCTest import Testing // iOS 18 Testing Framework @Suite("Social Media Tests") struct SocialMediaTests { @Test("User registration succeeds") func userRegistration() async throws { let authService = MockAuthService() let user = User(email: "test@example.com") let result = try await authService.register(user) #expect(result.isSuccess) #expect(result.user?.email == "test@example.com") } @Test("Post creation with validation") func postCreation() async throws { let postService = MockPostService() let post = Post(content: "Hello World!") let result = try await postService.create(post) #expect(result.isSuccess) #expect(result.post?.content == "Hello World!") } }

import XCTest class SocialMediaUITests: XCTestCase { func testUserFlow() throws { let app = XCUIApplication() app.launch() // Test login flow app.textFields["Email"].tap() app.textFields["Email"].typeText("user@example.com") app.secureTextFields["Password"].tap() app.secureTextFields["Password"].typeText("password123") app.buttons["Sign In"].tap() // Verify home screen XCTAssertTrue(app.navigationBars["Home"].exists) XCTAssertTrue(app.scrollViews["Feed"].exists) // Test post creation app.buttons["Create Post"].tap() app.textViews["Post Content"].typeText("Hello World!") app.buttons["Share"].tap() // Verify post appears XCTAssertTrue(app.staticTexts["Hello World!"].exists) } }

import XCTest class PerformanceTests: XCTestCase { func testLaunchPerformance() throws { measure(metrics: [XCTApplicationLaunchMetric()]) { XCUIApplication().launch() } } func testScrollPerformance() throws { let app = XCUIApplication() app.launch() let scrollView = app.scrollViews["Feed"] measure(metrics: [XCTOSSignpostMetric.scrollDecelerationMetric]) { scrollView.swipeUp(velocity: .fast) scrollView.swipeDown(velocity: .fast) } } func testMemoryUsage() throws { let app = XCUIApplication() measure(metrics: [XCTMemoryMetric()]) { app.launch() // Simulate heavy usage for _ in 0..<100 { app.buttons["Load More"].tap() app.swipeUp() } } } }