SwiftUI Patterns

Modern SwiftUI patterns for building declarative, performant user interfaces on Apple platforms. Covers the Observation framework, view composition, type-safe navigation, and performance optimization.

When to Activate

• Building SwiftUI views and managing state (@State, @Observable, @Binding)
• Designing navigation flows with NavigationStack
• Structuring view models and data flow
• Optimizing rendering performance for lists and complex layouts
• Working with environment values and dependency injection in SwiftUI

State Management

Property Wrapper Selection

Choose the simplest wrapper that fits:

@Observable ViewModel

Use @Observable (not ObservableObject) — it tracks property-level changes so SwiftUI only re-renders views that read the changed property:

@Observable
final class ItemListViewModel {
    private(set) var items: [Item] = []
    private(set) var isLoading = false
    var searchText = ""

    private let repository: any ItemRepository

    init(repository: any ItemRepository = DefaultItemRepository()) {
        self.repository = repository
    }

    func load() async {
        isLoading = true
        defer { isLoading = false }
        items = (try? await repository.fetchAll()) ?? []
    }
}

View Consuming the ViewModel

struct ItemListView: View {
    @State private var viewModel: ItemListViewModel

    init(viewModel: ItemListViewModel = ItemListViewModel()) {
        _viewModel = State(initialValue: viewModel)
    }

    var body: some View {
        List(viewModel.items) { item in
            ItemRow(item: item)
        }
        .searchable(text: $viewModel.searchText)
        .overlay { if viewModel.isLoading { ProgressView() } }
        .task { await viewModel.load() }
    }
}

Environment Injection

Replace @EnvironmentObject with @Environment:

// Inject
ContentView()
    .environment(authManager)

// Consume
struct ProfileView: View {
    @Environment(AuthManager.self) private var auth

    var body: some View {
        Text(auth.currentUser?.name ?? "Guest")
    }
}

View Composition

Extract Subviews to Limit Invalidation

Break views into small, focused structs. When state changes, only the subview reading that state re-renders:

struct OrderView: View {
    @State private var viewModel = OrderViewModel()

    var body: some View {
        VStack {
            OrderHeader(title: viewModel.title)
            OrderItemList(items: viewModel.items)
            OrderTotal(total: viewModel.total)
        }
    }
}

ViewModifier for Reusable Styling

struct CardModifier: ViewModifier {
    func body(content: Content) -> some View {
        content
            .padding()
            .background(.regularMaterial)
            .clipShape(RoundedRectangle(cornerRadius: 12))
    }
}

extension View {
    func cardStyle() -> some View {
        modifier(CardModifier())
    }
}

Navigation

Type-Safe NavigationStack

Use NavigationStack with NavigationPath for programmatic, type-safe routing:

@Observable
final class Router {
    var path = NavigationPath()

    func navigate(to destination: Destination) {
        path.append(destination)
    }

    func popToRoot() {
        path = NavigationPath()
    }
}

enum Destination: Hashable {
    case detail(Item.ID)
    case settings
    case profile(User.ID)
}

struct RootView: View {
    @State private var router = Router()

…