boutique-swiftui

name	boutique-swiftui
description	Integrate Boutique with SwiftUI views using onChange, onStoreDidLoad, bindings, and preview stores. Use when building SwiftUI views that display or react to Boutique-persisted data.

Boutique SwiftUI Integration

Use this skill when building SwiftUI views that display or react to data from Boutique's Store, @StoredValue, or @SecurelyStoredValue.

Displaying Store Items in a View

Inject an @Observable controller as @State and access items directly.

struct NotesListView: View {
    @State var notesController: NotesController

    var body: some View {
        List(self.notesController.notes) { note in
            Text(note.text)
        }
    }
}

Reacting to Store Changes with onChange

Use .onChange(of:initial:) to run code whenever the stored items change. The initial: true parameter ensures the closure also fires on first appearance.

struct NotesListView: View {
    @State var notesController: NotesController
    @State private var filteredNotes: [Note] = []

    var body: some View {
        List(self.filteredNotes) { note in
            Text(note.text)
        }
        .onChange(of: self.notesController.notes, initial: true) { _, newValue in
            self.filteredNotes = newValue.filter({ $0.text.count < 280 })
        }
    }
}

Waiting for Store to Load with onStoreDidLoad

When a Store is initialized synchronously, items load in a background task. Use onStoreDidLoad to show loading states or trigger actions once items are ready.

Callback-based

struct NotesView: View {
    @State var notesController: NotesController
    @State private var isLoaded = false

    var body: some View {
        Group {
            if self.isLoaded {
                NotesList(notes: self.notesController.notes)
            } else {
                ProgressView()
            }
        }
        .onStoreDidLoad(self.notesController.$notes, onLoad: {
            self.isLoaded = true
        }, onError: { error in
            print("Failed to load notes:", error)
        })
    }
}

Binding-based

struct NotesView: View {
    @State var notesController: NotesController
    @State private var hasLoaded = false

    var body: some View {
        Group {
            if self.hasLoaded {
                NotesList(notes: self.notesController.notes)
            } else {
                ProgressView()
            }
        }
        .onStoreDidLoad(self.notesController.$notes, update: self.$hasLoaded)
    }
}

StoredValue Bindings

Both @StoredValue and @SecurelyStoredValue provide a .binding property for two-way SwiftUI bindings.

Toggle with @StoredValue

@Observable
final class Preferences {
    @ObservationIgnored
    @StoredValue(key: "hasHapticsEnabled")
    var hasHapticsEnabled = false
}

struct SettingsView: View {
    @State var preferences: Preferences

    var body: some View {
        Form {
            Toggle(
                "Haptics",
                isOn: self.preferences.$hasHapticsEnabled.binding
            )
        }
    }
}

Picker with @StoredValue

struct ThemePickerView: View {
    @State var preferences: Preferences

    var body: some View {
        Picker("Theme", selection: self.preferences.$currentlySelectedTheme.binding) {
            Text("Light").tag(Theme.light)
            Text("Dark").tag(Theme.dark)
            Text("System").tag(Theme.system)
        }
    }
}

TextField with @SecurelyStoredValue

@SecurelyStoredValue bindings are optional (Binding<Item?>).

struct TokenView: View {
    @State var securityManager: SecurityManager

    var body: some View {
        let tokenBinding = Binding(
            get: { self.securityManager.authToken ?? "" },
            set: { try? self.securityManager.$authToken.set($0.isEmpty ? nil : $0) }
        )

        SecureField("Auth Token", text: tokenBinding)
    }
}

Performing Store Operations from Views

Wrap async store operations in Task blocks from button actions or gestures.

struct NoteRow: View {
    let note: Note
    @State var notesController: NotesController

    var body: some View {
        Text(self.note.text)
            .swipeActions(edge: .trailing) {
                Button("Delete", role: .destructive) {
                    Task {
                        try await self.notesController.removeNote(self.note)
                    }
                }
            }
    }
}

Preview Stores

In DEBUG builds, use Store.previewStore(items:) to create in-memory stores for SwiftUI previews.

Identifiable items (String or UUID ID)

#Preview {
    let store = Store<Note>.previewStore(items: [
        Note(id: "1", text: "First note", createdAt: .now),
        Note(id: "2", text: "Second note", createdAt: .now),
    ])
    let controller = NotesController(store: store)

    NotesListView(notesController: controller)
}

Custom cache identifier

#Preview {
    let store = Store<Bookmark>.previewStore(
        items: [Bookmark(url: URL(string: "https://example.com")!, title: "Example")],
        cacheIdentifier: \.url.absoluteString
    )
    // ...
}

Preview stores only hold items in memory and do not persist to disk. They are only available in DEBUG builds.

Full Example: Settings Screen

@Observable
final class AppPreferences {
    @ObservationIgnored
    @StoredValue(key: "hasHapticsEnabled")
    var hasHapticsEnabled = true

    @ObservationIgnored
    @StoredValue(key: "prefersDarkMode")
    var prefersDarkMode = false

    @ObservationIgnored
    @StoredValue(key: "fontSize")
    var fontSize: Double = 16.0
}

struct SettingsView: View {
    @State var preferences: AppPreferences

    var body: some View {
        Form {
            Section("Experience") {
                Toggle("Haptics", isOn: self.preferences.$hasHapticsEnabled.binding)
                Toggle("Dark Mode", isOn: self.preferences.$prefersDarkMode.binding)
            }

            Section("Display") {
                Slider(
                    value: self.preferences.$fontSize.binding,
                    in: 12...,
                    step: 
                ) {
                    ()
                }
            }
        }
    }
}

Notes

• @Observable controllers should be injected as @State in SwiftUI views.
• Use $controller.property to access the projected value for Boutique operations (insert, remove, set, etc.).
• onStoreDidLoad is a View modifier that wraps store.itemsHaveLoaded() in a .task block.
• Preview stores are #if DEBUG only and will not compile in Release builds.
• See boutique-store skill for building @Observable controllers with @Stored.
• See boutique-stored-values skill for all @StoredValue and @SecurelyStoredValue APIs.