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Build or revise a production macOS SwiftUI app using native scenes, state, commands, settings, and current platform conventions.
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Basado en la clasificación ocupacional SOC
Audit macOS SwiftUI accessibility for correctness, current APIs, and production conventions. Use for that domain or as part of a full audit.
Audit macOS SwiftUI animation motion for correctness, current APIs, and production conventions. Use for that domain or as part of a full audit.
Audit macOS SwiftUI api currency for correctness, current APIs, and production conventions. Use for that domain or as part of a full audit.
Audit macOS SwiftUI appearance color for correctness, current APIs, and production conventions. Use for that domain or as part of a full audit.
Audit macOS SwiftUI appkit interop for correctness, current APIs, and production conventions. Use for that domain or as part of a full audit.
Audit macOS SwiftUI appkit overuse for correctness, current APIs, and production conventions. Use for that domain or as part of a full audit.
| name | build-macos-swiftui |
| description | Build or revise a production macOS SwiftUI app using native scenes, state, commands, settings, and current platform conventions. |
Let <swiftui-plugin-root> be the absolute plugin directory two levels above this SKILL.md. Resolve that path before running commands or opening shared references. When these instructions say swiftui-ctx, invoke <swiftui-plugin-root>/scripts/swiftui-ctx; do not assume the command is on PATH.
Write correct, current, idiomatic macOS SwiftUI. This catalog encodes the mistakes AI makes on the
Mac and the current rule for each. The target is always macOS; iOS appears only as a ❌ contrast.
Depth for any topic is one hop away in references/.
Write-time vs. audit. This skill (+ its
swiftui-revieweragent and the quickscripts/macos-swiftui-lint.sh— a 67-rule write-time quick-lint) is the write-time authoring + review path. For a deep, whole-codebase audit of a finished project, use theaudit-macos-swiftui-fullorchestrator and the 28audit-swiftui-*skills (the separate, shared 334-rule audit enginescripts/swiftui-lint.sh— 282 grep tells + 52 ast-grep — Sosumi +swiftui-ctxverification, findings written toswiftui-audits/). The two are complementary, not rivals.Verify APIs against the live catalog. Before emitting any non-trivial API, run
swiftui-ctx lookup <api>(theswiftui-examplesskill) for the real consensus shape —references/api-currency.mdis a curated summary, not a substitute for the live corpus.
Use for SwiftUI code correctness on macOS: state & data flow, scenes/windows/menu bar, navigation/sidebars/toolbars, AppKit bridging, concurrency, layout & tables, controls & pointer interaction, Liquid Glass, SwiftData, sandbox & file access, previews.
Not for (say so and stop — these are other concerns, not this skill's job):
horizontalSizeClass, or an iOS-only toolbar placement as the answer.references/api-currency.md, not your prior. If an API is not there or in Apple docs,
say so and offer a safe alternative — do not invent it. The most probable token for an unknown
API is a plausible hallucination (.glassBackground() does not exist).#available(macOS 26, *) / @available(macOS 14, *)
— never gate only on the iOS arm (the single mistake even good artifacts make).@Observable final class owned at the App level. Do not
force MVVM/VIPER.Ordered by frequency × impact × macOS-uniqueness. Sev: C=critical (broken/net-negative),
H=high (wrong-but-compiles / non-idiomatic), M=med (stale-but-works). → is the deep doc.
| # | Symptom (what AI emits) | Correct macOS rule | Sev | → |
|---|---|---|---|---|
| 1 | NavigationView { … } for new code | NavigationStack, or for a sidebar app NavigationSplitView (deprecated through OS 26.5) | C | navigation-and-toolbars.md |
| 2 | Invents .glassBackground() / .liquidGlass() / .material(.glass) / LiquidGlassView | Real API: glassEffect(_:in:), GlassEffectContainer, .buttonStyle(.glass) — the rest don't exist | C | liquid-glass.md |
| 3 | macOS-26/14-only API with no #available/@available gate | Gate every above-floor API on the macOS arm (#available(macOS 26, *)) | C | version-and-hallucination.md |
| 4 | @ObservedObject var x = Model() — view creates what it doesn't own | Owner uses @State (@Observable) or @StateObject (ObservableObject); else silent state reset | C | state-and-observation.md |
| 5 | @Observable kept as : ObservableObject + @Published + @StateObject | Under @Observable: no @Published, no conformance, own with @State | C | state-and-observation.md |
| 6 | No Settings {} scene / no MenuBarExtra; menu-bar app faked with NSStatusItem | Use the Settings {} scene (+ SettingsLink) and MenuBarExtra — Mac-only primitives | C | scenes-and-windows.md |
| 7 | No .commands {}; menu actions faked as in-window buttons | Declare main-menu actions via .commands { CommandGroup / CommandMenu } | C | menus-and-commands.md |
| 8 | SwiftData let on a bidirectional relationship | Use var; let compiles but crashes at runtime | C | swiftdata.md |
| 9 | Non-Sendable class crossing a @MainActor→background Task boundary | Swift 6 = strict data-race checking by default (error): make it Sendable / actor-isolate / stay on-actor | C | concurrency.md |
| 10 | NSViewRepresentable with no updateNSView | Implement updateNSView or SwiftUI state never reaches the AppKit view | C | appkit-interop.md |
| 11 | Sidebar/document app wrapped in NavigationStack | macOS sidebar IA wants NavigationSplitView (2–3 columns) | H | navigation-and-toolbars.md |
| 12 | .foregroundColor(_:) | Deprecated → .foregroundStyle(_:) | H | version-and-hallucination.md |
| 13 | Single-param .onChange(of:) { newValue in } | Two-param { old, new in } (+ optional initial:) | H | version-and-hallucination.md |
| 14 | DispatchQueue.main.async in async/SwiftUI code | @MainActor / await MainActor.run — GCD bypasses isolation checking | H | concurrency.md |
| 15 | $obs.prop on a non-owned @Observable with no @Bindable | Re-wrap with @Bindable to project $ | H | state-and-observation.md |
| 16 | Arbitrary file paths in a sandboxed Mac app (no consent) | fileImporter/NSOpenPanel grant; raw paths silently fail | C | sandbox-and-files.md |
| 17 | Re-opening a user-picked file next launch with no bookmark | Persist bookmarkData(.withSecurityScope) + start/stopAccessingSecurityScopedResource() | H | sandbox-and-files.md |
| 18 | Single-column List of struct fields where macOS wants a Table | Table + TableColumn + sortOrder: (sortable clickable headers) | H | layout-and-tables.md |
| 19 | Menu command can't reach the active window's state | Route via @FocusedValue; .disabled(focusedValue == nil) | H | menus-and-commands.md |
| 20 | Glass effect on content (lists/cards/backgrounds) | Liquid Glass is navigation-layer-only — never on content | H | liquid-glass.md |
| 21 | bare Task {} in .onAppear for view-lifecycle async | .task {} / .task(id:) — auto-cancelled on disappear | H | concurrency.md |
| 22 | WindowGroup/Window with no .defaultSize/.windowResizability/root minWidth | Size scenes explicitly | H | scenes-and-windows.md |
| 23 | openWindow/openSettings from a MenuBarExtra with no NSApp.activate | Activate the app or the window opens with no front window (the multi-hour trap) | H | scenes-and-windows.md |
| 24 | @Sendable closure body touches self./a main-actor property | Isolate the closure @MainActor or capture-by-value for reads | H | concurrency.md |
| 25 | Custom interactive Mac view with no .onHover / no .help | Add pointer affordances — Mac is not touch | H | controls-and-pointer.md |
| 26 | Row/item views with no right-click .contextMenu | Mac users expect right-click menus | H | controls-and-pointer.md |
| 27 | SwiftData relationship assigned inside init | Assign after inserting into the context, not in init (data vanishes on relaunch) | H | swiftdata.md |
| 28 | #Preview of a SwiftData/@Query view with no in-memory container | .modelContainer(for: …, inMemory: true) or the canvas crashes | H | previews.md |
| 29 | Splitting an @Observable-reading view into computed var x: some View | Extract into separate View types — computed props lose per-property invalidation | H | state-and-observation.md |
| 30 | placement: .navigationBarLeading/.navigationBarTrailing on macOS | iOS-only → .primaryAction/.principal/.navigation | H | navigation-and-toolbars.md |
| 31 | .navigationBarTitle / navigationBarTitleDisplayMode | iOS-only → .navigationTitle | M | navigation-and-toolbars.md |
| 32 | @EnvironmentObject for an injected @Observable dependency | .environment(instance) + @Environment(Type.self) | H | state-and-observation.md |
| 33 | .cornerRadius(_:) | Deprecated → .clipShape(.rect(cornerRadius:)) | M | version-and-hallucination.md |
| 34 | Old tabItem {} / inline-destination NavigationLink in lists | Tab(...) {} and value-based .navigationDestination(for:) | M | version-and-hallucination.md |
| 35 | Copying Apple's fatalError-on-ModelContainer / @Model with no init | Handle container failure gracefully; supply a real initializer | H | swiftdata.md |
| 36 | loadTransferable/drag-drop that compiled pre-Swift-6 now errors | Make Transferable conformances/closures Sendable-correct; .draggable/.dropDestination | H | sandbox-and-files.md |
| 37 | App Sandbox on but file/network entitlements off | Declare matching .entitlements keys; sandbox-on + capability-off silently denies | H | sandbox-and-files.md |
| 38 | PreviewProvider struct + hand-rolled EnvironmentKey boilerplate | #Preview { }, @Previewable @State, one-line @Entry var | M | previews.md |
| 39 | Blanket @MainActor spam OR assuming main-actor-by-default is automatic | It's an opt-in Swift 6.2 build mode (-default-isolation MainActor), not the language default | M | concurrency.md |
| 40 | Form {} with no .formStyle(.grouped); wrong listStyle/controlSize density | .formStyle(.grouped), .listStyle(.sidebar), .controlSize for Mac density | M | controls-and-pointer.md |
| 41 | becomeFirstResponder() on a SwiftUI value / NSView missing acceptsFirstResponder | First-responder goes through AppKit, or SwiftUI @FocusState/.focusable() | H | appkit-interop.md |
| 42 | @Model relationship arrays treated as ordered; off-thread mutation | Sort explicitly (@Query(sort:)/SortDescriptor); mutate on the context's actor (@ModelActor) | H | swiftdata.md |
| 43 | Glass-on-glass / sibling glass with no GlassEffectContainer | Never nest glass; group siblings in a GlassEffectContainer (glass can't sample glass) | M | liquid-glass.md |
| 44 | Representable with @Binding but no makeCoordinator()/delegate wiring | Add a Coordinator + delegate = context.coordinator | H | appkit-interop.md |
| 45 | Mutating SwiftData but never saving; relying on auto-save | try modelContext.save() at meaningful boundaries — auto-save is unreliable | H | swiftdata.md |
| 46 | NSGlassEffectView glass turns opaque when its window isn't key (no .state fix) | AppKit glass has no active-state API; for translucent non-key/HUD overlays fall back to NSVisualEffectView | C | appkit-liquid-glass.md |
| 47 | @main App with only WindowGroup — won't quit on last window close, no global NSApp setup | Add @NSApplicationDelegateAdaptor; applicationShouldTerminateAfterLastWindowClosed { true } | H | scenes-and-windows.md |
| 48 | .ultraThinMaterial sidebar looks flat (no real vibrancy) | Window-scoped material ≠ behind-window vibrancy; wrap NSVisualEffectView(material: .sidebar, blendingMode: .behindWindow) | H | appkit-interop.md |
| 49 | Heavy work in body/init, .id(UUID()), AnyView, filter-in-ForEach | Hoist formatters; stable ids; @ViewBuilder not AnyView; derive collections upstream | H | view-performance.md |
| 50 | openWindow(id:) silently does nothing | The id must match a Window(id:)/WindowGroup(id:) exactly (shared constant); test at runtime | M | scenes-and-windows.md |
| 51 | MenuBarExtra→openSettings/openWindow one-liner shows no window on macOS 26 | The NSApp.activate()+openSettings() fix regressed on Tahoe — needs a hidden Window scene + setActivationPolicy(.regular) toggle | H | scenes-and-windows.md |
| 52 | Text("a") + Text("b") (the Text + operator) | Deprecated macOS 26.0 → string interpolation Text("a \(b)") | M | version-and-hallucination.md |
The era-boundaries where a pre-2024 prior is stale. Full detail + availability strings in
references/api-currency.md.
| Era boundary | Wrong (stale default) | Right (current) | macOS floor |
|---|---|---|---|
| NavigationView deprecation (2022) | NavigationView {} | NavigationStack / NavigationSplitView | macOS 13 |
@Observable macro (2023) | class VM: ObservableObject { @Published } + @StateObject | @Observable class VM + @State/@Bindable/@Environment(Type.self) | macOS 14 |
Two-param onChange (2023) | .onChange(of:) { newValue in } | .onChange(of:, initial:) { old, new in } | macOS 14 |
#Preview/@Previewable/@Entry (2023–24) | PreviewProvider + manual EnvironmentKey | #Preview { @Previewable @State }, @Entry var | macOS 14 |
| Style deprecations (rolling) | .foregroundColor, .cornerRadius, tabItem | .foregroundStyle, .clipShape(.rect(cornerRadius:)) | macOS 12 |
tabItem → Tab(){} | tabItem {} / TabView without Tab | Tab("Label", systemImage:) {} inside TabView | macOS 15 |
| Swift 6 strict concurrency (2024) | non-Sendable across actors; DispatchQueue.main.async | Sendable-correct, @MainActor, .task | toolchain |
| Swift 6.2 approachable concurrency (2025) | assume main-actor-by-default everywhere | opt-in -default-isolation MainActor build mode | toolchain 6.2 |
| Liquid Glass (2025) | .glassBackground() / .liquidGlass() (invented) | glassEffect(_:in:), GlassEffectContainer, .buttonStyle(.glass) — #available(macOS 26) | macOS 26 |
Settings {} scene | NSApp.sendAction(showSettingsWindow:) / Preferences {} | Settings {} scene | macOS 11 |
SettingsLink | manual NSApp.sendAction(showSettingsWindow:) | SettingsLink (requires Settings {} scene) | macOS 14 |
These have no iOS analogue, so an iOS-trained model never reaches for them (it doesn't get them wrong — it omits them). Reaching for these is what makes code feel native.
Settings {} + SettingsLink; MenuBarExtra; Window (single-instance) vs
WindowGroup; .defaultSize/.windowResizability/.windowStyle; openWindow/openSettings/dismissWindow. → scenes-and-windows.md.commands {}, CommandGroup(replacing:/after:), CommandMenu,
SidebarCommands(), app-global .keyboardShortcut on menu items, @FocusedValue routing. → menus-and-commands.md.onHover, right-click .contextMenu, .help() tooltips. → controls-and-pointer.mdacceptsFirstResponder/makeFirstResponder, SwiftUI
.focusable()/@FocusState. → appkit-interop.mdNSViewRepresentable/NSViewControllerRepresentable (+ updateNSView/
Coordinator/dismantleNSView), the NSHostingController/NSHostingView reverse bridge. → appkit-interop.mdTable/TableColumn with sortable, multi-column, clickable headers;
.formStyle(.grouped), .controlSize, HSplitView. → layout-and-tables.mdNavigationSplitView 2–3-column sidebar (the default Mac shell); columnVisibility. → navigation-and-toolbars.mdfileImporter/NSOpenPanel consent. → sandbox-and-files.mdglassEffect, GlassEffectContainer, .buttonStyle(.glass/.glassProminent),
glassEffectID/glassEffectUnion. → liquid-glass.mdNSGlassEffectView/NSGlassEffectContainerView/NSBackgroundExtensionView/
NSView.LayoutRegion/prefersCompactControlSizeMetrics; the inactive-window opacity trap. → appkit-liquid-glass.mdLoad the named reference when you touch that area. Each block lists the always-true rules; the doc has the ❌/✅ code.
State & observation — @Observable final class for reference models; own with @State, bind a
non-owned one with @Bindable, inject by type via .environment(x) + @Environment(T.self). No
@Published/ObservableObject/@StateObject for new code. Never @ObservedObject var x = T(). Split
big views into View types, not computed vars. → references/state-and-observation.md
Version drift & hallucination — Cross-check every API against references/api-currency.md. Bans:
NavigationView, .foregroundColor, .cornerRadius, single-param onChange, tabItem. Never emit
an API you can't cite; gate new APIs on the macOS arm. → references/version-and-hallucination.md
Scenes & windows — WindowGroup/Window/Settings {}/MenuBarExtra are the scene vocabulary.
Open via openWindow/openSettings; from a MenuBarExtra, also NSApp.activate. Always set
.defaultSize/.windowResizability. → references/scenes-and-windows.md
Menus & commands — Real Mac chrome uses .commands {} with CommandMenu/CommandGroup(replacing:/ after:/before:); wire actions to the focused window via @FocusedValue; .keyboardShortcut belongs on
menu items. → references/menus-and-commands.md
AppKit interop — NSViewRepresentable needs makeNSView/updateNSView/makeCoordinator and
dismantleNSView for teardown; delegates round-trip through the Coordinator; first responder is
window-scoped. Watch the Swift-6 Sendable-closure boundary. → references/appkit-interop.md
Navigation, sidebars & toolbars — NavigationSplitView (2-col init(sidebar:detail:) / 3-col
init(sidebar:content:detail:)), columnVisibility, sidebar .listStyle(.sidebar). Toolbar
placements .primaryAction/.principal/.navigation; .navigationTitle. → references/navigation-and-toolbars.md
Concurrency — Swift 6 default = strict data-race checking; main-actor-by-default is an opt-in
6.2 build mode. .task/.task(id:) not Task {} in lifecycle; no DispatchQueue.main.async; make
cross-actor types Sendable. → references/concurrency.md
Layout & tables — Resizable windows: .frame(minWidth:idealWidth:maxWidth:…) + scene
.defaultSize/.windowResizability. Multi-field rows → Table + TableColumn + sortOrder:.
.controlSize for density. → references/layout-and-tables.md
Controls & pointer — .formStyle(.grouped); .onHover; right-click .contextMenu; .focusable()
@FocusState; .help() tooltips. Mac is pointer-driven, not touch. → references/controls-and-pointer.mdLiquid Glass (macOS 26) — Real names only (glassEffect(_:in:), GlassEffectContainer,
.buttonStyle(.glass/.glassProminent)). Glass on the navigation layer only, never content, never
glass-on-glass; group siblings in GlassEffectContainer; gate #available(macOS 26, *) with an
.ultraThinMaterial fallback. Glass.interactive() is macOS 26 too (pointer-driven, not iOS-only). → references/liquid-glass.md
SwiftData — var (never let) relationships; assign relationships after insert, not in init;
in-memory container for previews; handle ModelContainer errors (no fatalError); explicit
try modelContext.save(). → references/swiftdata.md
App Sandbox & files — Holding a URL ≠ being allowed to open it. fileImporter/NSOpenPanel
consent; security-scoped bookmarks for re-access; declare entitlements; Transferable/.dropDestination
(Sendable-correct) for drag-drop; no UIPasteboard. → references/sandbox-and-files.md
Previews — #Preview {} not PreviewProvider; @Previewable @State inside previews; @Entry
for environment values; in-memory container for SwiftData previews; inject @Environment models.
→ references/previews.md
AppKit Liquid Glass (macOS 26) — the AppKit glass surface: NSGlassEffectView (+ the
inactive/non-key-window opacity trap — no .state fix), NSGlassEffectContainerView (children set
their own cornerRadius), NSBackgroundExtensionView, NSView.LayoutRegion corner-avoidance,
prefersCompactControlSizeMetrics. → references/appkit-liquid-glass.md
View rendering performance — avoid heavy work in body/init, .id(UUID()), AnyView, and
filter/sort inside ForEach; know the SwiftUI Table large-dataset ceiling (fall back to
NSTableView); Intel-Mac glass cost. → references/view-performance.md
Before proposing code, run the grep lint and fix every hard-fail:
bash <swiftui-plugin-root>/scripts/macos-swiftui-lint.sh <files-or-dir>. The full 67-rule list
(WRONG → correct, mapped to each doc) is references/lint-checklist.md.
This skill ships a closed loop — use it to legitimately claim rung 2+ of the Output Contract:
scripts/macos-swiftui-lint.sh) — fast grep self-check; hard-fails exit non-zero.PostToolUse hook (hooks/hooks.json → swiftui-build-check.sh) builds the
enclosing project for the macOS destination after each Swift edit and blocks on compile errors.
It needs Xcode + the macOS 26 SDK and a real Xcode/SwiftPM project; it no-ops elsewhere.swiftui-reviewer subagent audits a diff against this catalog and reports
FILE / RULE / LINE / VIOLATION / FIX. Invoke it before declaring a change done.State the verification rung you actually reached. "Compiles" requires the hook/build to have run green.
api-currency.md).| File | Read when |
|---|---|
references/api-currency.md | Any concrete API — the real-vs-deprecated-vs-hallucinated ground truth |
references/state-and-observation.md | @Observable / @State / @Bindable / @Environment, ownership, re-render bugs |
references/version-and-hallucination.md | Deprecations, hallucinated modifiers, #available(macOS) gating |
references/scenes-and-windows.md | WindowGroup / Window / Settings / MenuBarExtra, openWindow, activation trap |
references/menus-and-commands.md | .commands, CommandGroup/CommandMenu, @FocusedValue, keyboard shortcuts |
references/appkit-interop.md | NSViewRepresentable, Coordinator, first responder, NSHostingController |
references/navigation-and-toolbars.md | NavigationSplitView sidebars, columnVisibility, toolbar placements |
references/concurrency.md | Swift 6 / 6.2, @MainActor, Sendable, .task vs Task |
references/layout-and-tables.md | Resizable-window sizing, List vs Table, controlSize |
references/controls-and-pointer.md | formStyle, hover, right-click, focusable, help tooltips |
references/liquid-glass.md | macOS 26 glass: real APIs, navigation-layer rule, gating |
references/swiftdata.md | @Model relationships, container, previews, save |
references/sandbox-and-files.md | App Sandbox, entitlements, security-scoped bookmarks, drag-drop |
references/previews.md | #Preview / @Previewable / @Entry, SwiftData/env preview crashes |
references/appkit-liquid-glass.md | The AppKit glass surface (NSGlassEffectView…) + the inactive-window trap |
references/view-performance.md | Rendering anti-patterns, Table large-dataset ceiling, Intel-Mac glass cost |
references/lint-checklist.md | The 67 grep tells (mirrors the lint script) |