swiftui-expert-skill

Write, review, or improve SwiftUI code following best practices for state management, view composition, performance, macOS-specific APIs, and iOS 26+ Liquid Glass adoption. Use when building new SwiftUI features, refactoring existing views, reviewing code quality, or adopting modern SwiftUI patterns. Also triggers whenever an Xcode Instruments `.trace` file is referenced (to analyse it) or the user asks to **record** a new trace — attach to a running app, launch one fresh, or capture a manually-stopped session with the bundled `record_trace.py`. A target SwiftUI source file is optional; if provided it grounds recommendations in specific lines, but a trace alone is enough to diagnose hangs, hitches, CPU hotspots, and high-severity SwiftUI updates.

1.16x

Quality

92%

Does it follow best practices?

Impact

100%

1.16x

Average score across 3 eval scenarios

Securityby

Passed

No known issues

Evaluation results

100%

Profile Settings Feature Modernization

Deprecated API replacement and state modernization

Criteria

Without context

With context

Observable macro

100%

MainActor annotation

100%

@State for owned model

100%

@Bindable for injected observable

100%

Passed value not @State

100%

NavigationStack

100%

navigationTitle modifier

100%

foregroundStyle modifier

100%

onChange without perform

100%

onSubmit instead of onCommit

100%

sensoryFeedback haptics

100%

@Entry macro for environment

100%

Social Feed View for Mosaic App

Performance patterns for large lists and animations

Criteria

Without context

With context

Lazy scroll container

100%

Stable ForEach identity

100%

No AnyView in rows

100%

No inline filtering in ForEach

100%

No heavy body computation

100%

Animation with value param

100%

Extracted row subview

100%

@State private

100%

@Observable model

100%

Passed values not @State

100%

foregroundStyle used

100%

24%

Canvas Drawing App Floating Toolbar

Liquid Glass UI with fallbacks and accessibility

Criteria

Without context

With context

GlassEffectContainer grouping

100%

glassEffect after padding

100%

interactive() on buttons only

50%

100%

#available iOS 26 guard

100%

Material fallback

100%

Button not onTapGesture

100%

accessibilityLabel on icon buttons

100%

Decorative images hidden

100%

@ScaledMetric for sizes

88%

100%

Container spacing matches layout

100%

@State private

100%

Repository: avdlee/swiftui-agent-skill
Commit: 0066966

Evaluated: 11 days ago
Agent: Claude Code
Model: Claude Sonnet 4.6

Table of Contents

Profile Settings Feature Modernization Social Feed View for Mosaic App Canvas Drawing App Floating Toolbar

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