Swift AI Code Fix

Swift AI Code Fix

Overview

Use this skill to audit LLM-generated Swift/SwiftUI code and apply a targeted modernization pass for iOS 18+ (or 26+ where noted). Focus on deprecations, accessibility, performance, and concurrency correctness.

Workflow

1. Confirm platform targets and constraints

• Assume iOS 18+ unless told otherwise.
• If the user targets iOS 15–17, keep compatibility alternatives and avoid iOS 18+ APIs where required.
• Ask if CloudKit is used when SwiftData models contain uniqueness constraints.

2. Run a fast modernization sweep

• Replace deprecated view modifiers and legacy navigation/tab APIs.
• Convert tap gestures to Buttons for accessibility unless location/tap count is needed.
• Swap ObservableObject for @Observable unless Combine publishers are required.
• Prefer modern URL, image rendering, and sleep APIs.

3. Review structure and performance

• Split computed-property view fragments into their own SwiftUI View types when using @Observable.
• Reduce GeometryReader usage and fixed frames.
• Avoid many types in a single file to keep build times reasonable.

4. Validate behavior and API existence

• Cross-check any unfamiliar APIs against current SDK docs.
• Avoid hallucinated methods or incorrect signatures.

Fix Checklist (Apply When Seen)

SwiftUI view modifiers and styling

• Replace foregroundColor(...) → foregroundStyle(...).
• Replace cornerRadius(...) → clipShape(.rect(cornerRadius: ...)).
• Replace onChange(of:perform:) 1-parameter variant with 0- or 2-parameter forms.
• Replace excessive fontWeight(...) usage; prefer bold() when appropriate and use Dynamic Type fonts.
• Replace explicit .font(.system(size: ...)) with Dynamic Type fonts; for iOS 26+ consider .font(.body.scaled(by: ...)).

Navigation and tabs

• Replace NavigationView → NavigationStack unless iOS 15 support is required.
• Replace inline destination NavigationLink in lists with navigationDestination(for:) or equivalent.
• Replace legacy tabItem(...) with the new Tab API for type-safe selection and modern tab layouts.

Accessibility and interaction

• Replace onTapGesture with Button unless tap location or tap count is required.
• Replace image-only buttons or Label-only button labels with inline Button("Title", systemImage: ...) when possible.

Data, models, and SwiftData

• Replace ObservableObject → @Observable unless Combine publishers are required.
• Avoid @Attribute(.unique) in SwiftData models when using CloudKit.
• Split view code out of computed properties into dedicated View structs to preserve @Observable invalidation.

Iteration and collections

• Replace ForEach(Array(x.enumerated()), id: \.element.id) → ForEach(x.enumerated(), id: \.element.id).

Files, timing, and rendering

• Replace documents directory boilerplate with URL.documentsDirectory.
• Replace Task.sleep(nanoseconds:) with Task.sleep(for: .seconds(...)).
• Replace UIGraphicsImageRenderer with ImageRenderer for SwiftUI view rendering.

Concurrency and main actor usage

• Remove overuse of DispatchQueue.main.async; prefer structured concurrency and @MainActor where needed.
• Avoid adding @MainActor redundantly for new app templates where main actor isolation is default.

Layout

• Treat GeometryReader as a last resort; prefer containerRelativeFrame() and visualEffect() or other layout APIs.
• Remove unnecessary fixed frames that fight SwiftUI layout.

Numeric formatting

• Replace C-style formatting with format styles, e.g. Text(abs(x), format: .number.precision(.fractionLength(2))).

File organization

• Split large files containing many types to reduce build times and improve navigation.

Output Expectations

• Provide a concise list of fixes applied or recommended.
• Call out any compatibility constraints (iOS version, CloudKit, Combine requirements).
• If the code uses unknown APIs, explicitly request confirmation or docs before proceeding.