swiftui-pro

Original：🇺🇸 English
Translated

Comprehensively reviews SwiftUI code for best practices on modern APIs, maintainability, and performance. Use when reading, writing, or reviewing SwiftUI projects.

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Sourcetwostraws/swiftui-agent-skill
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NPX Install

npx skill4agent add twostraws/swiftui-agent-skill swiftui-pro

Tags

Translated version includes tags in frontmatter
swiftui-code-reviewmodern-swift-apiios-app-developmentcode-maintainabilityperformance-optimization

SKILL.md Content

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Review Swift and SwiftUI code for correctness, modern API usage, and adherence to project conventions. Report only genuine problems - do not nitpick or invent issues.
Review process:
  1. Check for deprecated API using 
    references/api.md
    .
  2. Check that views, modifiers, and animations have been written optimally using 
    references/views.md
    .
  3. Validate that data flow is configured correctly using 
    references/data.md
    .
  4. Ensure navigation is updated and performant using 
    references/navigation.md
    .
  5. Ensure the code uses designs that are accessible and compliant with Apple’s Human Interface Guidelines using 
    references/design.md
    .
  6. Validate accessibility compliance including Dynamic Type, VoiceOver, and Reduce Motion using 
    references/accessibility.md
    .
  7. Ensure the code is able to run efficiently using 
    references/performance.md
    .
  8. Quick validation of Swift code using 
    references/swift.md
    .
  9. Final code hygiene check using 
    references/hygiene.md
    .
If doing a partial review, load only the relevant reference files.

Core Instructions

  • iOS 26 exists, and is the default deployment target for new apps.
  • Target Swift 6.2 or later, using modern Swift concurrency.
  • As a SwiftUI developer, the user will want to avoid UIKit unless requested.
  • Do not introduce third-party frameworks without asking first.
  • Break different types up into different Swift files rather than placing multiple structs, classes, or enums into a single file.
  • Use a consistent project structure, with folder layout determined by app features.

Output Format

Organize findings by file. For each issue:
  1. State the file and relevant line(s).
  2. Name the rule being violated (e.g., "Use 
    foregroundStyle()
    instead of 
    foregroundColor()
    ").
  3. Show a brief before/after code fix.
Skip files with no issues. End with a prioritized summary of the most impactful changes to make first.
Example output:

ContentView.swift

Line 12: Use 
foregroundStyle()
instead of 
foregroundColor()
.
swift
// Before
Text("Hello").foregroundColor(.red)

// After
Text("Hello").foregroundStyle(.red)
Line 24: Icon-only button is bad for VoiceOver - add a text label.
swift
// Before
Button(action: addUser) {
    Image(systemName: "plus")
}

// After
Button("Add User", systemImage: "plus", action: addUser)
Line 31: Avoid 
Binding(get:set:)
in view body - use 
@State
with 
onChange()
instead.
swift
// Before
TextField("Username", text: Binding(
    get: { model.username },
    set: { model.username = $0; model.save() }
))

// After
TextField("Username", text: $model.username)
    .onChange(of: model.username) {
        model.save()
    }

Summary

  1. Accessibility (high): The add button on line 24 is invisible to VoiceOver.
  2. Deprecated API (medium): 
    foregroundColor()
    on line 12 should be 
    foregroundStyle()
    .
  3. Data flow (medium): The manual binding on line 31 is fragile and harder to maintain.
End of example.

References

  • references/accessibility.md
    - Dynamic Type, VoiceOver, Reduce Motion, and other accessibility requirements.
  • references/api.md
    - updating code for modern API, and the deprecated code it replaces.
  • references/design.md
    - guidance for building accessible apps that meet Apple’s Human Interface Guidelines.
  • references/hygiene.md
    - making code compile cleanly and be maintainable in the long term.
  • references/navigation.md
    - navigation using 
    NavigationStack
    /
    NavigationSplitView
    , plus alerts, confirmation dialogs, and sheets.
  • references/performance.md
    - optimizing SwiftUI code for maximum performance.
  • references/data.md
    - data flow, shared state, and property wrappers.
  • references/swift.md
    - tips on writing modern Swift code, including using Swift Concurrency effectively.
  • references/views.md
    - view structure, composition, and animation.