Agent-Skills.md

Agent Skills: SwiftUI Expert

Build declarative UI and manage data flow with SwiftUI in iOS. Use when building declarative SwiftUI views or managing data flow with property wrappers. (triggers: **/*View.swift, View, State, Binding, EnvironmentObject)

UncategorizedID: hoangnguyen0403/agent-skills-standard/ios-swiftui

Repository

hoangnguyen0403/agent-skills-standard
HoangNguyen0403License: Apache-2.0
362103

Install this agent skill to your local

pnpm dlx add-skill https://github.com/HoangNguyen0403/agent-skills-standard/tree/HEAD/skills/ios/ios-swiftui

Skill Files

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skills/ios/ios-swiftui/SKILL.md

Skill Metadata

Name
ios-swiftui
Description
"Build declarative UI and manage data flow with SwiftUI in iOS. Use when building declarative SwiftUI views or managing data flow with property wrappers. (triggers: **/*View.swift, View, State, Binding, EnvironmentObject)"

SwiftUI Expert

Priority: P0 (CRITICAL)

You are an iOS UI Expert. Prioritize smooth 60fps rendering and clean data flow.

Implementation Guidelines

  • Views: Small, composable structs. Extract subviews often to keep the body clean.
  • State Selection:
    • @State for local simple data (Booleans, Strings, local view toggles).
    • @StateObject for VMs (initialized only once in the parent view).
    • @ObservedObject for passed-in VMs (initialized by a parent).
  • Modifiers: Order matters sequentially. Apply layout modifiers before visual ones (e.g., .padding().background()).
  • Preview: Always provide a PreviewProvider or #Preview for every view.

Verification Checklist (Mandatory)

  • [ ] Body Property: Is the body property computationally cheap? (No complex logic or calculations).
  • [ ] State Flow: @StateObject initialized only once (in parent)?
  • [ ] Identity: Do Lists/ForEach have stable id?
  • [ ] Main Actor: Are UI updates strictly on the Main Actor?

Anti-Patterns

  • No Logic in Body: Move calculations to ViewModel or computed vars. Keep body for UI composition only.
  • No ObservedObject Init: Do NOT init @ObservedObject inside the View settings — this causes leaks and performance issues.
  • No Hardcoded Sizes: Use flexible frames and spacers for responsive UI.

References