Agent-Skills.md

Agent Skills: SwiftUI Standards

Manage SwiftUI State, View Lifecycle, and Property Wrappers correctly. Use when managing SwiftUI state, view lifecycle, or property wrappers like @State and @Binding. (triggers: **/*.swift, @State, @Binding, @ObservedObject, View, body)

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

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skills/swift/swift-swiftui/SKILL.md

Skill Metadata

Name
swift-swiftui
Description
Configure SwiftUI state, view lifecycle, and Property Wrappers correctly. Use when managing SwiftUI state, view lifecycle, or property wrappers like @State and @Binding.

SwiftUI Standards

Priority: P0

Implementation Guidelines

State Management

  • @State: @State for data owned by view (e.g., toggle, text input). Private.
  • @Binding: @Binding for data passed down from parent to child. Two-way.
  • @ObservedObject: @ObservedObject when receiving instance from external source.
  • @StateObject: @StateObject when the view is creating the object instance — view owns lifecycle.
  • @EnvironmentObject: @EnvironmentObject to inject data into the view's hierarchy via .environmentObject(). Shared across view hierarchy.

View Composition

  • Extract Subviews: Views < 200 lines. Extract reusable components.
  • View Modifiers: Chain modifiers for styling (.font(), .padding()).
  • Custom Modifiers: Create ViewModifier for reusable styles.

Performance

  • Avoid Heavy Computation: Use @State + .task() for async work.
  • Equatable: Conform views to Equatable to prevent unnecessary re-renders.
  • LazyStacks: LazyVStack/LazyHStack when displaying large number of views in scrolling container to load them only as they appear.

Anti-Patterns

  • No @ObservedObject for owned objects: Use @StateObject.
  • No logic in body: Move to computed properties or methods.
  • No ! in View: Use if-let or nil coalescing.

References