Agent-skills-standard swift-swiftui

Configure 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)

install

source · Clone the upstream repo

git clone https://github.com/HoangNguyen0403/agent-skills-standard

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/HoangNguyen0403/agent-skills-standard "$T" && mkdir -p ~/.claude/skills && cp -r "$T/skills/swift/swift-swiftui" ~/.claude/skills/hoangnguyen0403-agent-skills-standard-swift-swiftui && rm -rf "$T"

manifest: skills/swift/swift-swiftui/SKILL.md

source content

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

State & Binding