Agent-skills-standard ios-swiftui

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)

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 "$T/skills/ios/ios-swiftui" ~/.claude/skills/hoangnguyen0403-agent-skills-standard-ios-swiftui && rm -rf "$T"

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

source content

SwiftUI Expert

Priority: P0 (CRITICAL)

Role: iOS UI Expert. Prioritize smooth 60fps, clean data flow.

Implementation Guidelines

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

Verification Checklist (Mandatory)

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

Anti-Patterns

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