Skillshub ios-swiftui

Standards for declarative UI construction and data flow 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/ComeOnOliver/skillshub

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

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

manifest: skills/HoangNguyen0403/agent-skills-standard/ios-swiftui/SKILL.md

source content

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

SwiftUI Views & State