Ios SwiftuiSAFE

A collection of Agent Skills Standard and Best Practice for Programming Languages, Frameworks that help our AI Agent follow best practies on frameworks and programming laguages

The instruction file, verbatim from the audited commit — this is the text the model reads, and the surface the audit's instruction layer examines. Quoted here so you can judge it without cloning anything.

---
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.
metadata:
  triggers:
    files:
    - '**/*View.swift'
    keywords:
    - View
    - SwiftUI @State
    - SwiftUI State
    - Binding
    - EnvironmentObject
---
# 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 (iOS 17+, default)**:
 - **@State for local simple data** (Booleans, Strings, local view toggles).
 - **@State for VMs marked `@Observable`** (owning parent creates it once: `@State private var vm = MyViewModel()`).
 - **Plain `let`/property for passed-in `@Observable` VMs** — no wrapper needed, child views auto-track only the fields they read.
- **Legacy (pre-iOS 17 or Combine `ObservableObject` VMs)**:
 - **@StateObject for VMs** (initialized only once in parent view).
 - **@ObservedObject for passed-in VMs** (initialized by parent).
 - Prefer migrating `ObservableObject` VMs to `@Observable` when the deployment target allows it — see [ios-state-management](../ios-state-management/SKILL.md).
- **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**: `@State`/`@StateObject` VM 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 New `ObservableObject` VMs on iOS 17+**: Use `@Observable` for new code; reserve `ObservableObject`/`@Published` for code that must support pre-17 or already depends on Combine operators.
- **No Hardcoded Sizes**: Use flexible frames and spacers for responsive UI.

## Canonical response anchors

When this skill applies, preserve the following domain terminology or equivalent concrete examples in the answer when relevant:
- @State for local simple data

SAFEgrade B · trust 89/100 Nothing in the source contradicts what it says it does. Grade A is reserved for packages that have also passed the behavioural sandbox.

What the source does

Filesystem

none-observed

Network

none-observed

Shell

none-observed

Dependencies

pinned

Secrets in source

none-found

Findings (0)

No findings outside the package's declared scope.

Gates applied: no_behavioural_pass.