Ios Swift Patterns Agent Skill

by cosmicstack-labs

SwiftUI, UIKit, MVVM, Combine, async/await, Core Data, and App Store submission patterns

447 tokens

context cost

the whole folder, loaded on every use

files

instructions only

copies elsewhere

how many repositories repackaged it

365

stars on the repo

on the repository, not the skill itself

Install

one command, takes just this skill from the repository

npx skills add https://github.com/cosmicstack-labs/mercury-agent-skills --skill ios-swift-patterns

The instruction itself

8 sections, as written by the author

iOS Swift Patterns

Production-grade iOS development with Swift, SwiftUI, and UIKit.

Architecture

MVVM + Coordinator Pattern

View (SwiftUI/UIViewController)
  ↕ binds to
ViewModel (ObservableObject)
  ↕ calls
Service Layer (Networking, DB)
  ↕
Core Data / API

Key Principles

Views are dumb: They render state and forward actions — no business logic
ViewModels own state: @Published properties, @State only for local UI
Services are stateless: Network calls, DB operations, analytics
Coordinators handle navigation: Removing navigation from views makes them reusable

SwiftUI Best Practices

Performance

Use LazyVStack/LazyHStack for large lists, not VStack
Mark views with @MainActor explicitly
Use equatable() on complex views to prevent unnecessary re-renders
Prefer @State for local, @StateObject for owned, @ObservedObject for passed-in

State Management

// Good: Clear separation
@MainActor
class UserViewModel: ObservableObject {
    @Published var users: [User] = []
    @Published var isLoading = false

    func loadUsers() async {
        isLoading = true
        users = await userService.fetchUsers()
        isLoading = false
    }
}

App Store Submission Checklist

[ ] No Hardcoded API keys
[ ] TestFlight beta tested with real users
[ ] Privacy manifest updated
[ ] Screenshots for all required sizes
[ ] App Store description and keywords ready
[ ] Subscription/IAP products configured

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How to use it

Copy the folder

Take cosmicstack-labs/ios-swift-patterns from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

The agent identifies a skill by the name field in its header. Two skills with the same name cannot sit side by side — one of them will be ignored.