SKILL.md
iOS Swift Development
Table of Contents
- [Overview](#overview)
- [When to Use](#when-to-use)
- [Quick Start](#quick-start)
- [Reference Guides](#reference-guides)
- [Best Practices](#best-practices)
Overview
Build high-performance native iOS applications using Swift with modern frameworks including SwiftUI, Combine, and async/await patterns.
When to Use
- Creating native iOS applications with optimal performance
- Leveraging iOS-specific features and APIs
- Building apps that require tight hardware integration
- Using SwiftUI for declarative UI development
- Implementing complex animations and transitions
Quick Start
Minimal working example:
import Foundation
import Combine
struct User: Codable, Identifiable {
let id: UUID
var name: String
var email: String
}
class UserViewModel: ObservableObject {
@Published var user: User?
@Published var isLoading = false
@Published var errorMessage: String?
private let networkService: NetworkService
init(networkService: NetworkService = .shared) {
self.networkService = networkService
}
@MainActor
func fetchUser(id: UUID) async {
isLoading = true
errorMessage = nil
// ... (see reference guides for full implementation)Reference Guides
Detailed implementations in the references/ directory:
Guide
Contents
MVVM Architecture Setup
Network Service with URLSession
Network Service with URLSession
SwiftUI Views
Best Practices
✅ DO
- Use SwiftUI for modern UI development
- Implement MVVM architecture
- Use async/await patterns
- Store sensitive data in Keychain
- Handle errors gracefully
- Use @StateObject for ViewModels
- Validate API responses properly
- Implement Core Data for persistence
- Test on multiple iOS versions
- Use dependency injection
- Follow Swift style guidelines
❌ DON'T
- Store tokens in UserDefaults
- Make network calls on main thread
- Use deprecated UIKit patterns
- Ignore memory leaks
- Skip error handling
- Use force unwrapping (!)
- Store passwords in code
- Ignore accessibility
- Deploy untested code
- Use hardcoded API URLs