ios-swift-development

SKILL.md

iOS Swift Development

Table of Contents

Overview

When to Use

Quick Start

Reference Guides

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
MVVM Architecture Setup

Network Service with URLSession
Network Service with URLSession

SwiftUI Views
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

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