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:

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