Dev Skill

Generate SwiftUI iOS application code from PRD documents. Use when a PRD document is available and needs to be transformed into a working iOS application with proper architecture, UI components, and data management. This skill receives input from prd-skill and automatically triggers qa-skill after code generation.

Dev Skill - SwiftUI iOS Development Generator

Overview

This skill transforms Product Requirements Documents (PRD) into fully functional SwiftUI iOS applications. It analyzes PRD requirements and generates production-ready code with proper architecture, UI components, data models, and business logic.

Architecture Pattern

MVVM Architecture

All generated code follows the Model-View-ViewModel pattern:

Model Layer

• Data models (structs conforming to Codable)
• Data persistence (Core Data or SwiftData)
• Network layer (URLSession or Alamofire)

ViewModel Layer

• Business logic and state management
• Data transformation and validation
• Service coordination

View Layer

• SwiftUI views with proper componentization
• Navigation stack management
• UI state binding

Code Generation Workflow

1. PRD Analysis

• Parse PRD document for functional requirements
• Extract screen specifications and user flows
• Identify data models and relationships
• Determine required third-party integrations

2. Project Structure Generation

Create a complete Xcode project with:

ProjectName/
├── ProjectName.xcodeproj
├── ProjectName/
│   ├── Models/
│   │   ├── DataModel.swift
│   │   └── APIModels.swift
│   ├── ViewModels/
│   │   ├── MainViewModel.swift
│   │   └── [Feature]ViewModel.swift
│   ├── Views/
│   │   ├── ContentView.swift
│   │   ├── [Feature]View.swift
│   │   └── Components/
│   │       ├── ButtonStyles.swift
│   │       └── CustomViews.swift
│   ├── Services/
│   │   ├── APIService.swift
│   │   └── DataService.swift
│   └── Utilities/
│       ├── Extensions.swift
│       └── Constants.swift
└── ProjectNameTests/
    └── [Feature]Tests.swift

3. Core Components Generation

3.1 Data Models

struct Task: Identifiable, Codable {
    let id: UUID
    var title: String
    var isCompleted: Bool
    var dueDate: Date?
    var category: String
    var priority: Priority
}

enum Priority: String, Codable, CaseIterable {
    case low, medium, high
}

3.2 ViewModels

class TaskViewModel: ObservableObject {
    @Published var tasks: [Task] = []
    @Published var selectedCategory: String?
    
    private let dataService: DataService
    
    init(dataService: DataService = .shared) {
        self.dataService = dataService
        loadTasks()
    }
    
    func addTask(_ task: Task) { ... }
    func deleteTask(_ task: Task) { ... }
    func toggleCompletion(_ task: Task) { ... }
}

3.3 SwiftUI Views

struct TaskListView: View {
    @StateObject private var viewModel = TaskViewModel()
    @State private var showingAddTask = false
    
    var body: some View {
        NavigationView {
            List {
                ForEach(viewModel.tasks) { task in
                    TaskRowView(task: task)
                }
                .onDelete(perform: deleteTask)
            }
            .navigationTitle("Tasks")
            .toolbar {
                Button(action: { showingAddTask = true }) {
                    Image(systemName: "plus")
                }
            }
            .sheet(isPresented: $showingAddTask) {
                AddTaskView()
            }
        }
    }
}

4. Feature Implementation

4.1 Navigation

• TabView for main navigation
• NavigationStack for hierarchical navigation
• Sheet presentations for modal views

4.2 Data Persistence

• Core Data for complex relationships
• @AppStorage for simple preferences
• FileManager for document storage

4.3 Networking

• Async/Await for modern API calls
• Error handling with Result type
• JSON decoding with Codable

4.4 UI/UX

• Adaptive layout for all device sizes
• Dark mode support
• Accessibility features
• Haptic feedback

Example: Todo App from PRD

PRD Input: Todo app with categories, reminders, sharing

Generated Code:

1. Models: Task, Category, Reminder
2. ViewModels: TaskListViewModel, CategoryViewModel
3. Views: TaskListView, CategoryView, AddTaskView, SettingsView
4. Services: NotificationService, SharingService
5. Features:
   • Push notifications for reminders
   • Share sheet integration
   • iCloud sync for data
   • Widgets for quick access

Auto-Trigger Next Steps

After generating the iOS project, this skill automatically:

1. Creates a complete Xcode project in dev-output/ directory
2. Verifies code compiles without errors
3. Triggers qa-skill with the generated code as input
4. Provides build instructions and next steps

Integration Requirements

Input Format

• PRD markdown document from prd-skill
• Structured requirements with priorities
• Technical specifications and constraints

Output Validation

• All code must compile in Xcode 15+
• Follows SwiftUI best practices
• Includes proper error handling
• Supports iOS 16+ deployment target

Quality Standards

• 100% SwiftUI (no UIKit unless absolutely necessary)
• Proper separation of concerns
• Comprehensive documentation
• Follows Apple's Human Interface Guidelines