TodoApp — iOS Practice Project

A simple Todo application built with Swift and SwiftUI as part of an ongoing effort to refresh and deepen iOS development skills. This is a learning-focused project and should be treated as a practice app, not production-ready software.

Purpose

This project serves as a hands-on exercise to build familiarity with modern iOS development patterns including SwiftUI declarative UI, SwiftData persistence, and the MVVM architecture.

Tech Stack

Technology	Role
Swift 5.9+	Primary language
SwiftUI	Declarative UI framework
SwiftData	Local persistence (iOS 17+)
MVVM	Architecture pattern
Xcode 15+	IDE

Features

• Add and delete todo items
• Mark items as complete with a strikethrough indicator
• Data persisted locally across app launches via SwiftData

Project Structure

TodoApp/
├── TodoAppApp.swift          # App entry point, SwiftData container setup
├── ContentView.swift         # Main screen
├── TodoRowView.swift         # Single todo row component
├── Models/
│   └── TodoItem.swift        # SwiftData model
└── ViewModels/
    └── TodoViewModel.swift   # Business logic and data operations

Architecture

The app follows the MVVM (Model-View-ViewModel) pattern:

• Model — TodoItem is a @Model class managed by SwiftData, acting as the data entity
• ViewModel — TodoViewModel owns the business logic (add, delete, toggle) and exposes state to views via @Observable
• View — SwiftUI views are kept thin, delegating all logic to the ViewModel

Planned Architecture Improvements

As the project evolves, the following patterns are planned:

• Repository layer — abstract data access behind a TodoRepository protocol, decoupling the ViewModel from SwiftData directly.
• Dependency injection — pass dependencies (context, repository) through initializers rather than pulling them from the environment, improving testability and separation of concerns
• Unit tests — test ViewModel logic in isolation using an in-memory SwiftData store

Roadmap

This app is intended to grow as a practice vehicle. Planned additions include:

• Edit todos — tap a row to open a detail view and rename it, introducing NavigationLink and passing data between views
• Filter todos — toggle between All / Active / Completed using @State for selection and Predicate in FetchDescriptor
• @Query macro — replace the manual fetchItems() call with SwiftData's @Query property wrapper for automatic list refresh and cleaner view code

Notes

• Requires iOS 17+ due to SwiftData and @Observable
• This project evolves incrementally — commits reflect learning progression, not finished features

License

This project is licensed under the MIT License. See LICENSE for details.