ToDoList

A modern TODO app built with SwiftUI using MVVM architecture and Repository Pattern.

The project is based on SwiftData for persistence and uses modern iOS 17+ APIs including Observation and Swift Concurrency (async/await, structured concurrency).

It focuses on clean architecture, separation of concerns, and scalable state management between UI, domain logic, and data layer.

Demonstration

todolist_demo.MOV

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✨ Features

• ➕ Create tasks
• ✏️ Edit tasks
• 🗑 Delete tasks
• ✅ Mark tasks as completed
• 📝 Add additional information/details to tasks
• 🔍 Filter tasks by:
  • All
  • Completed
  • Uncompleted

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🧠 Data Flow & Architecture

The app uses MVVM (Model–View–ViewModel):

SQLite via SwiftData → ModelContext → TaskRepository → ViewModel → Views

• SwiftData handles persistence in SQLite
• ModelContext performs CRUD operations
• TaskRepository wraps data access logic
• ViewModel is injected via DI and manages state and business logic
• Views only render state and trigger actions via closures and properties

🛠️ App setup and lifecycle

• AppContainer builds the full dependency graph

• Configures ModelContainer

• Creates TaskRepository and ViewModel

• @main creates AppContainer and injects it into RootView

• RootView stores ViewModel in @State and controls its lifecycle with onAppear and onDisappear

• UI communicates with ViewModel via properties and closures with no tight coupling

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🗄 Data Storage — SwiftData (Key Feature)

SwiftData is used as the main persistence layer:

• @Model for defining persistent entities
• @ModelActor for safe concurrent data access
• ModelContainer configuration is centralized in AppContainer
• ModelContext is used internally for data operations

SwiftData enables:

• declarative data modeling
• thread-safe operations with actors
• clean separation between storage and business logic
• simplified CRUD without manual persistence handling

SwiftData is the primary and sole storage mechanism in this application