Xcode TCA Template

Overview

This repository provides a TCA (The Composable Architecture) Template for Xcode, making it easy for developers to scaffold projects with TCA support quickly. The template is pre-configured to take advantage of the latest TCA and SwiftUI features, allowing for more structured and maintainable Swift apps.

TCA Architecture

The Composable Architecture is a library for building modular, predictable, and testable applications. Below is a visual representation of its architecture:

Compatibility

This template is compatible with the following:

• TCA Version: Designed to work with TCA 1.15.0, which includes the new Reducer Macro.
• Swift Version: Requires Swift 5.9 or higher.
• Xcode Version: Tested with Xcode 16.0 RC.

Installation Instructions

Follow the steps below to install the Xcode TCA template:

1. Download the Repository

• Either download the repository directly or clone it using Git.

2. Navigate to Xcode's File Templates Directory

• In your terminal, run the following command to go to the correct directory where Xcode expects to find templates:

  cd ~/Library/Developer/Xcode/Templates/File\ Templates/

  (Note: If this directory does not exist, create it manually using Finder or mkdir in the terminal.)

3. Add the Template

• Copy and paste the Feature.xctemplate folder from the downloaded repository into this directory:

  ~/Library/Developer/Xcode/Templates/File\ Templates/Feature.xctemplate/

4. Use the Template in Xcode

• Open Xcode, start a new project, and when you add a new file, the Feature template should be available in the options.

Folder Structure

Let's walk through an example of using this template. Imagine you're adding a feature called AddItem using this template. The resulting folder structure would look like this:

AddItem/
├── AddItemFeature.swift
├── AddItemView.swift

In this example, two key files are created:

• AddItemFeature.swift: This file contains the Reducer logic, handling state and actions related to the feature.
• AddItemView.swift: This file defines the SwiftUI View for the feature, linking user interactions to the state and actions in AddItemFeature.

This structure helps keep your code organized and modular, ensuring separation of concerns between the business logic and the user interface.

Code Breakdown

AddItemFeature.swift

This file contains the logic for managing the state and actions of the AddItem feature. Here's the complete code:

import ComposableArchitecture
import Foundation

@Reducer
public struct AddItemFeature {
    @ObservableState public struct State: Equatable {
        public var title = "AddItem"
    }

    public enum Action: Equatable {
        case setTitle(String)
        case onAppear
    }

    public var body: some Reducer<State, Action> {
        Reduce { state, action in
            switch action {
            case let .setTitle(title):
                state.title = title
                return .none

            case .onAppear:
                return .none
            }
        }
    }
}

AddItemView.swift

This file defines the user interface and connects it to the feature's state and actions using SwiftUI:

import ComposableArchitecture
import SwiftUI

struct AddItemView: View {
    @Bindable var store: StoreOf<AddItemFeature>

    var body: some View {
        Form {
            Text("Hello World")
        }
        .navigationTitle(Text(store.title))
        .onAppear {
            store.send(.onAppear)
        }
    }
}

#if DEBUG

    #Preview {
        @Previewable var store: StoreOf<AddItemFeature> = .init(
            initialState: AddItemFeature.State()
        ) {
            AddItemFeature()
        }

        NavigationStack {
            AddItemView(store: store)
        }
    }

#endif

How This Template Helps You

By using this template, you get a boilerplate setup for TCA-based development. It includes a ready-to-use Reducer and a SwiftUI View. This speeds up the process of setting up new features in your app and ensures your architecture stays modular, testable, and maintainable.

Feedback

Feel free to try out the template and share any feedback or issues you may encounter!

References

• The Composable Architecture
• Pointfree
• Xcode Project and File Templates