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swift-composable-architecture

Implement TCA Features with State, Action, Reducer, and Store patterns.

1|1|Updated Jan 29, 2026
Search Tags:#testing#swift#ios#state-management#reducer#tca#composable-architecture
One-click install
npx skills add https://github.com/KKodiac/agent-skills --skill swift-composable-architecture-kkodiac
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: swift-composable-architecture
Source: https://github.com/KKodiac/agent-skills/tree/main/skills/swift-composable-architecture
Command: npx skills add https://github.com/KKodiac/agent-skills --skill swift-composable-architecture-kkodiac

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

The Composable Architecture (TCA) provides a clean, scalable approach to building iOS/macOS features with unidirectional data flow, making complex UI logic easier to reason about, test, and maintain.

Core Features & Use Cases

  • State as a value type with predictable mutations
  • Actions represent events and effects, reducers evolve state
  • Dependency injection and environment composition for testability
  • Feature composition with Scope and IdentifiedArray to build modular screens and flows
  • Thorough testing with TestStore to verify state transitions and effects

Quick Start

Define a Feature with State and Action, implement a Reducer, connect it to a Store, and write tests with TestStore.

Frequently Asked Questions about swift-composable-architecture

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I manage state in iOS apps using unidirectional data flow?▼

Unidirectional data flow in iOS apps is managed by defining State as a value type, sending Actions to represent events, and using Reducers to evolve state predictably. This architecture makes complex UI logic easier to reason about and test.

What is the best way to test state transitions and effects in Swift reducers?▼

The best way to test Swift reducers is by using a TestStore to verify state transitions and effects. You assert against expected state mutations step-by-step, ensuring your unidirectional data flow logic behaves predictably.

How do I build modular features in Swift with composable architecture?▼

You build modular features in Swift by composing reducers with Scope and managing collections via IdentifiedArray. This approach allows you to build modular screens and flows, enabling scalable feature composition across iOS and macOS apps.

Does composable architecture work for macOS feature development?▼

Yes, composable architecture works for macOS feature development. It applies to both iOS and macOS environments, providing a clean, scalable approach to building features with modular state management and testable logic across platforms.

How do I handle dependency injection in Swift for testable state management?▼

Dependency injection in Swift state management is handled through environment composition. By injecting dependencies into your reducers, you isolate external effects, making your feature logic fully testable and modular across different screens.

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