Does this skill require a full application rewrite?

No, it specifically advocates for the Strangler pattern, allowing you to migrate your codebase screen-by-screen while keeping the existing application functional.

How does it help with Massive ViewControllers?

It provides a clear path to extract networking to Workers, formatting to Presenters, and business logic to Interactors, leaving the ViewController to handle only UI display.

What is VIP+W architecture in iOS?

VIP+W is an architectural pattern (View-Interactor-Presenter + Worker) that extends Clean Architecture principles to ensure complete separation of concerns between UI, business logic, and data fetching.

Does it include testing strategies?

Yes, the guide emphasizes writing characterization tests for legacy code before refactoring to ensure that existing behavior is preserved during the migration.

Is this migration guide suitable for SwiftUI?

While the specific code examples focus on UIKit and pure UIKit patterns, the architectural principles of VIP+W can be adapted for SwiftUI-based modularity.

iOS Legacy Migration Guide

Name: iOS Legacy Migration Guide
Author: arimunandar

byarimunandar

0•

Mobile Development

Transforms legacy iOS MVC code into testable VIP+W Clean Architecture through systematic, step-by-step refactoring.

This skill provides a structured methodology for modernizing legacy iOS codebases by refactoring 'Massive ViewControllers' and spaghetti code into the VIP+W (View-Interactor-Presenter + Worker) Clean Architecture pattern. It guides developers through the entire lifecycle of a migration—from initial analysis and characterization testing to the incremental extraction of logic into specialized components. By following the Strangler pattern, this skill ensures that your application remains functional and stable while you systematically improve its maintainability, testability, and separation of concerns.

주요 기능

01Standardized protocol and file structure generation

02Systematic decomposition of Massive ViewControllers

030 GitHub stars

04VIP+W component extraction (Interactor, Presenter, Worker, Router)

05Characterization test implementation for legacy behavior preservation

06Incremental migration workflows using the Strangler pattern

사용 사례

01Refactoring bloated MVC iOS applications to modern Clean Architecture

02Improving unit test coverage by decoupling UI from business logic

03Onboarding teams to standardized VIP+W implementation patterns

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add arimunandar/claude-code-ios-plugin legacy-migration

For use in Claude.ai and ChatGPT

Download Skill