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Legacy to VIP+W Migration

Migrate legacy iOS codebases to VIP+W Clean Architecture screen by screen.

1|1|Updated Feb 4, 2026
Search Tags:#architecture#iOS#refactor#tests-first#legacy-migration#migration-plan#VIP+W
One-click install
npx skills add https://github.com/arimunandar/claude-code-ios-plugin --skill legacy-to-vip-w-migration
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: Legacy to VIP+W Migration
Source: https://github.com/arimunandar/claude-code-ios-plugin/tree/main/skills/legacy-migration
Command: npx skills add https://github.com/arimunandar/claude-code-ios-plugin --skill legacy-to-vip-w-migration

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill provides a structured, step-by-step migration approach to convert legacy iOS codebases (MVC, Massive ViewController, spaghetti code) into VIP+W Clean Architecture, reducing risk and preserving behavior.

Core Features & Use Cases

  • Phase-based migration: Analysis, Extraction, Interactor, Presenter, and Router phases with explicit artifacts.
  • Per-screen plan: Document current responsibilities, create VIP+W file structure, and define protocols and data flow.
  • Real-world workflow: Migrate one screen at a time, validate with tests, and integrate back into the app.

Quick Start

Begin with a current-state assessment for a single screen, draft a migration plan, create VIP+W components, and configure a simple integration test to verify behavior.

Frequently Asked Questions about Legacy to VIP+W Migration

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

FAQPage Schema
How do I migrate a legacy iOS app from MVC to VIP+W architecture?▼

Migrate legacy iOS apps to VIP+W architecture using a phased, screen-by-screen refactoring approach. Extract Worker, Presenter, and Interactor components, then wire them through a Configurator and Router to transform Massive ViewControllers into clean structures.

What is the best way to refactor spaghetti iOS code without breaking existing behavior?▼

Refactor spaghetti iOS code without breaking behavior by using the Strangler pattern alongside a tests-first strategy. Document current screen responsibilities, migrate one screen at a time, and validate each phase with integration tests before moving forward.

How does the Strangler pattern work for iOS Clean Architecture migration?▼

The Strangler pattern works for iOS Clean Architecture migration by incrementally replacing legacy MVC screens with new VIP+W components. You assess current state, extract components, and wire them through a Configurator and Router, validating behavior with tests before full integration.

Can I use a tests-first strategy to migrate one iOS screen at a time to VIP+W?▼

Yes, you can use a tests-first strategy to migrate one iOS screen at a time to VIP+W. Document current behavior, create the VIP+W file structure, extract components, and configure a simple integration test to verify behavior before integrating the screen back into the app.

When do I need to create a Configurator and Router during an iOS VIP+W migration?▼

Create a Configurator and Router during the iOS VIP+W migration after extracting your Interactor, Presenter, and Worker components. They are required to properly wire the VIP+W data flow and integrate the newly refactored screen back into the application architecture.

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