VIP Clean Architecture

Overview

VIP (View-Interactor-Presenter) is Uncle Bob's Clean Architecture applied to iOS with strict unidirectional data flow. Unlike MVVM (bidirectional) or VIPER (complex 5-component), VIP uses 3 core components with protocol-based boundaries.

Core Principle: Data flows in one direction: View → Interactor → Presenter → View. No component ever calls backward in the cycle.

When to Use VIP

digraph vip_decision {
    "Enterprise app?" [shape=diamond];
    "Max testability?" [shape=diamond];
    "Complex business logic?" [shape=diamond];
    "Team > 3 devs?" [shape=diamond];
    "Use VIP" [shape=box, style=filled, fillcolor=lightgreen];
    "Use MVVM" [shape=box, style=filled, fillcolor=lightblue];