Agent skill

iOS Architecture

Standards for MVVM, Coordinators, and Clean Architecture (VIP/VIPER).

View SKILL.md on GitHub Repository
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npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/other/other/architecture-hoangnguyen0403-agent-skills-standar

Metadata

Additional technical details for this skill

labels
ios architecture mvvm coordinator vips
triggers 
{
    "files": [
        "**/*ViewModel.swift",
        "**/*Coordinator.swift",
        "**/*ViewController.swift"
    ],
    "keywords": [
        "MVVM",
        "Coordinator",
        "ViewState",
        "Output",
        "Input"
    ]
}

SKILL.md

iOS Architecture Standards

Priority: P0

Implementation Guidelines

MVVM (Model-View-ViewModel)

  • ViewModel Responsibility: Handle business logic, formatting, and state. No UIKit imports (except for platform types like UIImage if strictly necessary).
  • ViewState: Use a single state object or discrete @Published properties for UI updates.
  • Inputs/Outputs: Define explicit protocols or nested types for inputs (events from View) and outputs (state for View).

Coordinator Pattern

  • Navigation Logic: Decouple ViewControllers from navigation logic. The Coordinator handles instantiation and push/present.
  • Dependency Injection: Pass dependencies (Services, Repositories) through the Coordinator into the ViewModels.
  • Child Coordinators: Maintain a hierarchy; remove child coordinators when their flow is finished.

Clean Architecture (VIP/VIPER)

  • VIP (Clean Swift): Use Interactor for logic, Presenter for UI formatting, and ViewController for display.
  • Unidirectional Flow: Data flows: View -> Interactor -> Presenter -> View.

Anti-Patterns

  • Massive View Controller: **No Logic in VC**: Move business logic to ViewModel/Interactor.
  • Violating Encapsulation: **No Public ViewModel State**: Keep state private(set) or using publishers.
  • Direct Navigation: **No self.navigationController?.push(...)**: Use a Coordinator.

References

  • MVVM-C & VIP Implementation

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