Maybe you already had the theory of how VIPER Architecture work but that's only the THEORY, in the real work can be painful implement a Software Architecture because you can have a lot of cases that you can't know how to implement correctly accordly VIPER Architecture (But this can happen when whatever Architecture).
I'll explain you how to implement correctly VIPER with a common cases, but if you have an especific scenario you can comment to discuss how VIPER can solvent correctly.
PhonebookApp (iOS)
A classic one. Let's supouse that you need to do a simple Phonebok application where stores contact.
PhonebookApp # Root directory of the application
├── Common # Shared code between features
│ ├── Models # Data models representing entities
│ ├── Contact.swift # Represents a single contact with its information
│ └── ContactGroup.swift # Represents a group of contacts
│ ├── Utils # Utility classes for common functionalities
│ ├── NetworkManager.swift # Handles communication with network services
│ └── StorageManager.swift # Handles data persistence and retrieval
│ └── ViewModels # View models for data presentation
│ ├── ContactDetailViewModel.swift # Prepares data for the contact detail view
│ ├── ContactGroupListViewModel.swift # Prepares data for the contact group list view
│ └── ContactListViewModel.swift # Prepares data for the contact list view
├── Features # Individual features of the application # Feature for managing a single contact
├── ContactDetail
├── Views # UI components for displaying the contact
│ └── ContactDetailView.swift # Xcode Storyboard or SwiftUI view for contact details
├── Interactors # Business logic for contact data
│ └── ContactDetailInteractor.swift # Fetches, updates, and deletes contact data
├── Presenters # Prepares data for the contact detail view
│ └── ContactDetailPresenter.swift # Receives data from interactor and formats it for view
└── Routers # Navigation logic for the contact detail screen
└── ContactDetailRouter.swift # Handles navigation to other features from contact detail # Feature for managing contact groups
├── ContactGroupList
├── Views # UI components for displaying contact groups
│ └── ContactGroupListView.swift # Xcode Storyboard or SwiftUI view for contact group list
├── Interactors # Business logic for contact group data
│ └── ContactGroupListInteractor.swift # Fetches, updates, and manages contact groups
├── Presenters # Prepares data for the contact group list view
│ └── ContactGroupListPresenter.swift # Receives data from interactor and formats it for view
└── Routers # Navigation logic for the contact group list screen
└── ContactGroupListRouter.swift # Handles navigation to other features from contact group list # Feature for managing the list of contacts
└── ContactList
├── Views # UI components for displaying contacts
│ └── ContactListView.swift # Xcode Storyboard or SwiftUI view for contact list
├── Interactors # Business logic for contact data
│ └── ContactListInteractor.swift # Fetches, updates, and manages contacts
├── Presenters # Prepares data for the contact list view
│ └── ContactListPresenter.swift # Receives data from interactor and formats it for view
└── Routers # Navigation logic for the contact list screen
└── ContactListRouter.swift # Handles navigation to other features from contact list
├── App # Entry point and core application logic
│ ├── AppDelegate.swift # Manages the application lifecycle
│ ├── SceneDelegate.swift # Manages window scene lifecycle and transitions on iOS 13+
│ └── MainCoordinator.swift # Coordinates navigation between features
├── Tests # Unit tests for application components
│ ├── CommonTests # Tests for shared code
│ ├── ModelsTests.swift # Unit tests for `Contact` and `ContactGroup` models
│ └── UtilsTests.swift # Unit tests for `NetworkManager` and `StorageManager`
│ ├── FeaturesTests # Tests for individual features
│ ├── ContactDetailTests.swift # Unit tests for contact detail functionality
│ ├── ContactGroupListTests.swift # Unit tests for contact group list functionality
│ └── ContactListTests.swift # Unit tests for contact list functionality
│ └── AppTests # Tests for application entry point
│ └── AppDelegateTests.swift # Unit tests for `AppDelegate`
└── Resources # Assets and configuration files
├── Images.xcassets # App icons and other images
├── LaunchScreen.storyboard # Storyboard for the launch screen
└── Info.plist # Configuration file for the application
Shop App (Android)
ShopApp
├── app
│ ├── build.gradle
│ ├── src
│ ├── main
│ ├── AndroidManifest.xml
│ ├── assets
│ │ └── ... # app assets like images
│ ├── java
│ └── com.yourcompany.shop
│ ├── data
│ ├── model
│ ├── Product.java # Represents a product with details
│ └── ProductCategory.java # Represents a product category
│ ├── network
│ └── ApiManager.java # Handles network communication
│ ├── persistence
│ └── LocalStorage.java # Handles data persistence on device
│ ├── repository
│ └── ProductRepository.java # Provides access to product data
│ ├── features
│ ├── productdetail # Feature for managing a single product detail
│ │ ├── contract
│ │ │ ├── ProductDetailContract.kt # Interface for VIPER communication
│ │ │ ├── ProductDetailView.kt # Interface for View
│ │ │ ├── ProductDetailInteractor.kt # Interface for Interactor
│ │ │ ├── ProductDetailPresenter.kt # Interface for Presenter
│ │ │ └── ProductDetailRouter.kt # Interface for Router
│ │ ├── data
│ │ │ └── ProductDetailRepositoryImpl.kt # Implementation of ProductRepository for product detail
│ │ ├── presentation
│ │ │ ├── ProductDetailPresenterImpl.kt # Implementation of ProductDetailPresenter
│ │ ├── ui
│ │ │ └── ProductDetailActivity.kt # Activity for displaying product details
│ │ └── ... (other implementation classes)
│ ├── productlist # Feature for managing the product list
│ │ ├── contract
│ │ │ ├── ProductListContract.kt # Interface for VIPER communication
│ │ │ ├── ProductListView.kt # Interface for View
│ │ │ ├── ProductListInteractor.kt # Interface for Interactor
│ │ │ ├── ProductListPresenter.kt # Interface for Presenter
│ │ │ └── ProductListRouter.kt # Interface for Router
│ │ ├── data
│ │ │ └── ProductListRepositoryImpl.kt # Implementation of ProductRepository for product list
│ │ ├── presentation
│ │ │ ├── ProductListPresenterImpl.kt # Implementation of ProductListPresenter
│ │ ├── ui
│ │ │ └── ProductListActivity.kt # Activity for displaying product list
│ │ └── ...
│ ├── ...
│ └── util
│ └── ... # Utility classes
│ └── gradle.properties
│ └── gradlew.bat # or gradlew (depending on OS)
├── build.gradle
├── gradle.properties
└── local.properties # Optional for local development configuration
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