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MVVM-C based iOS-Architecture Reference

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// repository documentation

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# Eris

Name `Eris` is inspired from [here](https://solarsystem.nasa.gov/planets/dwarf-planets/eris)

## Architecture

Architecture is divided in the following independently injectable and testable layers.

![Diagram](https://github.com/NasirMalik/Eris/blob/main/mvvm_architecture.png)

Layers are defined here.

### Coordinator
Application Screenflow and later Push Routing handler.
### View
Display of data. Data is being displayed in the form of Models and views confrom to ModelConfigurable to populate data via `configure(model:)` method
### ViewController
Controller contains logic of view's state representation and pass actions to viewModel
### ViewModel
- ViewModel does all the business logic implementation with or without help of mappers.
- Also it informs view-controller about the state update via `bindings`. 
- Mapper are the `Domain Usecases`. Any domain logic will be injected in the form of independently tested usecases. Idea is to keep `Domain-Layer` independent from ViewModels thus can be `widely reuseable`. Current implementation doesn't contain any domain logic thus doesn't contain any mapper.
### Repository
Its an `abstraction layer` between `ViewModel` and `Data Stores` that encapuslates Data-source layer. Currently there are two data sources, Network and CoreData. This layer can encapulate further data sources aswel i-e Remote Configurations etc
### Interactor
Network: Its a wrapper written on top of Swift Package `Ceres` which fetch and decode data into inferred model object. 
### Persistor
CoreData: Persistor encapsulates CoreData and fetches and updates data.
        
## Considerations

Following are few considerations while writing code

- Code is following `MVVM-C` Architecture. 
- Every layer is interfaced via `dependency management` and lays foundation for high level DI-Framework
- Code is `testable` and mocks can easily replaced with original objects
- Code is following `iOS Swift Style Guidelines` and have same styling throughtout the code. 
- Project is structured to `scale` as big as it can be 
- `Folder structure` is highligting the architecture   
- Network is implemented as an independent `Module (Swift Package)`
- Layers are interfaced together via `Protocols`
- Dependency resolution is being done via Factory.

## Testing Notes
- `NWPath.Status` doesn't return `.satisfied` on simulator so for getting best results please test on device.

## Notes
A detailed article was published on Medium and can be found [here](https://naxirmahmood.medium.com/ios-application-architecture-7607b367811d)

Eris

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