A sample app to demonstrate MVVM implementation in iOS

MVVM architecture

MVVM (Model-View-ViewModel) is derived from MVC(Model-View-Controller). It is introduced to solve existing problems of Cocoa's MVC architecture in iOS world. One of its feature is to make a better seperation of concerns so that it is easier to maintain and extend.

• Model: It is simillar to model layer in MVC (contains data business logic)
• View: UIViews + UIViewControllers (We treat both layout view and controllers as View)
• ViewModel: A mediator to glue two above layer together.

An important point in MVVM is that it uses a binder as communication tool between View and ViewModel layers. A technique named Data Binding is used.

Sample

A simple app which shows the most stared Github repositories written by Swift.

Libraries

• Alamofire to perform HTTP requests under Model layer.
• RxSwift + RxCocoa to do "data binding" job which binds ViewModel and View
• SwiftyJSON to parse API response data
• Realm to persit local data