There are a plenty of posts on the internet about app architectures in the iOS development world. Today I will show some tips for using MVVM architecture while developing iOS apps. I am not going to show other architectures if you need them there is a great post (https://medium.com/ios-os-x-development/ios-architecture-patterns-ecba4c38de52 ).



Why MVVM?

The main problem of Apple MVC is mixed responsibility, which leads to the appearance of some kinds of problems such as Massive-View-Controller.



We should accept that UIViewController is the main component in Apple's iOS SDK and all the actions are started and built across this entity. Despite the name, it is more View than a Classic Controller (or Presenter) from MVC( or MVP), because of callbacks like viewDidLoad, viewWillLayoutSubviews, and other view related methods. That is the reason why we should ignore the Controller keyword in the name and use it as View, where the role of real Controller takes the ViewModel.





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