MVVM in IOS

What does MVVM mean, respectively?

model-Data Layer
viewcontroller/view-Display Layer
viewmodel-Data Model

The difference between MVVM and MVC

First of all, let's simplify the MVC schema pattern diagram:

Mvc.png

In this case, the controller needs to do too much to express the logic, the business logic, so the code is very large. and MVVM:

• MVVM, like MVC, aims to separate the model from the view, but it better separates the representation logic and reduces the controller's burden;
• The model is not introduced in Viewcontroller, and it is unavoidable to deal with the model in controller.

MVVM in IOS