What is the role of the MVVM framework in iOS?

The purpose of the MVVM framework in iOS is to assist developers in better separating the business logic and view logic of the application, making the code more maintainable, testable, and improving development efficiency.

In specific terms, the roles of the MVVM framework include the following aspects:

1. Separating view and view logic: The MVVM framework binds views to view models through data binding mechanisms, separating the display and user interaction logic of the view from the view model. This allows developers to focus on implementing the business logic of the view model without concerning themselves with the specific implementation details of the view.
2. Providing testability: View models encapsulate most of the application’s business logic, making it easier to conduct unit tests by separating this logic from the views, without relying on specific view implementations.
3. Decreasing coupling: The MVVM framework achieves decoupling of the view and view model through data binding mechanism, allowing them to evolve independently. This means that when the view requirements change, we only need to update the corresponding view model without affecting other parts of the code. Similarly, when business logic changes, we only need to update the view model without impacting the view implementation.
4. Improve code reusability: The MVVM framework encapsulates view models, allowing us to package common business logic into reusable modules. This way, during development, we can directly use these modules without having to write the same code repeatedly.

In short, the purpose of the MVVM framework is to assist developers in better organizing and managing the code of iOS applications, thereby improving development efficiency, maintainability, and testability.