MVVM separates the components of an application into three distinct entities: the Model, the View, and the ViewModel. Let's break down the responsibilities of each:

1. Model:
2. The Model represents the data and business logic of our application. It encapsulates the state and behavior of the entities we are working with. In the context of iOS development, a Model could represent data fetched from an API, a database, or any other source.
3. View:
4. The View is responsible for presenting the user interface (UI) to the user. It includes everything the user sees and interacts with on the screen. In Swift, Views are typically implemented using UIKit or SwiftUI, depending on the target platform and your preference.
5. ViewModel:
6. The ViewModel acts as a mediator between the Model and the View. It holds the application's state and business logic related to the presentation of data. It exposes properties and methods that the View can bind to, allowing it to update its appearance based on changes in the ViewModel. The ViewModel also interacts with the Model to fetch or update data as needed.

To implement MVVM in Swift

Define your Model: Identify the data needed for your application and create a corresponding Model class or struct. Implement any necessary methods or logic within the Model.

7. Create your ViewModel: Build a ViewModel that interacts with the Model and provides the necessary data and behavior for the View. It should expose properties representing the state of the View and methods to handle user actions or events.
8. Design your View: Implement the user interface using either UIKit or SwiftUI, depending on your preference. Ensure that the View binds to the properties exposed by the ViewModel, so it can reflect changes in the data and respond to user interactions.
9. Establish communication: Connect the View and ViewModel by establishing a two-way binding or delegation mechanism. This allows the View to update based on changes in the ViewModel and enables the ViewModel to receive user input from the View.