This code template provides a robust foundation for implementing the Model-View-ViewModel (MVVM) pattern in C#, particularly useful in Unity development.

public interface IViewModel
{
		IViewModel Model { set; }
}

public interface IView
{
    IViewModel Model { set; }
}

public abstract class View : MonoBehaviour, IView
{
    public IViewModel Model
    {
        set => SetModel(value);
    }

    protected abstract void SetModel(IViewModel model);
}

public abstract class View<T> : View where T : IViewModel
{
    private T _model;

    protected new T Model
    {
        get => _model;
        set => SetModel(value);
    }

    protected override void SetModel(IViewModel model)
    {
        SetModel((T)model);
    }

    private void SetModel(T model)
    {
        if (_model != null)
        {
            OnModelUnset();
        }
        _model = model;
        if (_model != null)
        {
            OnModelSet();
        }
    }

    protected virtual void OnModelSet()
    {
    }

    protected virtual void OnModelUnset()
    {
    }
}

Let's explore into the components and functionality of this code template:

Key Components

• IViewModel Interface: Defines the basic structure for ViewModels. It includes a setter for the Model property, allowing ViewModels to be associated with Models.
• IView Interface: Establishes the contract for Views. It includes a setter for the Model property, enabling Views to be linked with ViewModels.
• View Abstract Class: Inherits from MonoBehaviour and implements IView. This class serves as a base for Unity-based Views, providing an abstract SetModel method.
• View<T> Generic Class: Extends the View class, offering type-safe handling of ViewModels. It includes protected methods for model setting and unsetting events.

Functionality

• Type Safety: The generic View<T> class ensures that only ViewModels of the correct type can be set, preventing runtime type errors.
• Event Handling: The OnModelSet() and OnModelUnset() virtual methods allow derived classes to react to changes in the associated ViewModel.
• Unity Integration: By inheriting from MonoBehaviour, this template seamlessly integrates with Unity's component-based architecture.
• Flexibility: The abstract and generic nature of the classes allows for easy extension and customization for specific use cases.

This template provides a solid starting point for developers looking to implement MVVM in their Unity projects, offering a balance between structure and flexibility. It facilitates clean separation of concerns and promotes maintainable, testable code.