Simple ViewModel

Simple ViewModel is a design pattern used in software development. In this pattern, the UI code is separated from the logic code. The UI elements of an application are bound to a ViewModel object. The ViewModel object provides the data and the logic that the UI elements need to function.

Why Use Simple ViewModel?

The Simple ViewModel design pattern has some advantages:

• It separates the UI code from the logic code, making the application more organized and easier to maintain.
• It allows the UI elements to be dynamic and data-driven, so changes can be made without modifying the UI code directly.
• It promotes the use of data binding, which reduces the amount of boilerplate code needed to control the UI elements.

Example

Here is an example of how Simple ViewModel can be used with a simple counter application:

class CounterViewModel {
    private(set) var count = 0
    
    func increment() {
        count += 1
    }
    
    func decrement() {
        count -= 1
    }
}

let viewModel = CounterViewModel()

// Bind the count label to the count property of the view model
countLabel.bind(to: viewModel.count)

// Bind the increment button to the increment method of the view model
incrementButton.bind(to: viewModel.increment)

// Bind the decrement button to the decrement method of the view model
decrementButton.bind(to: viewModel.decrement)

In this example, the CounterViewModel object provides the data and logic for the counter application. The UI elements are bound to the ViewModel object using data binding.

Conclusion

Simple ViewModel is a powerful design pattern that separates the UI code from the logic code. It allows for dynamic and data-driven UI elements and reduces the amount of boilerplate code needed to control the UI. By using Simple ViewModel, developers can create more organized and maintainable applications.