SwiftUI button ViewModel example for Lessons in SwiftUI blog post (3rd example)

swiftui-buttons-viewmodel-example-3.swift

struct VrboButtonStyle: ButtonStyle {

    let iconMode: UTButtonIconMode?
    let inverse: Bool
    let size: UTButtonSize
    let type: UTButtonType

    func makeBody(configuration: Configuration) -> some View {
        ButtonStyleView(configuration: configuration,
                        type: type,
                        size: size,
                        inverse: inverse,
                        iconMode: iconMode)
    }
}

private struct ButtonStyleView: View {
    
    typealias ViewModel = ButtonViewModel
    
    @Environment(\.isEnabled) private var isEnabled: Bool
    
    let configuration: ButtonStyle.Configuration
    let viewModel: ViewModel

    init(configuration: ButtonStyle.Configuration,
         type: ButtonType,
         size: ButtonSize,
         inverse: Bool,
         iconMode: ButtonIconMode?) {
        self.configuration = configuration
        self.viewModel = ViewModel(iconMode: iconMode, inverse: inverse, size: size, type: type)
    }

    var body: some View {
        configuration.label
            .fixedSize()
            .lineLimit(2)
            .multilineTextAlignment(.center)
            .frame(width: viewModel.width, height: viewModel.height)
            .padding(viewModel.padding)
            .background(viewModel.backgroundColor(for: isEnabled, isPressed: configuration.isPressed))
            .foregroundColor(viewModel.foregroundColor(for: isEnabled, isPressed: configuration.isPressed))
            .cornerRadius(viewModel.cornerRadius)
            .modifier(VrboText(typeStyle: viewModel.typeStyle))
            .overlay(
                RoundedRectangle(cornerRadius: viewModel.cornerRadius)
                    .stroke(viewModel.borderColor(for: isEnabled, isPressed: configuration.isPressed), lineWidth: 1)
            )
            .accentColor(viewModel.accentColor(for: isEnabled, isPressed: configuration.isPressed))
            .scaleEffect(viewModel.scaleEffect(for: isEnabled, isPressed: configuration.isPressed))
            .animation(.spring())
    }
}