SwiftUI ButtonStyle with Disabled State

CustomButtonStyleWithDisabledState.swift

//  Created by Ben Morrison on 31/5/2023.

import SwiftUI

/// Create a custom button style that as you normally do
struct CustomButtonStyle: ButtonStyle {
    func makeBody(configuration: Configuration) -> some View {
        // This is differnet as you will not apply your changes here
        // We will return a view that takes the configuration instead
        CustomButtonStyleView(configuration: configuration)
    }
    
    /// Custom view that will contain all the changes for your
    /// button, including the disabled state.
    private struct CustomButtonStyleView: View {
        // Binds to the view's `isEnabled` to allow updates for disabled.
        @Environment(\.isEnabled) var isEnabled: Bool
        // The configuration from the CustomButtonStyle's makeBody(configuration:)
        let configuration: ButtonStyle.Configuration
        
        var body: some View {
            configuration.label
                .padding()
                .foregroundColor(isEnabled ? .green : .black)
                .background(isEnabled ? .black : .gray)
                .cornerRadius(8.0)
        }
    }
}

extension ButtonStyle where Self == CustomButtonStyle {
    /// Allows us to use `.customButton` in the `buttonStyle()` function
    static var customButton: CustomButtonStyle { CustomButtonStyle() }
}

/// Mark: - Usage Example

Button {
    // some action
} label: {
    Text("Custom Button")
}
.buttonStyle(.customButton)