CustomControlStyle.swift

import SwiftUI


struct CheckboxToggleStyle: ToggleStyle {
    @Environment (\.isEnabled) var isEnabled
    
    func makeBody(configuration: Configuration) -> some View {
        HStack {
            configuration.label
            Image(systemName: configuration.isOn ? "checkmark.square" : "square")
                .resizable()
                .frame(width: 18, height: 18)
                .onTapGesture { configuration.isOn.toggle() }
        }
        // only .accentColor work, uncomment this and comment out the other one to see
//        .foregroundColor(isEnabled ? .accentColor : .gray)
        // change color stay .red regardless
        .foregroundColor(isEnabled ? .red : .purple)
    }
}


struct FilledButton: ButtonStyle {
    @Environment (\.isEnabled) var isEnabled

    func makeBody(configuration: Configuration) -> some View {
        configuration.label
        .padding()
//            .background(isEnabled ? Color.accentColor : Color.green)
            .background(isEnabled ? Color.orange : Color.green)
            .foregroundColor(.white)
            .cornerRadius(8)
    }
}

struct CheckboxToggleStyleIsDisabled: View {
    @State private var isOn = false
    @State private var disabled = false
    
    var body: some View {
        VStack {
            Spacer()
            Text("F'ing color do not change when it's disabled!!")
            Toggle(isOn: self.$isOn) {
                Text("Turn on")
            }
            .toggleStyle(CheckboxToggleStyle())
            .disabled(self.disabled)

            Button("Halleluja Why?") {
                
            }
            .buttonStyle(FilledButton())
            .disabled(self.disabled)
            
            Toggle(isOn: self.$isOn) {
                Text("Turn on")
            }
            .disabled(self.disabled)
            
            Spacer()
            Toggle(isOn: self.$disabled) {
                Text("Disable controls above 👆👆👆")
            }
        }
    }
}

struct CheckboxToggleStyleIsDisabled_Previews: PreviewProvider {
    static var previews: some View {
        CheckboxToggleStyleIsDisabled()
    }
}