This is an example of how you can support differentiation without color in your applications.

DifferentiateWithoutColorExample.swift

import SwiftUI

struct DifferentiateWithoutColorExample: View {
    @Environment(\.accessibilityDifferentiateWithoutColor) var differentiateWithoutColor
    
    var body: some View {
        HStack {
            if differentiateWithoutColor {
                Image(systemName: "checkmark.circle")
            }
            Text("Success")
        }
        .padding()
        .background(differentiateWithoutColor ? .black : .green)
        .foregroundColor(.white)
        .clipShape(Capsule())
    }
}