import SwiftUI

struct ContentView: View {
    @State var textColor = Color.black

    var body: some View {
        NavigationView {
            VStack {
                Text("Witaj w mojej aplikacji!")
                    .foregroundColor(textColor)
                NavigationLink(
                    destination: ColorSelectionView(textColor: $textColor),
                    label: {
                        Text("Wybierz kolor")
                            .foregroundColor(.white)
                            .padding()
                            .background(Color.blue)
                            .cornerRadius(10)
                    })
            }
            .navigationTitle("Aplikacja z kolorem")
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}


=============

import SwiftUI

struct ColorSelectionView: View {
    @Binding var textColor: Color

    var body: some View {
        VStack {
            Text("Wybierz kolor tekstu:")
            HStack {
                ColorBox(color: .red, textColor: $textColor)
                ColorBox(color: .green, textColor: $textColor)
            }
            HStack {
                ColorBox(color: .blue, textColor: $textColor)
                ColorBox(color: .yellow, textColor: $textColor)
            }
        }
        .navigationTitle("Wybór koloru")
    }
}

struct ColorSelectionView_Previews: PreviewProvider {
    static var previews: some View {
        ColorSelectionView(textColor: .constant(Color.black))
    }
}


=================

import SwiftUI

struct ColorBox: View {
    let color: Color
    @Binding var textColor: Color

    var body: some View {
        Button(action: {
            textColor = color
        }, label: {
            RoundedRectangle(cornerRadius: 10)
                .fill(color)
                .frame(width: 50, height: 50)
                .overlay(
                    RoundedRectangle(cornerRadius: 10)
                        .stroke(textColor == color ? Color.white : Color.clear, lineWidth: 4)
                )
        })
    }
}

struct ColorBox_Previews: PreviewProvider {
    static var previews: some View {
        ColorBox(color: .red, textColor: .constant(Color.black))
    }
}