SwiftUI app for a paint canvas

ContentView.swift

//
//  ContentView.swift
//  2Darrays
//
//  Created by Kelly Lougheed on 12/3/20.
//

import SwiftUI

var selectedColor: Color = Color.black

struct MyRectangle: View {
    
    @State var myColor: Color
    
    var body: some View {
        Button(action: {
            myColor = selectedColor
        }) {
            Rectangle()
                .fill(myColor)
                .aspectRatio(contentMode: .fit)
                .border(Color.black, width: 0.5)
        }
    }
}

struct ColorButton: View {
    
    @State var color: Color
    
    var body: some View {
        Button(action: {
            selectedColor = color
        }) {
            Rectangle()
                .fill(color)
                .aspectRatio(contentMode: .fit)
        }
    }
}


struct ContentView: View {
    
    var body: some View {
        VStack {
            Text("Select your color...")
            HStack {
                ColorButton(color: Color.red)
                ColorButton(color: Color.yellow)
                ColorButton(color: Color.green)
                ColorButton(color: Color.blue)
            }
            Text("...and draw on the canvas below!")
            Button(action: {
                selectedColor = Color.white
            }) {
                Text("Eraser").padding(20)
            }
            Spacer()
            HStack(spacing: 0) {
                ForEach(0..<10) { x in
                    VStack(spacing: 0) {
                        ForEach(0..<10) { y in
                            MyRectangle(myColor: Color.white)
                        }
                    }
                }
            }
        }
    }
}

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