Native source code for CodeSlicing quick tips episode on applying effects to views

AddingEffectsToViewsDemoNative.swift

//
//  AddingEffectsToViewsDemoNative.swift
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
//  of the Software, and to permit persons to whom the Software is furnished to do so,
//  subject to the following conditions:
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
//  INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
//  PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
//  COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
//  AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
//  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
//  Copyright © 2021 Adam Fordyce. All rights reserved.
//

import SwiftUI

struct AddingEffectsToViewsDemoNative: View {
    var body: some View {
        LikeButton()
            .frame(width: 200, height: 200)
            .compositingGroup()
            .shadow(color: Color(white: 0.3), radius: 5)
    }
}

private struct LikeButton: View {
    
    @State private var isLiked = false
    
    var body: some View {
        GeometryReader { (geo: GeometryProxy) in
            let minDimension = min(geo.size.width, geo.size.height)
            Button {
                isLiked.toggle()
            } label: {
                ZStack {
                    Circle()
                        .fill(.blue)
                        .background(Circle()
                                        .fill(.white)
                                        .frame(width: minDimension * 1.1, height:  minDimension * 1.1))
                    Image(systemName: isLiked ? "hand.thumbsup.fill" : "hand.thumbsup")
                        .resizable()
                        .frame(width: minDimension * 0.5, height: minDimension * 0.5)
                        .offset(y: -minDimension * 0.02)
                        .foregroundColor(.white)
                }
            }
        }
    }
}

struct AddingEffectsToViewsDemoNative_Previews: PreviewProvider {
    struct AddingEffectsToViewsDemoNative_Harness: View {

        var body: some View {
            AddingEffectsToViewsDemoNative()
                .frame(maxWidth: .infinity, maxHeight: .infinity)
                .ignoresSafeArea()
        }
    }

    static var previews: some View {
        AddingEffectsToViewsDemoNative_Harness()
        
            .previewDevice("iPhone 13 Pro Max")
            .previewDisplayName("iPhone 13 Pro Max")
    }
}