タップした時に縮小するスケールボタン

ContentView.swift

import PlaygroundSupport
import SwiftUI
import SceneKit

struct ContentView: View {
    @State var isFavorite = false
    
    var body: some View {
        VStack(spacing: 30) {
            HStack(spacing: 20) {
                Button {
                    print("tap")
                } label: {
                    Text("Back")
                        .font(.body)
                        .foregroundColor(.cyan)
                        .frame(width: 150, height: 60)
                        .background(.clear)    // .whiteにすれば下記の.contentShapeは不要
                        .overlay(
                            RoundedRectangle(cornerRadius: 30)
                                .stroke(.cyan, lineWidth: 3)
                        )
                        .contentShape(RoundedRectangle(cornerRadius: 30))
                }
                .buttonStyle(ScaleButtonStyle())
                
                Button {
                    print("tap")
                } label: {
                    Text("Next")
                        .font(.body)
                        .foregroundColor(.white)
                        .frame(width: 150, height: 60)
                        .background(.cyan)
                        .cornerRadius(30)
                }
                .buttonStyle(ScaleButtonStyle())
            }
            
            Button {
                print("tap")
                isFavorite.toggle()
            } label: {
                Image(systemName: isFavorite ? "heart.fill": "heart")
                    .resizable()
                    .renderingMode(.original)
                    .frame(width: 50, height: 50)
            }
            .buttonStyle(ScaleButtonStyle())
        }
    }
}

struct ScaleButtonStyle: ButtonStyle {
    func makeBody(configuration: Configuration) -> some View {
        configuration.label
            .scaleEffect(configuration.isPressed ? 0.9 : 1)
    }
}