SpringAnimationSample.swift

import SwiftUI

struct ContentView: View {
    @State var isShrinked = false
    @State var response: CGFloat = 1
    @State var dampingFraction: CGFloat = 0.5
    @State var blendDuration: CGFloat = 0

    var body: some View {
        VStack {
            Circle()
                .padding(50)
                .foregroundColor(.purple)
                .scaleEffect(isShrinked ? 0.5 : 1)
                .animation(.spring(response: response, dampingFraction: dampingFraction, blendDuration: blendDuration), value: isShrinked)

            Text("response: " + response.description)
            Slider(value: $response, in: 0...2)
            Text("dampingFraction: " + dampingFraction.description)
            Slider(value: $dampingFraction, in: 0...2)
            Text("blendDuration: " + blendDuration.description)
            Slider(value: $blendDuration, in: 0...5)

            Button("Animate") {
                withAnimation {
                    isShrinked.toggle()
                }
            }
        }
        .padding()
    }
}