SwiftUI. Animate Button.

SwiftUI-Animate-Button.swift

import SwiftUI

struct ContentView: View {
  @State private var scale: CGFloat = 1
  var body: some View {
    Button(action: {
      withAnimation(.easeIn(duration: 1)) {
        self.scale += 20
      }
      DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
        withAnimation(.easeIn(duration: 1)) {
          self.scale = 1
        }
      }
    }) {
      Image(systemName: "sun.max.fill")
        .font(.system(size: 40))
        .foregroundColor(Color.yellow)
        .scaleEffect(scale)
    }
  }
}

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