import SwiftUI

struct ImplicitMultiDemo: View {
  @State private var on = false
  var body: some View {
    VStack(spacing: 16) {
      Image(systemName: "star.fill")
        .font(.system(size: 48))
        .foregroundStyle(on ? .yellow : .gray)
        .scaleEffect(on ? 1.25 : 1.0)
        .opacity(on ? 1 : 0.6)
        .animation(.easeInOut(duration: 0.6), value: on)
      Button(on ? "Reset" : "Animate") { on.toggle() }
    }
    .padding()
  }
}

                    

import SwiftUI

struct ContentView: View {
  var body: some View { ImplicitMultiDemo() }
}

                    

import SwiftUI

@main
struct MyApp: App {
  var body: some Scene {
    WindowGroup { ContentView() }
  }
}