import SwiftUI

struct ExplicitDemo: View {
  @State private var angle = 0.0
  var body: some View {
    VStack(spacing: 12) {
      Image(systemName: "arrow.2.circlepath")
        .rotationEffect(.degrees(angle))
      Button("Rotate") {
        withAnimation(.easeInOut) { angle += 180 }
      }
    }
  }
}

                    

import SwiftUI

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

                    

import SwiftUI

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