import SwiftUI

struct EnvironmentDemo: View {
  @Environment(\.colorScheme) var scheme
  var body: some View {
    Text("Scheme: \(scheme == .dark ? \"Dark\" : \"Light\")")
      .padding()
  }
}

                    

import SwiftUI

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

                    

import SwiftUI

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