import SwiftUI

struct ToolbarBasicDemo: View {
  var body: some View {
    NavigationStack {
      Text("Content")
        .navigationTitle("Toolbar")
        .toolbar {
          ToolbarItem(placement: .navigationBarLeading) { Button("Cancel") {} }
          ToolbarItem(placement: .navigationBarTrailing) { Button("Add") {} }
        }
    }
  }
}

                    

import SwiftUI

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

                    

import SwiftUI

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