import SwiftUI

struct Child: View {
  @Binding var text: String
  var body: some View {
    TextField("Enter", text: $text)
      .textFieldStyle(.roundedBorder)
  }
}

struct Parent: View {
  @State private var text = "Hello"
  var body: some View {
    VStack {
      Text(text)
      Child(text: $text)
    }
    .padding()
  }
}

                    

import SwiftUI

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

                    

import SwiftUI

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