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 name = "Kai"
  var body: some View {
    VStack { Text(name); Child(text: $name) }.padding()
  }
}

                    

import SwiftUI

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

                    

import SwiftUI

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