array-child-binding.swift

import SwiftUI

struct Model {
  var title: String
  var body: String
}

struct ContentView : View {
  @State var models : [Model] = [
    Model(title: "First Entry", body: "first body"),
    Model(title: "Second Entry", body: "second body"),
    Model(title: "Third Entry", body: "third body")
  ]
  var body: some View {
    NavigationView() {
      List{
        ForEach(0..<models.count){ index in
          NavigationLink(destination: ModelDetail(model: self.$models[index])) {
            HStack {
              Text(self.models[index].title)
            }
          }
        }
      }
      .navigationBarTitle("Models")
      .navigationBarItems(trailing: EditButton())
    }
  }
}

struct ModelDetail: View {
  @Binding var model: Model

  var body: some View {
    VStack {
      Text(model.title)
      Text(model.body)
      Button(action: {
        self.model.title = "My changed title from subview"
      }) {
        Text("Change the title")
      }
    }
  }
}

struct View_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}