Swift как программно достать кнопку?

import SwiftUI

struct ContentView: View {
    var body: some View {
        VStack {
            Text("Hello World")
                .frame(maxWidth: 100, maxHeight: 100)
            Button(action: /*@START_MENU_TOKEN@*/{}/*@END_MENU_TOKEN@*/)
            {
                Text(/*@START_MENU_TOKEN@*/"Button"/*@END_MENU_TOKEN@*/)
            }

            List {
                /*@START_MENU_TOKEN@*/ /*@PLACEHOLDER=Content@*/Text("Content")/*@END_MENU_TOKEN@*/
            }
            Button(action: tst) {
                Text(/*@START_MENU_TOKEN@*/"Button"/*@END_MENU_TOKEN@*/)
            }
        }
    }
}

func tst()
{
    button.Text = "ddddd"
}

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