@published-exmple.swift

@published-exmple.swift

//
//  ContentView.swift
//  LayoutAndGeometry
//
//  Created by 陈嘉耀 on 2021/6/17.
//

import SwiftUI
import Combine



class TestViewModel : ObservableObject {
    @Published var name:String
    var age:Int
    
    init(name:String, age:Int) {
        self.name = name
        self.age = age
    }
}


struct ContentView: View {
    
    @ObservedObject var vm = TestViewModel(name: "jaychen", age: 12)
    
    var body: some View {
        
        VStack{
            TextField("input your name", text: $vm.name)
                .frame(width: 200)
                .textFieldStyle(RoundedBorderTextFieldStyle())
            
            Text("your name is \(vm.name)")
        }.padding()
        
    }
}



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