SwiftUI中级List如何添加新内容(2020年教程)

import SwiftUI

struct ListAddItemView: View {
  @State var products = ["手机","电脑","水杯"]
  @State var pName:String = ""
  var body: some View {
    VStack{
      TextField("新商品:",text: self.$pName)
      Button(action:{
        print("hello")
        if (self.pName != "")
        {
          self.products.append(self.pName)
          self.pName = ""
          
        }
        
      }){
        Text("添加一个商品")
      }
      
      List(products,id:\.self){ item in
        Text(item)
        
      }
      
    }
    
    
  }
}