ios - 在 SwiftUI 中运行时创建控件

Question

以下代码在运行时每次按下按钮时都会创建新控件，问题是选择器选择设置为相同状态。
如何创建具有不同状态变量的新控件，以便它们可以单独操作？

struct ContentView: View {

   @State private var numberOfControlls = 0
   @State var selection: String="1"
    
    var body: some View {

        
        
      VStack {
          Button(action: {
              self.numberOfControlls += 1
          }) {
              Text("Tap to add")
          }

          ForEach(0 ..< numberOfControlls, id: \.self) { _ in
            
            Picker(selection: self.$selection, label: 
                Text("Picker") {

                Text("1").tag(1)
                Text("2").tag(2)
             }

         
          }
       }
        
    }
}

Answer 1

How can I create new controls with different state variables so they can operate separately ?

将控件分离到具有自己状态的独立 View 中(或在需要时查看模型)。
这是一个演示:

struct ContentView: View {

   @State private var numberOfControlls = 0

    var body: some View {
      VStack {
          Button(action: {
              self.numberOfControlls += 1
          }) {
              Text("Tap to add")
          }

          ForEach(0 ..< numberOfControlls, id: \.self) { _ in
            ControlView()
          }
       }
    }
}

struct ControlView: View {
   @State var selection: String="1"
    var body: some View {
        Picker(selection: self.$selection, label:
            Text("Picker")) {

            Text("1").tag(1)
            Text("2").tag(2)
         }
    }
}