SwiftUI - 存储按钮选择的值

Question

I have an HStack of buttons which a user can select that act like radio buttons. I'm having trouble figuring out how to store the user's selection. I pull MyRadioButtons() into another view, and I think my challenge is how to access the id associated with each button so that I can then store the ID.

I used this answer as a reference and have modified slightly to fit my needs, but this is more or less my code

struct MyRadioButton: View {
    let id: Int
    @Binding var currentlySelectedId: Int
    var body: some View {
        Button(action: { self.currentlySelectedId = self.id }, label: { Text("Tap Me!") })
            .foregroundColor(id == currentlySelectedId ? .green : .red)
    }
}


struct MyRadioButtons: View {
    @State var currentlySelectedId: Int = 0
    var body: some View {
        VStack {
            MyRadioButton(id: 1, currentlySelectedId: $currentlySelectedId)
            MyRadioButton(id: 2, currentlySelectedId: $currentlySelectedId)
            MyRadioButton(id: 3, currentlySelectedId: $currentlySelectedId)
            MyRadioButton(id: 4, currentlySelectedId: $currentlySelectedId)
        }
    }
}

Then in the view the user is interacting with, I have this in a VStack along with some other fields...

     MyRadioButtons()
     Button(action: {
     item.selection = [RadioButton ID Here]})

Answer 1

This should do it:

struct MyRadioButton: View {
    let id: Int
    @Binding var currentlySelectedId: Int
    var body: some View {
        Button(action: { self.currentlySelectedId = self.id }, label: { Text("Tap Me!") })
            .foregroundColor(id == currentlySelectedId ? .green : .red)
    }
}


struct MyRadioButtons: View {
    init(selection: Binding<Int>) {
        self._currentlySelectedId = selection
    }
    @Binding var currentlySelectedId: Int
    var body: some View {
        VStack {
            MyRadioButton(id: 1, currentlySelectedId: $currentlySelectedId)
            MyRadioButton(id: 2, currentlySelectedId: $currentlySelectedId)
            MyRadioButton(id: 3, currentlySelectedId: $currentlySelectedId)
            MyRadioButton(id: 4, currentlySelectedId: $currentlySelectedId)
        }
    }
}

Then you can use it like this:

struct ContentView: View {
    @State var selection: Int = 0

    var body: some View {
        VStack {
            MyRadioButtons(selection: $selection)
            Button(action: {
                //whatever
            }) {
                Text("Click me!")
            }
        }
    }
}