Basics - Dice Demo, calculate total score

I've worked through Apple's dice demo for SwiftUI, so far so good. I've got a single Die view with a button to "roll" the die. This works perfectly using the code below:

struct DieView: View { init(dieType: DieType) { self.dieValue = Int.random(in: 1...dieType.rawValue) self.dieType = dieType }

@State private var dieValue: Int
@State private var dieType: DieType

var body: some View {
    VStack {
        if self.dieType == DieType.D6 {
            Image(systemName: "die.face.\(dieValue)")
                .resizable()
                .frame(width: 100, height: 100)
                .padding()
        }
        else {//self.dieType == DieType.D12{
            Text("\(self.dieValue)")
                .font(.largeTitle)
        }
        Button("Roll"){
            withAnimation{
                dieValue = Int.random(in: 1...dieType.rawValue)
            }
        }
        .buttonStyle(.bordered)
    }
    
    

    Spacer()
}

}

Now I want to do a DiceSetView with an arbitrary number of dice. I've got the UI working with the following;

struct DiceSetView: View { @State private var totalScore: Int = 0

var body: some View {
    ScrollView(.horizontal) {
        HStack{
            DieView(dieType: DieType.D6)
            DieView(dieType: DieType.D6)
            DieView(dieType: DieType.D6)
        }
    }
    HStack{
    
        Button("Roll All"){}
                    .buttonStyle(.bordered)
        Text("Score \(totalScore)")
            .font(.callout)
    }
    Spacer()
}

}

Where I'm struggling is how to get the total of all the dice in a set and to roll all the dice in a set on a button click.

I can't iterate through the dice, and just "click" the buttons in the child views from their parents, and I can't think how it should be structured to achieve this (I'm new to this style of programming!) - can anyone point me in the right direction for how to achieve what I want? I realise that I'm probably missing something fundamentally conceptual here....