Open/Close DisclosureGroup

Hi,

In Xcode 12.01

I am working on a View with an unknown number of DisclosureGroups in a List. I want to close any open DisclosureGroup when the user expands DisclosureGroups.

For example here in this test code I have 100 DisclosureGroups in List and the code will close any open.

Code Block 
import SwiftUI
struct TestView: View {
    @State var selectedStrength = 0
    @State var expaned = Array(repeating: false, count: 100)
    var strengths = Array(repeating: "Test", count: 100)
    var body: some View {
        List {
            ForEach(0 ..< strengths.count, id: \.self) { strIndex in
                DisclosureGroup(isExpanded: $expaned[strIndex], content: {
                    Text("Group open \(strIndex)")
                } , label: {
                    Text("Group \(strIndex)")
                }).onChange(of: expaned[strIndex]) { _ in
                    if expaned[strIndex] {
                        for index in expaned.indices {
                            if index != strIndex {
                                expaned[index] = false
                            }
                        }
                    }
                }
            }
        }
    }
}

But how to handle this if the number number of DisclosureGroups not known?