Toggles and labels aligned at fixed size

gistfile1.swift

struct ToggleWidthPreferenceKey: PreferenceKey {
    static let defaultValue: CGFloat = 0
    static func reduce(value: inout CGFloat, nextValue: () -> CGFloat) {
        value = max(value, nextValue())
    }
}

extension View {
    func measureToggle() -> some View {
        self.background(GeometryReader { geometry in
            Color.clear.preference(
                key: ToggleWidthPreferenceKey.self,
                value: geometry.size.width
            )
        })
    }
}

struct ContentView: View {
    @State var condition1 = false
    @State var condition2 = false

    @State var toggleMaxWidth: CGFloat?

    var body: some View {
        VStack(alignment: .leading) {
            Toggle(isOn: $condition1) {
                Text("Condition One")
            }
            .measureToggle()
            .frame(width: toggleMaxWidth)

            Toggle(isOn: $condition2) {
                Text("Condition Two Two")
            }
            .measureToggle()
            .frame(width: toggleMaxWidth)
        }
        .padding()
        .border(Color.blue)
        .fixedSize()
        .onPreferenceChange(ToggleWidthPreferenceKey.self) {
            toggleMaxWidth = $0
        }
    }
}