如何使矩形的高度与VStack的高度相同

import SwiftUI

struct ContentView: View {
    @State private var rectangleHeight: CGFloat = 0
    
    var body: some View {
        GeometryReader { geometry in
            VStack {
                Text("VStack")
                    .font(.title)
                    .padding()
                
                VStack {
                    Rectangle()
                        .fill(Color.blue)
                        .frame(width: 200, height: self.rectangleHeight)
                }
                .background(GeometryReader { proxy in
                    Color.clear
                        .onAppear {
                            self.rectangleHeight = proxy.size.height
                        }
                })
            }
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}