如何使用 HSplitViews 创建左中右三栏布局？

struct ContentView: View {
   var body: some View {
      GeometryReader{geometry in
         HSplitView(){
            Rectangle()
                .frame(minWidth: 0, idealWidth: 200, maxWidth: .infinity)
            HSplitView(){
                Rectangle().layoutPriority(1)
                Rectangle().foregroundColor(.green).frame(minWidth:200, idealWidth: 200, maxWidth: .infinity)
            }.layoutPriority(1)
         }
         .frame(width: geometry.size.width, height: geometry.size.height)
      }
   }
}