LayoutPriority.swift

import SwiftUI

struct ContentView: View {
    @State var rectanglePriority: CGFloat = 0
    @State var circlePriority: CGFloat = 0
    
    var body: some View {
        ZStack {
            HStack {
                Rectangle()
                    .layoutPriority(rectanglePriority)
                Circle()
                    .layoutPriority(circlePriority)
            }
            VStack {
                Stepper("Rectangle \(rectanglePriority)", value: $rectanglePriority)
                Stepper("Circle  \(circlePriority)", value: $circlePriority)
            }
            .padding()
            .foregroundColor(.black)
            .background(Material.thin)
            .frame(maxHeight: .infinity, alignment: .bottom)
        }
    }
}