A container that collapses.

CollapsableView.swift

//Based off of https://rensbr.eu/blog/swiftui-escaping-closures/
struct CollapsableView<Content: View>: View {
    let content: Content
    @Binding var isVisible:Bool

    init(value:Binding<Bool>, @ViewBuilder content: () -> Content) {
      self.content = content()
      self._isVisible = value
  }
    

  var body: some View {
    VStack {
      if isVisible {
        content
      }
      Button(isVisible ? "↓ open" : "↑ close") {
        isVisible.toggle()
      }
    }
  }
}

struct ContentView: View {
    @State var seeTheThing = true
    var body: some View {
        CollapsableView(value: $seeTheThing) {
            Text("Hi!")
        }
    }
}

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