SwiftUI - Catalyst translucent sidebar - swiftui

Question

Goal is to make a translucent sidebar on Mac Catalyst.
The code bellow gives a not translucent sidebar (image 1).
On Mac (not catalyst) the sidebar looks fine (image 2).
is it possible to have a translucent sidebar on Mac Catalyst?
import SwiftUI
struct ContentView: View {
var body: some View {
NavigationView {
//sidebar
List {
Label("Books", systemImage: "book.closed")
Label("Tutorials", systemImage: "list.bullet.rectangle")
}
.background(Color.clear)
.listStyle(SidebarListStyle())
//content
Text("Sidebar")
.navigationTitle("Sidebar")
}
}
}

Answer 1

You should select "Optimize Interface for Mac" in your target's General settings tab. Then the sidebar will be translucent.

Answer 2

Start with the AppDelegate main and follow Apple's tutorial re: UISplitViewController "Apply a Translucent Background to Your Primary View Controller".
https://developer.apple.com/documentation/uikit/mac_catalyst/optimizing_your_ipad_app_for_mac
In wrapping UISplitViewController in a UIViewControllerRepresentable, I wasn't able to get translucency, but did get full-height sidebar.

Answer 3

I figured out that using .background(Color.clear) on sidebar View makes possible translucent background even if ListStyle is not specified as SidebarListStyle(). Works in Xcode 13.1 for me
struct ContentView: View {
var body: some View {
NavigationView { // without wrapping to NavigationView it won't work
List { // can be VStack or HStack
Text("Hello, world!")
.padding()
}
.listStyle(SidebarListStyle()) // works with other styles
Text("")
}
}
}
struct YourApp: App {
var body: some Scene {
WindowGroup {
ContentView()
.toolbar {
Button {
} label: {
Image(systemName: "gear")
}
}
.background(Color.clear) // 3 <-- MUST HAVE!
}
}
}