Customize navigation bar background

SwiftUI has some new APIs for iOS 16 to customize toolbars, including visibility and background. To set custom background on toolbars we can use toolbarBackground() modifier. To set a background on a navigation bar that shows when content scrolls behind the bar, we should specify a ShapeStyle, such as a color, material or gradient and navigationBar placement in the modifier.

struct ContentView: View {
    var body: some View {
        NavigationStack {
            List(1...20, id: \.self) {
                Text("\($0)")
            }
            .listStyle(.plain)
            .navigationTitle("My List")
            
            .toolbarBackground(.indigo, in: .navigationBar)
        }
    }
}

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