SwiftUI 如何添加偏好设置界面？

在 macOS 上，SwiftUI 的 Settings 是官方提供的方法为 偏好设置界面 添加界面。

struct SettingsView: View {
    @State private var selection = "Red"
    let colors = ["Red", "Green", "Blue", "Black", "Tartan"]

    var body: some View {
        Form {
            Picker("Select a paint color", selection: $selection) {
                ForEach(colors, id: \.self) {
                    Text($0)
                }
            }
            .pickerStyle(InlinePickerStyle())
        }
        .frame(width: 300)
        .navigationTitle("Demo Settings")
        .padding(80)
    }
}

@main
struct DemoApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
        #if os(macOS)
        Settings {
            SettingsView()
        }
        #endif
    }
}