mport SwiftUI
import UniformTypeIdentifiers
@main
struct ShapeEditApp: App {
    var body: some Scene {
        DocumentGroup(newDocument: ShapeDocument()) { file in
            DocumentView(document: file.$document)
        }
        .commands {
            CommandMenu("Shapes") {
                Button("Add Shape...", action: addShape)
                    .keyboardShortcut("N")
                Button("Add Text", action: addText)
                    .keyboardShortcut("T")
            }
        }
    }
    
    func addShape() {}
    func addText() {}
}
struct DocumentView: View {
    @Binding var document: ShapeDocument
    
    var body: some View {
        Text(document.title)
            .frame(width: 300, height: 200)
    }
}
struct ShapeDocument: Codable {
    var title: String = "Untitled"
}
extension UTType {
    static let shapeEditDocument =
        UTType(exportedAs: "com.example.ShapeEdit.shapes")
}
extension ShapeDocument: FileDocument {
    static var readableContentTypes: [UTType] { [.shapeEditDocument] }
    
    init(fileWrapper: FileWrapper, contentType: UTType) throws {
        let data = fileWrapper.regularFileContents!
        self = try JSONDecoder().decode(Self.self, from: data)
    }
    func write(to fileWrapper: inout FileWrapper, contentType: UTType) throws {
        let data = try JSONEncoder().encode(self)
        fileWrapper = FileWrapper(regularFileWithContents: data)
    }
}





Code Block 
import SwiftUI
struct ContentView: View {
    var graphics: [Graphic]
    
    var body: some View {
        List(graphics, children: \.children) { graphic in
            GraphicRow(graphic)
        }
        .listStyle(SidebarListStyle())
    }
}
struct Graphic: Identifiable {
    var id: String
    var name: String
    var icon: Image
    var children: [Graphic]?
}
struct GraphicRow: View {
    var graphic: Graphic
    
    init(_ graphic: Graphic) {
        self.graphic = graphic
    }
    
    var body: some View {
        Label {
            Text(graphic.name)
        } icon: {
            graphic.icon
        }
    }
}