如何在SwiftUI中的文件、编辑和查看前向应用程序菜单添加项目？

import SwiftUI

struct ContentView: View {
    var body: some View {
        Text("Hello, World!")
            .padding()
            .frame(maxWidth: .infinity, maxHeight: .infinity)
            .background(Color.white)
            .onAppear {
                NSApp.mainMenu = createMainMenu()
            }
    }
    
    func createMainMenu() -> NSMenu {
        let mainMenu = NSMenu()
        
        // 文件菜单
        let fileMenu = NSMenu()
        fileMenu.addItem(withTitle: "新建", action: #selector(newFile), keyEquivalent: "n")
        fileMenu.addItem(withTitle: "打开", action: #selector(openFile), keyEquivalent: "o")
        fileMenu.addItem(withTitle: "保存", action: #selector(saveFile), keyEquivalent: "s")
        fileMenu.addItem(withTitle: "退出", action: #selector(quitApp), keyEquivalent: "q")
        
        let fileMenuItem = NSMenuItem()
        fileMenuItem.submenu = fileMenu
        fileMenuItem.title = "文件"
        mainMenu.addItem(fileMenuItem)
        
        // 编辑菜单
        let editMenu = NSMenu()
        editMenu.addItem(withTitle: "撤销", action: #selector(undo), keyEquivalent: "z")
        editMenu.addItem(withTitle: "重做", action: #selector(redo), keyEquivalent: "y")
        editMenu.addItem(withTitle: "剪切", action: #selector(cut), keyEquivalent: "x")
        editMenu.addItem(withTitle: "复制", action: #selector(copy), keyEquivalent: "c")
        editMenu.addItem(withTitle: "粘贴", action: #selector(paste), keyEquivalent: "v")
        
        let editMenuItem = NSMenuItem()
        editMenuItem.submenu = editMenu
        editMenuItem.title = "编辑"
        mainMenu.addItem(editMenuItem)
        
        // 查看菜单
        let viewMenu = NSMenu()
        viewMenu.addItem(withTitle: "全屏", action: #selector(toggleFullScreen), keyEquivalent: "f")
        
        let viewMenuItem = NSMenuItem()
        viewMenuItem.submenu = viewMenu
        viewMenuItem.title = "查看"
        mainMenu.addItem(viewMenuItem)
        
        return mainMenu
    }
    
    // 文件菜单动作
    @objc func newFile() {
        // 处理新建文件逻辑
    }
    
    @objc func openFile() {
        // 处理打开文件逻辑
    }
    
    @objc func saveFile() {
        // 处理保存文件逻辑
    }
    
    @objc func quitApp() {
        NSApp.terminate(nil)
    }
    
    // 编辑菜单动作
    @objc func undo() {
        // 处理撤销逻辑
    }
    
    @objc func redo() {
        // 处理重做逻辑
    }
    
    @objc func cut() {
        // 处理剪切逻辑
    }
    
    @objc func copy() {
        // 处理复制逻辑
    }
    
    @objc func paste() {
        // 处理粘贴逻辑
    }
    
    // 查看菜单动作
    @objc func toggleFullScreen() {
        // 处理全屏切换逻辑
    }
}

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