在swift中点击按钮即可显示上下文菜单

let button = UIButton(type: .system)
button.setTitle("显示菜单", for: .normal)
button.addTarget(self, action: #selector(showContextMenu), for: .touchUpInside)

@objc func showContextMenu() {
    let menu = UIMenu(title: "上下文菜单", children: [
        UIAction(title: "选项1", handler: { _ in
            // 处理选项1的操作
        }),
        UIAction(title: "选项2", handler: { _ in
            // 处理选项2的操作
        }),
        UIAction(title: "选项3", handler: { _ in
            // 处理选项3的操作
        })
    ])
    
    let menuController = UIMenuController.shared
    menuController.showMenu(from: button, rect: button.bounds)
    menuController.menuItems = menu.children
}

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    super.touchesBegan(touches, with: event)
    UIMenuController.shared.hideMenu()
}