使用自iOS 13起可用的UIContextMenuInteraction：

import PDFKit

class ViewController: UIViewController, UIContextMenuInteractionDelegate {
    // ...

    override func viewDidLoad() {
        super.viewDidLoad()

        // Set up the UIContextMenuInteraction for your PDFView
        let interaction = UIContextMenuInteraction(delegate: self)
        pdfView.addInteraction(interaction)
    }

    // Implement the UIContextMenuInteractionDelegate method
    func contextMenuInteraction(_ interaction: UIContextMenuInteraction, configurationForMenuAtLocation location: CGPoint) -> UIContextMenuConfiguration? {
        return UIContextMenuConfiguration(identifier: nil, previewProvider: nil) { _ in
            // Create an empty UIMenu
            return UIMenu(title: "", children: [])
        }
    }
}

“Highlight”上下文菜单项是默认UIEditMenuInteraction的一部分，它现在是在PDFView中处理文本选择和编辑的首选方式。要删除“Highlight”菜单项，可以覆盖PDFView的editMenuInteraction属性，并将其menuItems属性设置为空数组。
下面是如何执行此操作的示例：

class MyViewController: UIViewController {

    @IBOutlet weak var pdfView: PDFView!

    override func viewDidLoad() {
        super.viewDidLoad()

        // Remove the "Highlight" menu item from the default UIEditMenuInteraction
        pdfView.editMenuInteraction?.menuItems = []
    }
}

这将从上下文菜单中删除“高亮显示”菜单项，当您长按以选择PDF中的文本时，该菜单项会出现。
也可以使用UIEditMenuInteraction将自定义菜单项添加到上下文菜单。为此，可以向UIEditMenuInteraction的menuItems属性添加项。

class MyViewController: UIViewController {

    @IBOutlet weak var pdfView: PDFView!

    override func viewDidLoad() {
        super.viewDidLoad()

        // Create a custom menu item
        let myMenuItem = UIMenuItem(title: "My Item", action: #selector(myMenuItemTapped))

        // Add the custom menu item to the default UIEditMenuInteraction
        pdfView.editMenuInteraction?.menuItems.append(myMenuItem)
    }

    @objc func myMenuItemTapped() {
        // Do something when the custom menu item is tapped
    }
}

我希望这对你有帮助！