如何在swift 5中的共享表IOS中添加创建pdf按钮

import UIKit
import PDFKit

class SharedTableViewController: UITableViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 添加创建PDF按钮
        let createPDFButton = UIButton(type: .system)
        createPDFButton.setTitle("创建PDF", for: .normal)
        createPDFButton.addTarget(self, action: #selector(createPDFButtonTapped), for: .touchUpInside)
        navigationItem.rightBarButtonItem = UIBarButtonItem(customView: createPDFButton)
    }
    
    @objc func createPDFButtonTapped() {
        // 创建PDF文档
        let pdfRenderer = UIGraphicsPDFRenderer(bounds: CGRect(x: 0, y: 0, width: 612, height: 792))
        let pdfURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0].appendingPathComponent("sharedTable.pdf")
        
        do {
            try pdfRenderer.writePDF(to: pdfURL, withActions: { (context) in
                // 添加页面
                context.beginPage()
                
                // 绘制内容
                let text = "这是一个共享表的PDF示例"
                let attributes = [NSAttributedString.Key.font: UIFont.systemFont(ofSize: 24)]
                let attributedText = NSAttributedString(string: text, attributes: attributes)
                attributedText.draw(at: CGPoint(x: 50, y: 50))
                
                // 绘制其他内容...
                
                // 结束页面
                context.endPage()
            })
            
            print("PDF创建成功，路径：\(pdfURL)")
        } catch {
            print("PDF创建失败：\(error)")
        }
    }
}