如何在ios中打开原生文件app？

import UIKit

class ViewController: UIViewController, UIDocumentInteractionControllerDelegate {
    var documentInteractionController: UIDocumentInteractionController!

    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 文件路径
        let filePath = Bundle.main.path(forResource: "example.pdf", ofType: nil)
        let fileURL = URL(fileURLWithPath: filePath!)
        
        // 初始化UIDocumentInteractionController
        documentInteractionController = UIDocumentInteractionController(url: fileURL)
        documentInteractionController.delegate = self
    }
    
    @IBAction func openFileButtonTapped(_ sender: UIButton) {
        // 显示菜单
        documentInteractionController.presentOptionsMenu(from: sender.frame, in: view, animated: true)
    }
    
    // UIDocumentInteractionControllerDelegate方法，用于处理用户选择的原生文件App
    func documentInteractionController(_ controller: UIDocumentInteractionController, didEndSendingToApplication application: String?) {
        print("用户选择了\(application ?? "")打开文件")
    }
}