如何在IOS中选择PDF文件

   override func viewDidLoad() {

       super.viewDidLoad()

   }

   @IBAction func selectPDFButtonTapped(_ sender: UIButton) {

       let documentPicker = UIDocumentPickerViewController(documentTypes: [kUTTypePDF as String], in: .import)

       documentPicker.delegate = self

       documentPicker.modalPresentationStyle = .formSheet

       present(documentPicker, animated: true, completion: nil)

   }

   func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt urls: [URL]) {

       // 处理选择的PDF文件

       let selectedPDFURL = urls.first

       // 进行进一步的操作，如显示PDF内容或上传到服务器等

   }

   override func viewDidLoad() {

       super.viewDidLoad()

       delegate = self

       allowsDocumentCreation = false

       allowsPickingMultipleItems = false

       // 设置支持的文件类型

       supportedContentTypes = [kUTTypePDF as String]

   }

   // 用户选择了一个PDF文件

   func documentBrowser(_ controller: UIDocumentBrowserViewController, didPickDocumentsAt documentURLs: [URL]) {

       let selectedPDFURL = documentURLs.first

       // 进行进一步的操作，如显示PDF内容或上传到服务器等

   }