[SWIFT]UIDocumentPickerViewController

@IBAction func pickerButton(_ sender: UIButton) {
	var documentPicker: UIDocumentPickerViewController!
         
    if #available(iOS 14, *) {
         documentPicker = UIDocumentPickerViewController(forOpeningContentTypes: [UTType.pdf])
    } else {
         documentPicker = UIDocumentPickerViewController(documentTypes: [kUTTypePDF as String], in: .import)
    }
         
    documentPicker.delegate = self
    documentPicker.allowsMultipleSelection = false
    documentPicker.modalPresentationStyle = .overFullScreen//.formSheet
         
    self.present(documentPicker, animated: true)
}

 

import UniformTypeIdentifiers
import MobileCoreServices

extension MainViewController: UIDocumentPickerDelegate {
    func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt urls: [URL]) {
        
        for url in urls {
            
            // Start accessing a security-scoped resource.
            guard url.startAccessingSecurityScopedResource() else {
                // Handle the failure here.
                return
            }
            
            do {
                let data = try Data.init(contentsOf: url)
                print("")
                // You will have data of the selected file
            }
            catch {
                print(error.localizedDescription)
            }
            
            // Make sure you release the security-scoped resource when you finish.
            defer { url.stopAccessingSecurityScopedResource() }
        }
    }
    
    func documentPickerWasCancelled(_ controller: UIDocumentPickerViewController) {
        controller.dismiss(animated: true, completion: nil)
    }
}