UIDocumentPickerViewController not working on Mac Catalyst?

Question

Created Jan ’20

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I have used UIDocumentPickerViewController in application in order to retrieve files from iCloud Drive. Since i'm using SwiftUI only the picker is incapsulated in the within SwiftUI's View with a protocol UIViewControllerRepresentable.

It works perfectly on iOS/iPadOS, but when i'm trying to launch application on Mac via Catalyst i'm just seeing an empty view on picker's modal view. So just modal pop up with no content at all.

Have anyone faced same issue with this picker?

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Answer 1

cesare1965 OP

Feb ’20

import SwiftUI
struct ContentView: View {
  @State private var isFilePickerShown = false
  @State private var picker = DocumentPicker()
  var body: some View {
  VStack {
  Button(action: {
  self.isFilePickerShown.toggle()
  #if targetEnvironment(macCatalyst)
  UIApplication.shared.windows[0].rootViewController!.present(self.picker.viewController, animated: true)
  #endif
  }) {
  Image(systemName: "rectangle.and.paperclip").resizable().frame(width: 70, height: 70)
  }
  }
  .sheet(isPresented: $isFilePickerShown, onDismiss: {self.isFilePickerShown = false}) {
  DocPickerViewController(callback: self.filePicked, onDismiss: { self.isFilePickerShown = false })
  }
  }
  func filePicked(_ url: URL) {
  print("\nThe url is: \(url)")
  }
}

and now create new swiftui file

DocumentPicker

for MacOS:

import SwiftUI
final class DocumentPicker: NSObject, UIViewControllerRepresentable {
  typealias UIViewControllerType = UIDocumentPickerViewController
  lazy var viewController:UIDocumentPickerViewController = {
  // For picked only folder
  let vc = UIDocumentPickerViewController(documentTypes: ["public.folder"], in: .open)
  // For picked every document
// let vc = UIDocumentPickerViewController(documentTypes: ["public.data"], in: .open)
  // For picked only images
// let vc = UIDocumentPickerViewController(documentTypes: ["public.image"], in: .open)
  vc.allowsMultipleSelection = false
// vc.accessibilityElements = [kFolderActionCode]
// vc.shouldShowFileExtensions = true
  vc.delegate = self
  return vc
  }()
  func makeUIViewController(context: UIViewControllerRepresentableContext<DocumentPicker>) -> UIDocumentPickerViewController {
  viewController.delegate = self
  return viewController
  }
  func updateUIViewController(_ uiViewController: UIDocumentPickerViewController, context: UIViewControllerRepresentableContext<DocumentPicker>) {
  }
}
extension DocumentPicker: UIDocumentPickerDelegate {
  func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt urls: [URL]) {
  print(urls)
  }
  func documentPickerWasCancelled(_ controller: UIDocumentPickerViewController) {
  controller.dismiss(animated: true) {
  }
  print("cancelled")
  }
}

This code popup a document picker in both iOS and MacOS using catalyst. With MacOS Catalyst work with

DocumentPicker

Class.

Cesare Piersigilli

1

Answer 2

cabreramouzo OP

Jul ’20

Hi Cesare, thank for your help. Where is

Code Block DocPickerViewController

class declarated? You use in

Code Block .sheet

statement, but I don't know where to declare this class.

0