I'm trying to export my UIDocument subclass with a UIDocumentPickerViewController. The subclass writes data to a FileWrapper and its UTI conforms to com.apple.package.
But the presented document picker shows "Documents in iCloud Drive are not available because the iCloud Drive setting is disabled."
The document is successfully written to the cache, as I can see from the exported container package.
When I change the document subclass and custom UTI to conform to a single file (e.g. public.plain-text), the document picker works fine and I can export the file. So the problem seems to be with the Document Type or Exported UTI.
Am I doing something wrong or is this a bug?
Info.plist
<key>CFBundleDocumentTypes</key>
<array>
<dict>
<key>CFBundleTypeIconFiles</key>
<array/>
<key>CFBundleTypeName</key>
<string>Custom Doc</string>
<key>LSHandlerRank</key>
<string>Owner</string>
<key>LSItemContentTypes</key>
<array>
<string>com.zxzxlch.documentsandbox.customdoc</string>
</array>
<key>LSTypeIsPackage</key>
<true/>
</dict>
</array>
...
<key>UTExportedTypeDeclarations</key>
<array>
<dict>
<key>UTTypeConformsTo</key>
<array>
<string>com.apple.package</string>
</array>
<key>UTTypeDescription</key>
<string>Custom Doc File</string>
<key>UTTypeIdentifier</key>
<string>com.zxzxlch.documentsandbox.customdoc</string>
<key>UTTypeTagSpecification</key>
<dict>
<key>public.filename-extension</key>
<array>
<string>zzz</string>
</array>
</dict>
</dict>
</array>
CustomDocument.swift
private let textFilename = "contents.txt"
class CustomDocument: UIDocument {
var content = "Test"
override func load(fromContents contents: Any, ofType typeName: String?) throws {
guard let topFileWrapper = contents as? FileWrapper,
let textData = topFileWrapper.fileWrappers?[textFilename]?.regularFileContents else {
return
}
content = String(data: textData, encoding: .utf8)!
}
override func contents(forType typeName: String) throws -> Any {
let textFileWrapper = FileWrapper(regularFileWithContents: content.data(using: .utf8)!)
textFileWrapper.preferredFilename = textFilename
return FileWrapper(directoryWithFileWrappers: [textFilename: textFileWrapper])
}
}
ViewController.swift
func exportDocument() {
// Write to cache
let cachesDir = FileManager.default.urls(for: FileManager.SearchPathDirectory.cachesDirectory, in: .allDomainsMask).first!
let dataDir = cachesDir.appendingPathComponent("export", isDirectory: true)
try! FileManager.default.createDirectory(at: dataDir, withIntermediateDirectories: true, attributes: nil)
let fileURL = dataDir.appendingPathComponent("cookie").appendingPathExtension("zzz")
let archive = CustomDocument(fileURL: fileURL)
archive.content = "Cookie cat"
archive.save(to: archive.fileURL, for: .forCreating) { success in
guard success else {
let alertController = UIAlertController.notice(title: "Cannot export data", message: nil)
self.present(alertController, animated: true, completion: nil)
return
}
let documentPicker = UIDocumentPickerViewController(url: archive.fileURL, in: .exportToService)
documentPicker.delegate = self
self.present(documentPicker, animated: true, completion: nil)
}
}