Detect if document is shared in iCloud Drive

Number:rdar://47406322 Date Originated:19 Jan 2019
Status:Open Resolved:
Product:iOS Foundation Product Version:
Classification:Suggestion Reproducible:
Users can share the documents of a document-based app, if they are stored in iCloud Drive, using the Files app, `UIDocumentBrowserViewController`, `UIDocumentPickerViewController` or the `UIActivityViewController`.

*It would be great if the app could detect whether a particular file is shared and ideally, with whom.* This would allow the app to present custom UI indicators to show what files are shared and which are private to the user.

An appropriate place for this could be through `NSFileManager` or a convenience method in `UIDocument`.


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