iOS11 UIDocumentPickerViewController does nothing after selecting an attachement

Hey folks! iOS engineer @ Dropbox here.

Please do update to the 64.3 version that is in the AppStore -- it has the full iOS 11 experience and should alleviate the issues you're seeing. If you have trouble seeing your files, make sure you launch the main Dropbox app once and ensure you're logged in, and you should see your Dropbox in Files. If not, try force killing and relaunching Files. We're pretty certain this is rare edge-case and will continue to make this better in future releases!

To domhof:

I'm sorry this might be a bit off-topic: Have you found a fix for this in your UIDocumentPickerExtensionViewController? I'm updating an app which has a working UIDocumentPickerExtensionViewController for iOS 10 but in iOS 11 I get the exact same error message in the client-app's console.

There is an issue in iOS 11.0 that is caused by an mismatch in the Document Picker's Info.plist. If you do not have a File Provider Extension, ensure that you only support the Import and ExportToService types, as reporting Open or Move without an associated File Provider Extension will cause your extension to behave incorrectly. It's possible that this will be fixed in a future iOS update -- but consider just removing those keys if you have them. Hope this helps!

Thanks,

Jeff

Hello,

Grateful for this thread here.

Thanks for the new update today. I had noticed Dropbox export/import stopped working with iOS 11 using UIDocumentPickerController, due to the “0 urls” issue. With 64.3 it works again.

Had to reinstall the Dropbox app though, just updating it wasn’t enough.

Best,

Sven

@CC_JF

I had the same problem (I'm the developer of AudioShare), however I already had only Import and ExportToService types in my Document Picker's Info.plist.

Instead I had to implement a new File Provider extension, and this kind of works now. The user can interact with all my documents as expected in the Files app. However, I still get the same behavior when trying to import into an app! (no URLs passed, doc picker cancelled). Any special magic you had to do? Please let me know! (mail me at info kymatica com if this is too off topic here)

@Maple @CC_JF @kymatica

Thanks for your help! I can confirm that in iOS 11 UIDocumentPickerExtensionViewController only works when a NSFileProviderExtension is present (at least I didn't find any other way, even with only UIDocumentPickerModeImport).

Moreover the Files app seems to ignore my UIDocumentPickerModes setting in the UIDocumentPickerExtensionViewController's Info.plist! Even if I remove the setting completly, the Files app still shows my UIDocumentPickerExtensionViewController. While at the same time, e.g. in Whatsapp the UIDocumentPickerExtensionViewController, correctly, doesn't show up anymore. The Files app then opens it in UIDocumentPickerModeOpen mode. I can even load and edit (!) the files (photos).

I need to find a way to keep the Files app from opening my UIDocumentPickerExtensionViewController in open-mode despite the mode being not supported. The files may not be edited. Alternatively the edited version should be stored as a new file.

I think this might even be the root cause of the problem. That the Files App always opens the UIDocumentPickerExtensionViewController in open-mode and therefore a FileProvider is needed, even the Info.plist states only import as supported mode.

@kymatica I'll write you via mail. I guess this now goes into too much detail for this forum. :)