UIDocumentBrowserViewController.allowsPickingMultipleItems is not fine-grained enough

Number:rdar://32846182 Date Originated:19-Jun-2017 12:08 PM
Status:Open Resolved:
Product:iOS + SDK Product Version:iOS 11b1
Classification:Enhancement Reproducible:Always
We can customize, whether the document browser allows to pick multiple items or not by specifying `allowsPickingMultipleItems`. We can also specify whether custom UIDocumentBrowserActions can work on multiple items or not by specifying `supportsMultipleItems`. We can however not specify, whether our app supports opening of multiple documents. What we want is to configure UIDocumentBrowserViewController in a way that it allows to pick multiple items, but only open a single document.

Steps to Reproduce:
1. Open the attached DocumentBrowser-based app
2. create 2 new documents
3. tap on select
4. select both

Expected Results:
The "open" button is disabled

Actual Results:
The "open" button is enabled and there’s no way to disable it

iOS 11b1



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