I thought UIDocumentBrowserViewController was pretty cool until I realized that there is no "On My iPad / iPhone" category (even though Apple's videos seem to imply that there is one). This thing is iCloud only. If the user switches off iCloud Drive, your documents vanish and there's no Create button, so your app becomes a pointless brick.
Please prove to me that I'm wrong about this.
Okay, some further experimentation shows that even in a UIDocumentBrowserViewController app you can in fact turn on "Application supports iTunes file sharing" and "Supports opening documents in place" and now you can browse your _local_ files in the Documents folder with your app's file browser, and this works even if iCloud Drive is off. But then I don't quite understand why Apple says "or", as if they were exclusive.
