回答: 具体文档见这里： https://dev 由 斷╱╄嶂掫義 于 2017-06-14 8:15

In iOS 11 and later, the file provider must enumerate its contents, provide additional information about the contents, and handle standard user actions (for example, delete, rename, and move). With these features, the system can provide a standard user interface for browsing your file provider's content.

In iOS 10 and earlier, the file provider was only half of the Document Provider extension. It acted as the back end, ensuring that all the URLs returned by the Document Provider were backed by files on disk. 

这就表示iOS 10之前就已经有iOS 11的一半功能？
换句话说iOS 11 FileProvider一半的架构源自于iOS 10之前的，
全新什么？