问题
In Xcode, under Info tab, what's Role dropdown in URL Types section for? The valid value for this is Editor, Viewer, None.
回答1:
It represents what your app can do with the URL / file type.
- Editor == read and write.
- Viewer == read only.
- None == can't use at all.
This flag isn't used by iOS.
来源：https://stackoverflow.com/questions/16598352/in-xcode-under-info-tab-whats-role-for-in-url-types-section