问题
The App Sandbox Guide teaches us to use a key NSIsRelatedItemType in the Info.plist file to designate "Related Items", such as sidecar files, that the app should be able to access (given the proper use of NSFileCoordinator, which works great on macOS).
However, the Information Property List Key Reference for CFBundleDocumentTypes does not have any documentation for NSIsRelatedItemType. Other keys, which are documented, are variously available on macOS and iOS.
Is NSIsRelatedItemType available on iOS?
If not, is there an alternative to this approach that works on iOS? Because, for me, currently it isn't. 😭
来源：https://stackoverflow.com/questions/59583785/is-nsisrelateditemtype-available-on-ios