问题
I would like to know whether the Cache directory gets deleted when upgrading iOS?
回答1:
There are no clear answer for this in the documentation. It can be purged when the device gets low on disk space or performing a full restoration.
Application_Home/Library/Caches
Use this directory to write any application-specific support files that you want to persist between launches of the application or during application updates. Your application is generally responsible for adding and removing these files. It should also be able to re-create these files as needed because iTunes removes them during a full restoration of the device.
来源：https://stackoverflow.com/questions/14301985/does-cache-directory-gets-deleted-when-upgrading-ios