问题
I was not able to find on Apple iOS SDK information regarding which directories are writable and which are not for your application.
I only assume that NSCachesDirectory and NSDocumentDirectory are writable but how about others, like NSApplicationSupportDirectory or NSTemporaryDirectory.
Where can I find a complete list of common directories with their purpose and if they are writable or not by my application?
I was able to locate possible values for NSSearchPathDirectory enum but they do not contain any information regarding their purpose and more important if you are able to write to them.
回答1:
Have a look in the "iOS Application Programming Guide" > The Application Runtime Environment > The File System > A Few Important Application Directories.
There are several useful links on the same page to methods that will help or to further FS related documentation.
来源：https://stackoverflow.com/questions/5328398/what-are-the-directory-locations-that-are-writable-on-ios