iOS中的NSCachesDirectory和NSDownloadsDirectory有什么区别？

Question

I want to save downloaded magazines to one directory in my iOS app. It seems NSCachesDirectory and NSDownloadsDirectory are suitable. I don't know the difference between them and which one is suitable for downloading magazines. Any suggestions are appreciated.

Answer 1

NSCachesDirectory can be deleted in cases of low memory

If you don't want your files to be deleted you have to store them in the Documents directory, but add "do not backup" if you don't want your files to be backed by iTunes, iCloud etc..

Please look at the apple's File System Programming Guide or File System Basics

Answer 2

我更喜欢NSCachesDirectory或临时目录来保存文件，因为对于NSDownloadsDirectory或文档目录，你必须使用不备份或iCloud超过iOS 5.因为iOS 5.0不允许在文档目录中保存任何数据，它是拒绝app商店的主要原因。