I'm just wondering due to new personal project which is the limit (in MB or GB) of documents directory of my app. I just wanna save a lot of photos, so, has documents directory a limit for archiving downloaded photos? Will saving 300MB of photos produce slow downs on 3G? If there is no limit, I think that limit shoud be the 8 16 32 GB of the iPhone, are there any method to know the free space?
According to a discussions.apple.com: There is a limit of 2 GB.
https://discussions.apple.com/message/7599983?messageID=7599983#7599983?messageID=7599983
Files in the document directory stay there permanently until the app is removed.
来源：https://stackoverflow.com/questions/3214644/iphone-documents-directory-maximum-size