Reading and writing files in iphone application

I'm new to writing iPhone applications. I'm writing an application to read and write all kinds of text and image files. I have read that an iPhone application can only read and write read from files in their sandboxed tmp and documents folders.

Is there 开发者_高级运维a common folder in iPhone to place files so that they can be read by any other application?

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AFAIK there is no such "common folder". However, from Apple's docs:

To share files between applications, use a document interaction controller object.

Not sure if that's what you want, but it seems like the closest you can get. More info here.