使用Objective-C签名文件（iOS / Mac）

Question

My application create,export and import files, to know if an imported file is mine, i use an extension but this is not enough, so i add a string (as data) to the file to detect it, but again i think that is not the right way to do it.

can you tell me if there's a way on objective-c do that?

Answer 1

Sounds like a job for Uniform Type Identifiers . The UTI mechanism provides the ability to identify different types of data based on different criteria.