iphone - question regarding global variable -

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I need to use all other files to access 1 variable in all the files in NSString's 1 I can use the object

This is a vague question.

If I understand correctly, in that case, you have a global NSString * shared by multiple files, in one of the source files ( .m ), 

  NSString * my_global_string = @ "...";

and all other source files (or a common .h ), insert 

  extern NSString * my_global_string;

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