Question

I have question about global variable in Objective-C.

I have two .m files : file1.m and file2.m, and one .h file : file.h

I want to declare a global variable in .h and this variable has two different values defined by .m files.

I do this :

In .h file :

extern NSString * const myVar;

In file1.m :

NSString * const myVar = @"value 1";

In file2.m :

NSString * const myVar = @"value 2";

But it doesn’t link, I have error “duplicate symbols”.

I understand this error, but I can’t solve it to do what I want.

Any help ?

Answer 1

Do not declare it in the .h file, but declare it in each .m file where you use it (like now) and put “static” in front of the declaration

static NSString * const myVar = @"value 2";