Constants in Objective-C and “duplicate symbol” linker error

Question

I\'ve declared a constant with the same name in some different classes, in their .m file, this way:

@implementation MyViewController
const NSInt         


        

Answer 1

If you want to use constant only in one .m file then declare it as static. For example:static NSString * const CONSTANT_STRING = @"Constant I am".

In case of NSInteger you can write in your every .m file:

static const NSInteger my_const = 3;

If you want globals (one constant with one value visible in every file) then write in your .h:

extern const NSInteger my_global_const;

and in your .m file you can add

const NSInteger my_global_const = 5;