ios - Proper declaration of global C-constants in Objective-C -

i'm trying declare , initialize global c-variables.

const int numberoftickmarks = 6; const double tickvalues[numberoftickmarks] = {500, 2000, 3000, 4000, 6000, 8000}; 

when in header file (before @interface), linker error. when in .m file (before @implementation), things seem work desired.

is latter accepted way declare global constants c/objective-c?

your global variables should declared in header file:

extern const int numberoftickmarks; extern const double tickvalues[numberoftickmarks]; 

without extern, linker errors inevitable.

in implementation file, have define them again this:

const int numberoftickmarks = 6; const double tickvalues[numberoftickmarks] = {500, 2000, 3000, 4000, 6000, 8000};