CODEWITHSUNDEEP
iosobjective-c
HIEU
HIEU

Reputation: 25

How to call the define variable in another file

I have a define variable is a string like this 

#define kyouTubeLink  @"<iframe width='%d' height='%d' src='http://www.youtube.com/embed/%@?showinfo=0&modestbranding=1&rel=0&showsearch=0' frameborder='0' scrolling='0' allowfullscreen></iframe>";

so how to call this variable in another file.Thanks in advance

Upvotes: 0

Views: 42

Answers (1)

Sergey Kalinichenko
Sergey Kalinichenko

Reputation: 726609

You cannot reference a variable that is #define-d in another translation unit. You can put the definition in a header file, and #include it from any translation unit that needs the definitions.

Since the definition is a C string literal, though, you would be better off defining a constant extern variable for it, putting the declaration in a header, defining it in one of your translation units, and using everywhere else:

Common header (say, "YouTubeShared.h"):

extern const NSString* kyouTubeLink;

First translation unit (e.g. "AppDelegate.m" or whatever is a file that is better suited to hold the constant)

#include "YouTubeShared.h"
const NSString *kyouTubeLink = @"<iframe width='%d' height='%d' src='http://www.youtube.com/embed/%@?showinfo=0&modestbranding=1&rel=0&showsearch=0' frameborder='0' scrolling='0' allowfullscreen></iframe>";
... // More things go here

Second translation unit:

#include "YouTubeShared.h"
... // More things go here
NSString *res = [NSString stringWithFormat:kyouTubeLink, 123, 456];

Upvotes: 1

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