How to declare NSString constants for passing to NSNotificationCenter

Question

I\'ve got the following in my .h file:

#ifndef _BALANCE_NOTIFICATION
#define _BALANCE NOTIFICATION
const NSString *BalanceUpdateNotification
#endif
         


        

Answer 1

Apple has a recommendation in their own documentation, where among other things, the macro APPKIT_EXTERN is used instead of extern. Combined with the contents of a default header file when created in Xcode, this is a complete implementation:

Constants.h:

#import 

#ifndef Constants_h
#define Constants_h

APPKIT_EXTERN NSString *MyConstantName;

#endif

Constants.m:

#import "Constants.h"

NSString *MyConstantName = @"MyConstantValue";

I think the above is more or less the standard way to achieve string constants, according to Apple.