How to use #define variable as method parameter in objective C

Question

I'm pretty new to Objective-C and what I want to do is have define variables in the EntityNameConstants.h file where I store all the Entity Names.

And the I will use all the defines in repository for all the methods related to the ManagedObjectContext.

EG. This is in the .h file

define ENTITY_USER_PICTURE = @"UserPicture"

and in repository i want to use this constants as following

UserPicture *userPicture = (UserPicture *)[NSEntityDescription insertNewObjectForEntityForName:ENTITY_USER_PICTURE
                                                                            inManagedObjectContext:context];

but I cannot do this, it gives me Parse Issue error.

Am I doing anything wrong in here?

Did you put the hash (#) before define? Can you paste the output error? — pasine
– pasine, Commented Nov 26, 2013 at 0:38
Keep in mind that Objective-C is "C", it is a strict superset. Everything that works in "C" also works in Objective-C. — zaph
– zaph, Commented Nov 26, 2013 at 0:42
There's really no good reason to use a define rather than a const string for that purpose. — Jesse Rusak
– Jesse Rusak, Commented Nov 26, 2013 at 0:46
Hi the syntax for define is #define ENTITY_USER_PICTURE @"UserPicture". and Hi Jesse i see what you are saying but in that case for const i need .h and .m file where i have only .h file where i declare only #define. so i don't want to introduce new class for constants. is there any alternative? — Nikita255
– Nikita255, Commented Nov 29, 2013 at 2:06

Holly · Accepted Answer · 2013-11-26 00:38:53Z

5

The correct syntax for a define is:

#define VARIABLE @"value"

answered Nov 26, 2013 at 0:38

Holly

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2 Comments

Holly Over a year ago

Note: there is no equal sign.

Nikita255 Over a year ago

Sorry the syntax is #define ENTITY_USER_PICTURE @"UserPicture" i wnat to use this as variable a parameter insertNewObjectForEntityForName

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