Question

Possible Duplicate:
Xcode duplicate symbol error

I have a Constant.h file that stores my constants strings. But when I try to add Constant.h file to two different classes (using #import "Constant.h") I got error with duplicate symbol. How can I use this file in different classes without duplicate symbol error?

Answer 1

You’re declaring the constant wrong. The right approach for NSString constants is:

extern NSString *const ConstantName; // in Constant.h
NSString *const ConstantName = @"ConstantName"; // in Constant.m

See also this question and related ones.