How to declare and use NSString global constants [duplicate]

Answer 1

Your thought is right I think. For example, I made Const.h/m file like below:

Const.h

extern NSString *const UserIdPrefKey;
extern NSString *const PasswordPrefKey;
extern NSString *const HomepagePrefKey;

Const.m

#import "AEConst.h"

NSString *const UserIdPrefKey = @"UserIdPrefKey";
NSString *const PasswordPrefKey = @"PasswordPrefKey";
NSString *const HomepagePrefKey = @"UrlHomepagePrefKey";

Only Const.h must be imported.

When you write code, Xcode supports writing the key name so that you can avoid miss-typing.