How to declare and use NSString global constants [duplicate]

Answer 1

First, you should go for a real extern C symbol -- not a macro. this is done like so:

SomeFile.h

extern NSString *const MONConstantString;

SomeFile.m

NSString *const MONConstantString = @"MONConstantString";

note that if you use a mix of ObjC and ObjC++, you will need to specify extern "C" for C++ TUs -- that's why you will see a #defined export which varies by language.

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Then, you will want to put the constant near the interfaces it relates to. Taking your example as a lead, you might want a set of interfaces or declarations for your app's preferences. In that case, you might add the declaration to MONAppsPreferences header:

MONAppsPreferences.h

extern NSString *const MONApps_Pref_ReminderSwitch;

MONAppsPreferences.m

NSString *const MONApps_Pref_ReminderSwitch = @"MONApps_Pref_ReminderSwitch";

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In use:

#import "MONAppsPreferences.h"
...
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:MONApps_Pref_ReminderSwitch];