Where to store global constants in an iOS application?

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Well, you want the declaration local to the interfaces it relates to — the app-wide constants file is not a good thing.

As well, it’s preferable to simply declare an extern NSString* const symbol, rather than use a #define:

SomeFile.h

extern NSString* const MONAppsBaseUrl;

SomeFile.m

#import "SomeFile.h"

#ifdef DEBUG
NSString* const MONAppsBaseUrl = @"http://192.168.0.123/";
#else
NSString* const MONAppsBaseUrl = @"http://website.example/";
#endif

Apart from the omission of the C++ compatible Extern declaration, this is what you will generally see used in Apple’s Obj-C frameworks.

If the constant needs to be visible to just one file or function, then static NSString* const baseUrl in your *.m is good.

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