Question

I have a define:

hashdefine kPingServerToSeeIfInternetIsOn  "http://10.0.0.8"

then in code I with to use it:

NSString *theURL = [NSString stringWithFormat:@"%@", kPingServerToSeeIfInternetIsOn];

I get an exception.

What’s the best way to define the const for the application and use it in a NSString init?

Answer 1

Create a header file, e.g. MyAppConstants.h. Add the following:

extern NSString * const kPingServerToSeeIfInternetIsOn;

In the definition, e.g. MyAppConstants.m, add:

NSString * const kPingServerToSeeIfInternetIsOn = @"http://10.0.0.8";

In your class implementation, add:

#import "MyAppConstants.h"

You can use the constant as you have done already.