Objective-C : #define vs extern const

Question

I know this question has been asked before, but I can\'t seem to find information about it in Apple\'s documentation; maybe some of you guys did.

A lot of Objective-C co

Answer 1

The trouble with using #defines over an extern, is that the compiler doesn't get to do any type checking. If you #define a string, there is nothing to stop you using it where you actually want, say, a number. If you use a static NSString instead, the compiler will emit a warning if you try to use it somewhere where it isn't expecting a string.