Pre-processor directive to detect iPad

Question

I declare some constants in a header file which need to be different depending on whether it is an iPad or an iPhone app. How would I do this?

i.e.

#ifdef ISIPAD
static NSString myconst = @"ipad!";
#else
static NSString myconst = @"iphone!";
#endif

Answer 1

If you're writing an universal app, you can't do a compile time check since the compiler generates one executable for both the iPhone and the iPad. If you've got separate apps for iPhone and iPad (with a shared codebase), why not just #define ISIPAD appropriately yourself. Otherwise, you have to do a check at runtime.

You could make them global variables that get initialized when your app starts up by checking to see which device you're running on then setting them appropriately.