Question

I am sure that this probably something extremely easy (or it can’t be done), but I can’t seem to find anything on it.

In one of my classes .h file I need to determine if the app is running on an iPad or an iPhone. Then change the value of the #define accordingly.

Ideally I would this it would look something like this:

#if UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone

#define deltaX 10.0
#define theda  15.0
#define threshHold 267.0

#endif

#if UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad

#define deltaX 78.1
#define theda  67.2
#define threshHold 453.0

#endif

I am not sure what to use, any help would be very much appreciated.

Thank you for your time!

Answer 1

Sadly, you can’t do this, as in a universal app the same code runs on iPhone as on iPad, so this decision must be made at run-time, not compile-time.

You should declare these variables in a header file, and then set them at run time depending on the value of UI_USER_INTERFACE_IDIOM().