How to use define macros iOS

Question

I need to make a define but if I use iPad or iPhone I need different values in this case.

So, as I think it should looks like this:

#ifdef UI_USER_INTERFACE_IDIOM == iPAD
#define ROWCOUNT 12
#else
#define ROWCOUNT 5
#endif

Is there some solution to get it?

Answer 1

UI_USER_INTERFACE_IDIOM is a macro that expands to some expression that checks the type of hardware at runtime, not at compile time. Thus you would want to change your definition of ROWCOUNT to be a variable rather than a const or macro.

NSUInteger rowCount;
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
    rowCount = 12;
else
    rowCount = 5;

or more concisely:

NSUInteger rowCount = (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) ? 12 : 5;