Objective-C preprocessor directive issues

Question

I have implemented this code for defining my constants:

#ifdef UI_USER_INTERFACE_IDIOM
#define IS_IPAD() (UI_USER_INTERFACE_IDIOM == UIUserInterfaceIdiomPad)
#else
#define IS_IPAD() (false)
#endif

#if (IS_IPAD)
CGFloat const scrollSizeWidth = 768.0f;
CGFloat const scrollSizeHeight = 1004.0f;
#else
CGFloat const scrollSizeWidth = 320.0f;
CGFloat const scrollSizeHeight = 460.0f;
#endif

But it always display 320.0f and 460.0f for my variables.

UPDATE: As k3a user found UI_USER_INTERFACE_IDIOM does not work for iOS 8.3, because it's not longer a define it's a static inline.

Check this answer as well: link

#ifdef UI_USER_INTERFACE_IDIOM is broken in Xcode 6.3+ as it is no longer a preprocessor define — k3a
– k3a, Commented Apr 26, 2015 at 14:44
Yup. I've noticed it as my app loaded iPhone nibs when compiled with Xcode 6.3+. Here is the new definition of that symbol: static inline UIUserInterfaceIdiom UI_USER_INTERFACE_IDIOM() { return ([[UIDevice currentDevice] respondsToSelector:@selector(userInterfaceIdiom)] ? [[UIDevice currentDevice] userInterfaceIdiom] : UIUserInterfaceIdiomPhone); } — k3a
– k3a, Commented Apr 26, 2015 at 16:59
@k3a yeah I think the solution we can use [[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) — Oleksandr Matrosov
– Oleksandr Matrosov, Commented Apr 28, 2015 at 8:19
yep, but the original code part "#ifdef UI_USER_INTERFACE_IDIOM" now doesn't work as UI_USER_INTERFACE_IDIOM is not a define but a function instead ;) mentioned it so the people know... — k3a
– k3a, Commented Apr 28, 2015 at 9:59

Paul R · Accepted Answer · 2012-07-18 11:57:42Z

3

Change:

#ifdef UI_USER_INTERFACE_IDIOM
#define IS_IPAD() (UI_USER_INTERFACE_IDIOM == UIUserInterfaceIdiomPad)
#else
#define IS_IPAD() (false)
#endif

to

#ifdef UI_USER_INTERFACE_IDIOM
#define IS_IPAD (UI_USER_INTERFACE_IDIOM == UIUserInterfaceIdiomPad)
#else
#define IS_IPAD (false)
#endif

answered Jul 18, 2012 at 11:57

Paul R

214k38 gold badges402 silver badges579 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Oleksandr Matrosov Over a year ago

sorry its work but now I get just 768.0f 1004.0f; I mean at any time

Some programmer dude · Accepted Answer · 2012-07-18 11:59:35Z

2

If UIUserInterfaceIdiomPad is not a preprocessor symbol, then it can't be used in preprocessor conditionals.

answered Jul 18, 2012 at 11:59

Some programmer dude

411k36 gold badges420 silver badges655 bronze badges

Collectives™ on Stack Overflow

Objective-C preprocessor directive issues

2 Answers 2

1 Comment

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related