objective c - #if for device detection in iPhone SDK -

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i'm curious why code won't work:

#if ui_user_interface_idiom//() == uiuserinterfaceidiompad @implementation uinavigationbar (custom height)  - (cgsize)sizethatfits:(cgsize)size {     cgsize newsize = cgsizemake(self.frame.size.width,44+breadcrumbbarheight-1);     return newsize; }      @end #endif

any ideas?

ui_user_interface_idiom() macro designed (and defined) runtime evaluation! using compile-time evaluation fail.

it defined as:

#define ui_user_interface_idiom() ([[uidevice currentdevice] respondstoselector:@selector(userinterfaceidiom)] ? [[uidevice currentdevice] userinterfaceidiom] : uiuserinterfaceidiomphone)

the call [uidevice.. fail @ compile-time evaluation


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