iOS preprocessor constants

gistfile1.m

#define DOCUMENTS_PATH  [NSHomeDirectory() stringByAppendingString:@"/Documents/"]

#ifdef DEBUG
#   define DLog(fmt, ...) NSLog((@"%s [Line %d] " fmt), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__);
#else
#   define DLog(...)
#endif

// ALog always displays output regardless of the DEBUG setting
#define ALog(fmt, ...) NSLog((@"%s [Line %d] " fmt), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__);

#define isIPad2 (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad && [UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera])