easy macros for ObjC properties in categories using AssociativeStorage!

AssociativeStorage

//got from stackoverflow - quite nice :)
//http://stackoverflow.com/questions/8870197/adding-properties-to-uiviewcontroller-and-all-its-subclasses
#ifndef ASSOCIATED_STORAGE_PROPERTY_IMP
#define THREE_WAY_PASTER_INNER(a, b, c) a ## b ## c
#define THREE_WAY_PASTER(x,y,z) THREE_WAY_PASTER_INNER(x,y,z)

#define ASSOCIATED_STORAGE_PROPERTY_IMP(type, setter, getter, policy) \
static void * const THREE_WAY_PASTER(__ASSOCIATED_STORAGE_KEY_, getter, __LINE__) = (void*)&THREE_WAY_PASTER(__ASSOCIATED_STORAGE_KEY_, getter,__LINE__); \
\
- (type)getter { return objc_getAssociatedObject(self, THREE_WAY_PASTER(__ASSOCIATED_STORAGE_KEY_, getter,__LINE__) ); } \
\
- (void)setter: (type)value { objc_setAssociatedObject(self, THREE_WAY_PASTER(__ASSOCIATED_STORAGE_KEY_, getter,__LINE__) , value, policy); } \

#endif

//===

#import <objc/runtime.h>

@interface UIViewController (SOAdditions)

@property (atomic, readwrite, copy) NSString* myProperty;

@end

@implementation UIViewController (SOAdditions)

ASSOCIATED_STORAGE_PROPERTY_IMP(NSString*, setMyProperty, myProperty, OBJC_ASSOCIATION_COPY)

@end