highlight key values

@interface UIImageView (highlighted)
@property (nonatomic, strong) NSMutableDictionary *highlightedKV;
@property (nonatomic, strong) NSMutableDictionary *unhighlightedKV;
@end
@implementation UIImageView (highlighted)
-(NSMutableDictionary *)highlightedKV {
    id returnValue = objc_getAssociatedObject(self, "highlightedKVKey");
    if (!returnValue) {
        returnValue = [NSMutableDictionary dictionary];
        [self setHighlightedKV:returnValue];
    }
    return returnValue;
}
-(void)setHighlightedKV:(NSMutableDictionary *)hkv {
    objc_setAssociatedObject(self, "highlightedKVKey", hkv, OBJC_ASSOCIATION_RETAIN);
}
-(NSMutableDictionary *)unhighlightedKV {
    id returnValue = objc_getAssociatedObject(self, "unhighlightedKVKey");
    if (!returnValue) {
        returnValue = [NSMutableDictionary dictionary];
        [self setUnhighlightedKV:returnValue];
    }
    return returnValue;
}
-(void)setUnhighlightedKV:(NSMutableDictionary *)hkv {
    objc_setAssociatedObject(self, "unhighlightedKVKey", hkv, OBJC_ASSOCIATION_RETAIN);
}
-(void)setHighlightedValue:(id)value forKey:(NSString *)key {
    NSMutableDictionary *kv = [self highlightedKV];
    kv[key] = value;
}
-(void)NEWsetHighlighted:(BOOL)highlighted {
    NSMutableDictionary *kv = [self highlightedKV];
    NSMutableDictionary *ukv = [self unhighlightedKV];
    if ([self isHighlighted] == NO) {
        for (NSString *key in kv) {
            ukv[key] = [self valueForKey:key];
        }
    }
    [self NEWsetHighlighted:highlighted];//thanks to swizzling this is not a loop.
    NSMutableDictionary *loopDict = highlighted ? kv : ukv;
    for (NSString *key in loopDict) {
        [self setValue:loopDict[key] forKey:key];
    }
}
+(void)load {
    Method meth1 = class_getInstanceMethod([UIImageView class], @selector(setHighlighted:));
    Method meth2 = class_getInstanceMethod([UIImageView class], @selector(NEWsetHighlighted:));
    method_exchangeImplementations(meth1, meth2);
}
@end