Helper for JSON encode/decode custom class properties

NSObject+CSProperties.h

//
//  NSObject+CSProperties.h
//  Cheapshot
//
//  Created by Alexey Bukhtin on 17.02.14.
//  Copyright (c) 2014 Cheapshot. All rights reserved.
//

@interface NSObject (CSProperties)

- (NSArray *)classPropertyNames;
- (NSDictionary *)classPropertyValues;
- (NSDictionary *)classPropertyValuesExcludePropertyNames:(NSArray *)excludePropertyNames;
- (void)populateClassPropertiesWithData:(NSDictionary *)data;

@end

NSObject+CSProperties.m

//
//  NSObject+CSProperties.m
//  Cheapshot
//
//  Created by Alexey Bukhtin on 17.02.14.
//  Copyright (c) 2014 Cheapshot. All rights reserved.
//

#import <objc/runtime.h>
#import "NSObject+CSProperties.h"

@implementation NSObject (CSProperties)

- (NSArray *)classPropertyNames
{
    NSMutableArray *propertyNames = [NSMutableArray array];
    
    objc_property_t *properties = class_copyPropertyList([self class], NULL);
    for (objc_property_t *cursor = properties; *cursor != NULL; cursor++) {
        const char *property = property_getName(*cursor);
        
        if (property) {
            NSString *propertyName = [NSString stringWithCString:property encoding:[NSString defaultCStringEncoding]];
            [propertyNames addObject:propertyName];
        }
    }
    free(properties);
    
    return [propertyNames copy];
}

- (NSDictionary *)classPropertyValues
{
    return [self classPropertyValuesExcludePropertyNames:nil];
}

- (NSDictionary *)classPropertyValuesExcludePropertyNames:(NSArray *)excludePropertyNames
{
    NSMutableDictionary *classPropertyValues = [NSMutableDictionary dictionary];
    NSArray *classPropertyNames = [self classPropertyNames];
    
    [classPropertyNames enumerateObjectsUsingBlock:^(NSString *propertyName, NSUInteger idx, BOOL *stop) {
        if (!excludePropertyNames || ![excludePropertyNames containsObject:propertyName]) {
            id value = [self valueForKey:propertyName];
            
            if (value) {
                classPropertyValues[propertyName] = value;
            }
        }
    }];
    
    return [classPropertyValues copy];
}

- (void)populateClassPropertiesWithData:(NSDictionary *)data
{
    if (data && [data isKindOfClass:[NSDictionary class]] && data.count) {
        [data enumerateKeysAndObjectsUsingBlock:^(NSString *propertyName, id value, BOOL *stop) {
            if ([self respondsToSelector:NSSelectorFromString(propertyName)]) {
                [self setValue:value forKey:propertyName];
            }
        }];
    }
}

@end

TODO: NSDate value encode/decode and etc.