NSJSONReadingMutableContainers	// 返回可变容器，NSMutableDictionary或NSMutableArray
NSJSONReadingMutableLeaves			// 不仅返回的最外层是可变的, 内部的子数值或字典也是可变对象
NSJSONReadingAllowFragments		// 返回允许JSON字符串最外层既不是NSArray也不是NSDictionary，但必须是有效的JSON Fragment.可以是例如 "10"

NSJSONWritingPrettyPrinted = (1UL << 0) //是将生成的json数据格式化输出，这样可读性高，不设置则输出的json字符串就是一整行。
NSJSONWritingSortedKeys //输出的json字符串就是一整行

#import <MCJSONKit/MCJSONKit.h>

#import "MCJSONKit.h"

#import <MCJSONKit/MCJSONKit.h>

//示例基础模型
@interface YourBaseJSONModel : NSObject

/**
 通过字典创建模型
 
 @param data 许可类型<NSData,NSDictionary,NSString>
 @return 新创建模型对象
 
 */
+ (instancetype)jsonObjectFromData:(id)data;
+ (NSArray *)arrayOfModelsFromKeyValues:(id)keyValues;

/**
 允许的属性集合，配置后则ignoreSet失效
 */
- (NSSet *)allowedPropertyNames;

/**
 忽略的属性集合
 */
- (NSSet *)ignoreSet;

/**
 key关联字段
 
 @return key:对象属性 value:keyPath
 */
- (NSDictionary *)keyMappingDictionary;

/**
 类型关联字典
 
 @return key:对象属性   value:类型class
 */
- (NSDictionary *)typeMappingDictionary;
- (NSDictionary *)toDictionary;
- (NSString *)toJSONString;

@end

#import "YourBaseModel.h"

#import "NSObject+MCJSONKit.h"
#import "MJExtension.h"

@implementation YourBaseModel

+ (void)load {
    //格式化输出JSON字符串，默认为NO
    [self setPrettyPrinted:YES];
}
    
- (void)setCreated_at:(NSString *)created_at {
    NSDateFormatter *dateFmt = [NSDateFormatter new];
    dateFmt.dateFormat = @"EEE MMM d HH:mm:ss Z yyyy";
    dateFmt.locale = [NSLocale localeWithLocaleIdentifier:@"en-US"];
    
    NSDate *date = [dateFmt dateFromString:created_at];
    _created_at = @(date.timeIntervalSince1970).stringValue;
}

#pragma mark - 二次封装JSONKit

+ (instancetype)jsonObjectFromData:(id)data {
    return [self mc_objectFromKeyValues:data];
}

+ (NSArray *)arrayOfModelsFromKeyValues:(id)keyValues {
    return [self mc_arrayOfModelsFromKeyValues:keyValues];
}

- (NSSet *)allowedPropertyNames {
    return nil;
}

- (NSDictionary *)keyMappingDictionary {
    return nil;
}

- (NSDictionary *)typeMappingDictionary {
    return nil;
}

- (NSSet *)ignoreSet {
    return nil;
}

- (NSDictionary *)toDictionary {
    return [self mc_toDictionary];
}

- (NSString *)toJSONString {
    return [self mc_JSONString];
}

#pragma mark JSONCoreConfig

- (NSSet *)mc_allowedPropertiesSet {
    return [self allowedPropertyNames];
}

- (NSDictionary *)mc_keyMappingDictionary {
    return [self keyMappingDictionary];
}

- (NSDictionary *)mc_typeMappingDictionary {
    return [self typeMappingDictionary];
}

- (NSSet *)mc_ignorePropertiesSet {
    return [self ignoreSet];
}

@end

@interface CountryModel : YourBaseModel
@property (nonatomic) NSInteger id;
@property (nonatomic) NSString *country;
@property (nonatomic) NSString *dialCode;
@property (nonatomic) BOOL isInEurope;
@end

CountryModel *country = [CountryModel jsonObjectFromData:jsonString];

@interface ProductModel : YourBaseModel
@property (nonatomic) NSInteger productId;
@property (nonatomic) NSString *name;
@property (nonatomic) float price;
@end

@interface OrderModel : YourBaseModel
@property (nonatomic) NSInteger orderId;
@property (nonatomic) float totalPrice;
@property (nonatomic, assign) int status;
@property (nonatomic) NSArray<ProductModel *> *products;
@end

@implementation ProductModel
- (NSDictionary *)keyMappingDictionary {
    return @{MCProperty(productID):@"id"};
} 
@end

@implementation OrderModel
- (NSDictionary *)keyMappingDictionary {
    return @{MCProperty(status):@"status.code"};
} 
@end

//模型中有个数组属性，数组元素映射为其他模型
- (NSDictionary *)typeMappingDictionary {
    return @{MCProperty(products):[ProductModel class]};
}