详细轻参考：https://github.com/CoderMJLee/MJExtension 功能很牛掰
能做什么？
MJExtension是一套
字典和模型之间互相转换的超轻量级框架MJExtension能完成的功能
字典（JSON）-->模型（Model）模型（Model）-->字典（JSON）字典数组（JSON Array）-->模型数组（Model Array）模型数组（Model Array）-->字典数组（JSON Array）详尽用法主要参考 main.m中的各个函数 以及
NSObject+MJKeyValue.h
MJExtension和JSONModel、Mantle等框架的区别
转换速率：
最近一次测试表明：
MJExtension>JSONModel>Mantle各位开发者也可以自行测试
具体用法：
JSONModel：要求所有模型类必须继承自JSONModel基类Mantle：要求所有模型类必须继承自MTModel基类MJExtension：不需要你的模型类继承任何特殊基类，毫无污染，毫无侵入性
如何使用MJExtension
cocoapods导入：
pod 'MJExtension'手动导入：
将
MJExtensionExample/MJExtensionExample/MJExtension文件夹中的所有源代码拽入项目中导入主头文件：
#import "MJExtension.h"
MJExtension.h
MJConst.h MJConst.m
MJFoundation.h MJFoundation.m
MJIvar.h MJIvar.m
MJType.h MJType.m
NSObject+MJCoding.h NSObject+MJCoding.m
NSObject+MJIvar.h NSObject+MJIvar.m
NSObject+MJKeyValue.h NSObject+MJKeyValue.m最简单的字典转模型
typedef enum {
SexMale,
SexFemale
} Sex;
@interface User : NSObject
@property (copy, nonatomic) NSString *name;
@property (copy, nonatomic) NSString *icon;
@property (assign, nonatomic) int age;
@property (assign, nonatomic) double height;
@property (strong, nonatomic) NSNumber *money;
@property (assign, nonatomic) Sex sex;
@end
NSDictionary *dict = @{
@"name" : @"Jack",
@"icon" : @"lufy.png",
@"age" : @20,
@"height" : @"1.55",
@"money" : @100.9,
@"sex" : @(SexFemale)
};
// 将字典转为User模型
User *user = [User objectWithKeyValues:dict];
NSLog(@"name=%@, icon=%@, age=%d, height=%@, money=%@, sex=%d",
user.name, user.icon, user.age, user.height, user.money, user.sex);
// name=Jack, icon=lufy.png, age=20, height=1.550000, money=100.9, sex=1核心代码
[User objectWithKeyValues:dict]
模型中嵌套模型
@interface Status : NSObject
/** 微博文本内容 */
@property (copy, nonatomic) NSString *text;
/** 微博作者 */
@property (strong, nonatomic) User *user;
/** 转发的微博 */
@property (strong, nonatomic) Status *retweetedStatus;
@end
NSDictionary *dict = @{
@"text" : @"是啊，今天天气确实不错！",
@"user" : @{
@"name" : @"Jack",
@"icon" : @"lufy.png"
},
@"retweetedStatus" : @{
@"text" : @"今天天气真不错！",
@"user" : @{
@"name" : @"Rose",
@"icon" : @"nami.png"
}
}
};
// 将字典转为Status模型
Status *status = [Status objectWithKeyValues:dict];
NSString *text = status.text;
NSString *name = status.user.name;
NSString *icon = status.user.icon;
NSLog(@"text=%@, name=%@, icon=%@", text, name, icon);
// text=是啊，今天天气确实不错！, name=Jack, icon=lufy.png
NSString *text2 = status.retweetedStatus.text;
NSString *name2 = status.retweetedStatus.user.name;
NSString *icon2 = status.retweetedStatus.user.icon;
NSLog(@"text2=%@, name2=%@, icon2=%@", text2, name2, icon2);
// text2=今天天气真不错！, name2=Rose, icon2=nami.png核心代码
[Status objectWithKeyValues:dict]
模型中有个数组属性，数组里面又要装着其他模型
@interface Ad : NSObject
@property (copy, nonatomic) NSString *image;
@property (copy, nonatomic) NSString *url;
@end
@interface StatusResult : NSObject
/** 存放着一堆的微博数据（里面都是Status模型） */
@property (strong, nonatomic) NSMutableArray *statuses;
/** 存放着一堆的广告数据（里面都是Ad模型） */
@property (strong, nonatomic) NSArray *ads;
@property (strong, nonatomic) NSNumber *totalNumber;
@end
@implementation StatusResult
// 实现这个方法的目的：告诉MJExtension框架statuses和ads数组里面装的是什么模型
/*
+ (NSDictionary *)objectClassInArray
{
return @{
@"statuses" : [Status class],
@"ads" : [Ad class]
};
}
+ (Class)objectClassInArray:(NSString *)propertyName
{
if ([propertyName isEqualToString:@"statuses"]) {
return [Status class];
} else if ([propertyName isEqualToString:@"ads"]) {
return [Ad class];
}
return nil;
}
*/
// 这个方法对比上面的2个方法更加没有侵入性和污染，因为不需要导入Status和Ad的头文件
+ (NSDictionary *)objectClassInArray
{
return @{
@"statuses" : @"Status",
@"ads" : @"Ad"
};
}
@end
NSDictionary *dict = @{
@"statuses" : @[
@{
@"text" : @"今天天气真不错！",
@"user" : @{
@"name" : @"Rose",
@"icon" : @"nami.png"
}
},
@{
@"text" : @"明天去旅游了",
@"user" : @{
@"name" : @"Jack",
@"icon" : @"lufy.png"
}
}
],
@"ads" : @[
@{
@"image" : @"ad01.png",
@"url" : @"http://www.ad01.com"
},
@{
@"image" : @"ad02.png",
@"url" : @"http://www.ad02.com"
}
],
@"totalNumber" : @"2014"
};
// 将字典转为StatusResult模型
StatusResult *result = [StatusResult objectWithKeyValues:dict];
NSLog(@"totalNumber=%@", result.totalNumber);
// totalNumber=2014
// 打印statuses数组中的模型属性
for (Status *status in result.statuses) {
NSString *text = status.text;
NSString *name = status.user.name;
NSString *icon = status.user.icon;
NSLog(@"text=%@, name=%@, icon=%@", text, name, icon);
}
// text=今天天气真不错！, name=Rose, icon=nami.png
// text=明天去旅游了, name=Jack, icon=lufy.png
// 打印ads数组中的模型属性
for (Ad *ad in result.ads) {
NSLog(@"image=%@, url=%@", ad.image, ad.url);
}
// image=ad01.png, url=http://www.ad01.com
// image=ad02.png, url=http://www.ad02.com核心代码
在模型内部实现
+ (NSDictionary *)objectClassInArray方法[StatusResult objectWithKeyValues:dict]
模型中的属性名和字典中的key不相同(或者需要多级映射)
@interface Bag : NSObject
@property (copy, nonatomic) NSString *name;
@property (assign, nonatomic) double price;
@end
@interface Student : NSObject
@property (copy, nonatomic) NSString *ID;
@property (copy, nonatomic) NSString *desc;
@property (copy, nonatomic) NSString *nowName;
@property (copy, nonatomic) NSString *oldName;
@property (copy, nonatomic) NSString *nameChangedTime;
@property (strong, nonatomic) Bag *bag;
@end
@implementation Student
// 实现这个方法的目的：告诉MJExtension框架模型中的属性名对应着字典的哪个key
+ (NSDictionary *)replacedKeyFromPropertyName
{
return @{
@"ID" : @"id",
@"desc" : @"desciption",
@"oldName" : @"name.oldName",
@"nowName" : @"name.newName",
@"nameChangedTime" : @"name.info.nameChangedTime",
@"bag" : @"other.bag"
};
}
@end
NSDictionary *dict = @{
@"id" : @"20",
@"desciption" : @"孩子",
@"name" : @{
@"newName" : @"lufy",
@"oldName" : @"kitty",
@"info" : @{
@"nameChangedTime" : @"2013-08"
}
},
@"other" : @{
@"bag" : @{
@"name" : @"小书包",
@"price" : @100.7
}
}
};
// 将字典转为Student模型
Student *stu = [Student objectWithKeyValues:dict];
// 打印Student模型的属性
NSLog(@"ID=%@, desc=%@, oldName=%@, nowName=%@, nameChangedTime=%@",
stu.ID, stu.desc, stu.oldName, stu.nowName, stu.nameChangedTime);
// ID=20, desc=孩子, oldName=kitty, nowName=lufy, nameChangedTime=2013-08
NSLog(@"bagName=%@, bagPrice=%f", stu.bag.name, stu.bag.price);
// bagName=小书包, bagPrice=100.700000核心代码
在模型内部实现
+ (NSDictionary *)replacedKeyFromPropertyName方法[Student objectWithKeyValues:dict]
将一个字典数组转成模型数组
NSArray *dictArray = @[
@{
@"name" : @"Jack",
@"icon" : @"lufy.png",
},
@{
@"name" : @"Rose",
@"icon" : @"nami.png",
}
];
// 将字典数组转为User模型数组
NSArray *userArray = [User objectArrayWithKeyValuesArray:dictArray];
// 打印userArray数组中的User模型属性
for (User *user in userArray) {
NSLog(@"name=%@, icon=%@", user.name, user.icon);
}
// name=Jack, icon=lufy.png
// name=Rose, icon=nami.png核心代码
[User objectArrayWithKeyValuesArray:dictArray]
将一个模型转成字典
// 新建模型
User *user = [[User alloc] init];
user.name = @"Jack";
user.icon = @"lufy.png";
Status *status = [[Status alloc] init];
status.user = user;
status.text = @"今天的心情不错！";
// 将模型转为字典
NSDictionary *statusDict = status.keyValues;
NSLog(@"%@", statusDict);
/*
{
text = "今天的心情不错！";
user = {
icon = "lufy.png";
name = Jack;
};
}
*/
// 多级映射的模型
Student *stu = [[Student alloc] init];
stu.ID = @"123";
stu.oldName = @"rose";
stu.nowName = @"jack";
stu.desc = @"handsome";
stu.nameChangedTime = @"2018-09-08";
Bag *bag = [[Bag alloc] init];
bag.name = @"小书包";
bag.price = 205;
stu.bag = bag;
NSDictionary *stuDict = stu.keyValues;
NSLog(@"%@", stuDict);
/*
{
desciption = handsome;
id = 123;
name = {
info = {
nameChangedTime = "2018-09-08";
};
newName = jack;
oldName = rose;
};
other = {
bag = {
name = "小书包";
price = 205;
};
};
}
*/核心代码
status.keyValues、stu.keyValues
将一个模型数组转成字典数组
// 新建模型数组
User *user1 = [[User alloc] init];
user1.name = @"Jack";
user1.icon = @"lufy.png";
User *user2 = [[User alloc] init];
user2.name = @"Rose";
user2.icon = @"nami.png";
NSArray *userArray = @[user1, user2];
// 将模型数组转为字典数组
NSArray *dictArray = [User keyValuesArrayWithObjectArray:userArray];
NSLog(@"%@", dictArray);
/*
(
{
icon = "lufy.png";
name = Jack;
},
{
icon = "nami.png";
name = Rose;
}
)
*/核心代码
[User keyValuesArrayWithObjectArray:userArray]
更多用法
参考
NSObject+MJKeyValue.h参考
NSObject+MJCoding.h
来源：oschina
链接：https://my.oschina.net/u/1032974/blog/396925