MJExtension使用指导(转)

MJExtension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

1. 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

2.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

方法一:cocoapods导入pod 'MJExtension'

方法二: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

1.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1:

[User objectWithKeyValues:dict]

2.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2

[Status objectWithKeyValues:dict]

3.模型中有个数组属性,数组里面又要装着其它模型

@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3:

在模型内部实现+ (NSDictionary *)objectClassInArray方法

[StatusResult objectWithKeyValues:dict]

4.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4:

在模型内部实现+ (NSDictionary *)replacedKeyFromPropertyName方法

[Student objectWithKeyValues:dict]

5.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5:

[User objectArrayWithKeyValuesArray:dictArray]

6.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6:

status.keyValues、stu.keyValues

7.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7:

[User keyValuesArrayWithObjectArray:userArray]

更多用法

参考NSObject+MJKeyValue.h

参考NSObject+MJCoding.h

作者:PPAbner

链接:http://www.jianshu.com/p/93c242452b9b

來源:

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