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MJExtension

  • The fastest and most convenient conversion between JSON and model
  • 世界上转换速度最快、使用最简单方便的字典转模型框架

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:
    • 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]
  • 提醒一句:如果NSArray\NSMutableArray属性中存放的不希望是模型,而是NSNumber、NSString等基本数据,那么就不需要实现+ (NSDictionary *)objectClassInArray方法

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.keyValuesstu.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

期待

  • 如果在使用过程中遇到BUG,希望你能Issues我,谢谢(或者尝试下载最新的框架代码看看BUG修复没有)
  • 如果在使用过程中发现功能不够用,希望你能Issues我,我非常想为这个框架增加更多好用的功能,谢谢
  • 如果你想为MJExtension输出代码,请拼命Pull Requests我
  • 一起携手打造天朝乃至世界最好用的字典模型框架,做天朝程序员的骄傲

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