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MJExtension

A fast, convenient and nonintrusive conversion framework between JSON and model.
转换速度快、使用简单方便的字典转模型框架

GitHub：CoderMJLee ｜ Blog：mjios(Chinese) ｜ PR is welcome，or feedback

关于 Swift ‼️

‼️ 在 Swift4 之后, 请在属性前加 `@objc` 修饰. 以保证 Swift 的属性能够暴露给 Objc 使用. ‼️

‼️ 请勿使用 `Bool` 类型, 因为在 Swift 中并没有桥接该类型, 不能显示的对应 `BOOL`, 请使用 `NSNumber` 替代 ‼️

Getting Started 【开始使用】
- Features 【能做什么】
- Installation 【安装】
Examples 【示例】

Getting Started【开始使用】

Features【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
JSON --> Model、Core Data Model
JSONString --> Model、Core Data Model
Model、Core Data Model --> JSON
JSON Array --> Model Array、Core Data Model Array
JSONString --> Model Array、Core Data Model Array
Model Array、Core Data Model Array --> JSON Array
Coding all properties of a model with only one line of code.
- 只需要一行代码，就能实现模型的所有属性进行Coding（归档和解档）

Installation【安装】

From CocoaPods【使用CocoaPods】

pod 'MJExtension'

Manually【手动导入】

Drag all source files under folder MJExtension to your project.【将MJExtension文件夹中的所有源代码拽入项目中】
Import the main header file：#import "MJExtension.h"【导入主头文件：#import "MJExtension.h"】

MJExtension.h
MJConst.h               MJConst.m
MJFoundation.h          MJFoundation.m
MJProperty.h            MJProperty.m
MJType.h                MJType.m
NSObject+MJCoding.h     NSObject+MJCoding.m
NSObject+MJProperty.h   NSObject+MJProperty.m
NSObject+MJKeyValue.h   NSObject+MJKeyValue.m

Examples【示例】

The most simple JSON -> Model【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) unsigned int age;
@property (copy, nonatomic) NSString *height;
@property (strong, nonatomic) NSNumber *money;
@property (assign, nonatomic) Sex sex;
@property (assign, nonatomic, getter=isGay) BOOL gay;
@end

/***********************************************/

NSDictionary *dict = @{
    @"name" : @"Jack",
    @"icon" : @"lufy.png",
    @"age" : @20,
    @"height" : @"1.55",
    @"money" : @100.9,
    @"sex" : @(SexFemale),
    @"gay" : @"true"
//   @"gay" : @"1"
//   @"gay" : @"NO"
};

// JSON -> User
User *user = [User mj_objectWithKeyValues:dict];

NSLog(@"name=%@, icon=%@, age=%zd, height=%@, money=%@, sex=%d, gay=%d", user.name, user.icon, user.age, user.height, user.money, user.sex, user.gay);
// name=Jack, icon=lufy.png, age=20, height=1.550000, money=100.9, sex=1

JSONString -> Model【JSON字符串转模型】

// 1.Define a JSONString
NSString *jsonString = @"{\"name\":\"Jack\", \"icon\":\"lufy.png\", \"age\":20}";

// 2.JSONString -> User
User *user = [User mj_objectWithKeyValues:jsonString];

// 3.Print user's properties
NSLog(@"name=%@, icon=%@, age=%d", user.name, user.icon, user.age);
// name=Jack, icon=lufy.png, age=20

Model contains model【模型中嵌套模型】

@interface Status : NSObject
@property (copy, nonatomic) NSString *text;
@property (strong, nonatomic) User *user;
@property (strong, nonatomic) Status *retweetedStatus;
@end

/***********************************************/

NSDictionary *dict = @{
    @"text" : @"Agree!Nice weather!",
    @"user" : @{
        @"name" : @"Jack",
        @"icon" : @"lufy.png"
    },
    @"retweetedStatus" : @{
        @"text" : @"Nice weather!",
        @"user" : @{
            @"name" : @"Rose",
            @"icon" : @"nami.png"
        }
    }
};

// JSON -> Status
Status *status = [Status mj_objectWithKeyValues:dict];

NSString *text = status.text;
NSString *name = status.user.name;
NSString *icon = status.user.icon;
NSLog(@"text=%@, name=%@, icon=%@", text, name, icon);
// text=Agree!Nice weather!, 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=Nice weather!, name2=Rose, icon2=nami.png

Model contains model-array【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
/** Contatins status model */
@property (strong, nonatomic) NSMutableArray *statuses;
/** Contatins ad model */
@property (strong, nonatomic) NSArray *ads;
@property (strong, nonatomic) NSNumber *totalNumber;
@end

/***********************************************/

// Tell MJExtension what type of model will be contained in statuses and ads.
[StatusResult mj_setupObjectClassInArray:^NSDictionary *{
    return @{
               @"statuses" : @"Status",
               // @"statuses" : [Status class],
               @"ads" : @"Ad"
               // @"ads" : [Ad class]
           };
}];
// Equals: StatusResult.m implements +mj_objectClassInArray method.

NSDictionary *dict = @{
    @"statuses" : @[
                      @{
                          @"text" : @"Nice weather!",
                          @"user" : @{
                              @"name" : @"Rose",
                              @"icon" : @"nami.png"
                          }
                      },
                      @{
                          @"text" : @"Go camping tomorrow!",
                          @"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"
};

// JSON -> StatusResult
StatusResult *result = [StatusResult mj_objectWithKeyValues:dict];

NSLog(@"totalNumber=%@", result.totalNumber);
// totalNumber=2014

// Printing
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=Nice weather!, name=Rose, icon=nami.png
// text=Go camping tomorrow!, name=Jack, icon=lufy.png

// Printing
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

Model name - JSON key mapping【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

/***********************************************/

// How to map
[Student mj_setupReplacedKeyFromPropertyName:^NSDictionary *{
    return @{
               @"ID" : @"id",
               @"desc" : @"description",
               @"oldName" : @"name.oldName",
               @"nowName" : @"name.newName",
               @"nameChangedTime" : @"name.info[1].nameChangedTime",
               @"bag" : @"other.bag"
           };
}];
// Equals: Student.m implements +mj_replacedKeyFromPropertyName method.

NSDictionary *dict = @{
    @"id" : @"20",
    @"description" : @"kids",
    @"name" : @{
        @"newName" : @"lufy",
        @"oldName" : @"kitty",
        @"info" : @[
        		 @"test-data",
        		 @{
            	             @"nameChangedTime" : @"2013-08"
                         }
                  ]
    },
    @"other" : @{
        @"bag" : @{
            @"name" : @"a red bag",
            @"price" : @100.7
        }
    }
};

// JSON -> Student
Student *stu = [Student mj_objectWithKeyValues:dict];

// Printing
NSLog(@"ID=%@, desc=%@, oldName=%@, nowName=%@, nameChangedTime=%@",
      stu.ID, stu.desc, stu.oldName, stu.nowName, stu.nameChangedTime);
// ID=20, desc=kids, oldName=kitty, nowName=lufy, nameChangedTime=2013-08
NSLog(@"bagName=%@, bagPrice=%f", stu.bag.name, stu.bag.price);
// bagName=a red bag, bagPrice=100.700000

JSON array -> model array【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"
                         }
                     ];

// JSON array -> User array
NSArray *userArray = [User mj_objectArrayWithKeyValuesArray:dictArray];

// Printing
for (User *user in userArray) {
    NSLog(@"name=%@, icon=%@", user.name, user.icon);
}
// name=Jack, icon=lufy.png
// name=Rose, icon=nami.png

Model -> JSON【将一个模型转成字典】

// New model
User *user = [[User alloc] init];
user.name = @"Jack";
user.icon = @"lufy.png";

Status *status = [[Status alloc] init];
status.user = user;
status.text = @"Nice mood!";

// Status -> JSON
NSDictionary *statusDict = status.mj_keyValues;
NSLog(@"%@", statusDict);
/*
 {
 text = "Nice mood!";
 user =     {
 icon = "lufy.png";
 name = Jack;
 };
 }
 */

// More complex situation
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 = @"a red bag";
bag.price = 205;
stu.bag = bag;

NSDictionary *stuDict = stu.mj_keyValues;
NSLog(@"%@", stuDict);
/*
{
    ID = 123;
    bag =     {
        name = "\U5c0f\U4e66\U5305";
        price = 205;
    };
    desc = handsome;
    nameChangedTime = "2018-09-08";
    nowName = jack;
    oldName = rose;
}
 */

Model array -> JSON array【将一个模型数组转成字典数组】

// New model array
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];

// Model array -> JSON array
NSArray *dictArray = [User mj_keyValuesArrayWithObjectArray:userArray];
NSLog(@"%@", dictArray);
/*
 (
 {
 icon = "lufy.png";
 name = Jack;
 },
 {
 icon = "nami.png";
 name = Rose;
 }
 )
 */

Core Data

NSDictionary *dict = @{
                         @"name" : @"Jack",
                         @"icon" : @"lufy.png",
                         @"age" : @20,
                         @"height" : @1.55,
                         @"money" : @"100.9",
                         @"sex" : @(SexFemale),
                         @"gay" : @"true"
                     };

// This demo just provide simple steps
NSManagedObjectContext *context = nil;
User *user = [User mj_objectWithKeyValues:dict context:context];

[context save:nil];

Coding

#import "MJExtension.h"

@implementation Bag
// NSCoding Implementation
MJExtensionCodingImplementation
@end

/***********************************************/

// what properties not to be coded
[Bag mj_setupIgnoredCodingPropertyNames:^NSArray *{
    return @[@"name"];
}];
// Equals: Bag.m implements +mj_ignoredCodingPropertyNames method.

// Create model
Bag *bag = [[Bag alloc] init];
bag.name = @"Red bag";
bag.price = 200.8;

NSString *file = [NSHomeDirectory() stringByAppendingPathComponent:@"Desktop/bag.data"];
// Encoding
[NSKeyedArchiver archiveRootObject:bag toFile:file];

// Decoding
Bag *decodedBag = [NSKeyedUnarchiver unarchiveObjectWithFile:file];
NSLog(@"name=%@, price=%f", decodedBag.name, decodedBag.price);
// name=(null), price=200.800000

Camel -> underline【统一转换属性名（比如驼峰转下划线）】

// Dog
#import "MJExtension.h"

@implementation Dog
+ (NSString *)mj_replacedKeyFromPropertyName121:(NSString *)propertyName
{
    // nickName -> nick_name
    return [propertyName mj_underlineFromCamel];
}
@end

// NSDictionary
NSDictionary *dict = @{
                       @"nick_name" : @"旺财",
                       @"sale_price" : @"10.5",
                       @"run_speed" : @"100.9"
                       };
// NSDictionary -> Dog
Dog *dog = [Dog mj_objectWithKeyValues:dict];

// printing
NSLog(@"nickName=%@, scalePrice=%f runSpeed=%f", dog.nickName, dog.salePrice, dog.runSpeed);

NSString -> NSDate, nil -> @""【过滤字典的值（比如字符串日期处理为NSDate、字符串nil处理为@""）】

// Book
#import "MJExtension.h"

@implementation Book
- (id)mj_newValueFromOldValue:(id)oldValue property:(MJProperty *)property
{
    if ([property.name isEqualToString:@"publisher"]) {
        if (oldValue == nil) return @"";
    } else if (property.type.typeClass == [NSDate class]) {
        NSDateFormatter *fmt = [[NSDateFormatter alloc] init];
        fmt.dateFormat = @"yyyy-MM-dd";
        return [fmt dateFromString:oldValue];
    }

    return oldValue;
}
@end

// NSDictionary
NSDictionary *dict = @{
                       @"name" : @"5分钟突破iOS开发",
                       @"publishedTime" : @"2011-09-10"
                       };
// NSDictionary -> Book
Book *book = [Book mj_objectWithKeyValues:dict];

// printing
NSLog(@"name=%@, publisher=%@, publishedTime=%@", book.name, book.publisher, book.publishedTime);

More use cases【更多用法】

Please reference to NSObject+MJKeyValue.h and 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

README.md

MJExtension

关于 Swift ‼️

‼️ 在 Swift4 之后, 请在属性前加 @objc 修饰. 以保证 Swift 的属性能够暴露给 Objc 使用. ‼️

‼️ 请勿使用 Bool 类型, 因为在 Swift 中并没有桥接该类型, 不能显示的对应 BOOL, 请使用 NSNumber 替代 ‼️

Contents

Getting Started【开始使用】

Features【能做什么】

Installation【安装】

From CocoaPods【使用CocoaPods】

Manually【手动导入】

Examples【示例】

The most simple JSON -> Model【最简单的字典转模型】

JSONString -> Model【JSON字符串转模型】

Model contains model【模型中嵌套模型】

Model contains model-array【模型中有个数组属性，数组里面又要装着其他模型】

Model name - JSON key mapping【模型中的属性名和字典中的key不相同(或者需要多级映射)】

JSON array -> model array【将一个字典数组转成模型数组】

Model -> JSON【将一个模型转成字典】

Model array -> JSON array【将一个模型数组转成字典数组】

Core Data

Coding

Camel -> underline【统一转换属性名（比如驼峰转下划线）】

NSString -> NSDate, nil -> @""【过滤字典的值（比如字符串日期处理为NSDate、字符串nil处理为@""）】

More use cases【更多用法】

期待

‼️ 在 Swift4 之后, 请在属性前加 `@objc` 修饰. 以保证 Swift 的属性能够暴露给 Objc 使用. ‼️

‼️ 请勿使用 `Bool` 类型, 因为在 Swift 中并没有桥接该类型, 不能显示的对应 `BOOL`, 请使用 `NSNumber` 替代 ‼️