JSONModel和MJExtension的使用和区别

作者: 攻城狮丶 | 来源:发表于2017-12-28 16:59 被阅读746次

JSONModel的使用

添加JSONModel到你的项目

地址：https://github.com/jsonmodel/jsonmodel

方法一

CocoaPods
pod 'JSONModel'

方法二

下载JSONModel源文件
拷贝到项目中
导入SystemConfiguration.framework框架

使用--参考github上JSONModel的README.md翻译

{ "id": "10", "country": "Germany", "dialCode": 49, "isInEurope": true }

为你的数据模型创建一个Objective-C的类，继承自JSONModel.
将JSON中的keys在.h文件中声明为属性:

#import "JSONModel.h"

@interface CountryModel : JSONModel

@property (assign, nonatomic) int id;
@property (strong, nonatomic) NSString* country;
@property (strong, nonatomic) NSString* dialCode;
@property (assign, nonatomic) BOOL isInEurope;

@end

在.m文件中不需要任何操作

用数据初始化你的model:

#import "CountryModel.h"
...
NSString* json = (fetch here JSON from Internet) ...
NSError* err = nil;
CountryModel* country = [[CountryModel alloc] initWithString:json error:&err];

如果传过来的JSON合法，你所定义的所有的属性都会与该JSON的值相对应，甚至JSONModel会尝试去转换数据为你期望的类型，如上所示:

转换id,从字符串转换为int
只需要拷贝一下country的值
转换diaCode,从number转换为字符串
最后一个是将isInEurope转换为BOOL属性
所以，你所需要做的就是将你的属性定义为期望的类型即可。

例子

命名自动匹配

{
  "id": "123",
  "name": "Product name",
  "price": 12.95
}

@interface ProductModel : JSONModel
@property (assign, nonatomic) int id;
@property (strong, nonatomic) NSString* name;
@property (assign, nonatomic) float price;
@end

@implementation ProductModel
@end

嵌套model

{
  "order_id": 104,
  "total_price": 13.45,
  "product" : {
        "id": "123",
        "name": "Product name",
        "price": 12.95
  }
}

@interface OrderModel : JSONModel
@property (assign, nonatomic) int order_id;
@property (assign, nonatomic) float total_price;
@property (strong, nonatomic) ProductModel* product;
@end

@implementation OrderModel
@end

model数组（集合）

{
    "orderId": 104,
    "totalPrice": 103.45,
    "products": [
        {
            "id": 123,
            "name": "Product #1",
            "price": 12.95
        },
        {
            "id": 137,
            "name": "Product #2",
            "price": 82.95
        }
    ]
}

@protocol ProductModel;

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

@interface OrderModel : JSONModel
@property (nonatomic) NSInteger orderId;
@property (nonatomic) float totalPrice;
@property (nonatomic) NSArray <ProductModel> *products;
@end

注意: 尖括号后 <code>NSArray</code> 包含一个协议. 这跟Objective-C原生的泛型不是一个概念. 他们不会冲突, 但对于JSONModel来说,协议必须在一个地方声明。

当然也可以这样

@interface OrderModel : JSONModel
@property (nonatomic) NSInteger orderId;
@property (nonatomic) float totalPrice;
@property (nonatomic) NSArray<ProductModel *> <ProductModel> *products;
@end

嵌套key mapping

{
    "orderId": 104,
    "orderDetails": {
        "name": "Product #1",
        "price": {
            "usd": 12.95
        }
    }
}

@interface OrderModel : JSONModel
@property (nonatomic) NSInteger id;
@property (nonatomic) NSString *productName;
@property (nonatomic) float price;
@end

@implementation OrderModel

+ (JSONKeyMapper *)keyMapper
{
    return [[JSONKeyMapper alloc] initWithModelToJSONDictionary:@{
        @"id": @"orderId",
        @"productName": @"orderDetails.name",
        @"price": @"orderDetails.price.usd"
    }];
}
@end

设置下划线字段名自动转驼峰字段名

{
  "order_id": 104,
  "order_product" : @"Product#1",
  "order_price" : 12.95
}

@interface OrderModel : JSONModel
@property (nonatomic) NSInteger orderId;
@property (nonatomic) NSString *orderProduct;
@property (nonatomic) float orderPrice;
@end

@implementation OrderModel

+ (JSONKeyMapper *)keyMapper
{
    return [JSONKeyMapper mapperForSnakeCase];
}

@end

可选属性 (就是说这个属性可以为null或者为空)

{
    "id": 123,
    "name": null,
    "price": 12.95
}

@interface ProductModel : JSONModel
@property (nonatomic) NSInteger id;
@property (nonatomic) NSString <Optional> *name;
@property (nonatomic) float price;
@property (nonatomic) NSNumber <Optional> *uuid;
@end

忽略属性 (就是完全忽略这个属性)

{
    "id": 123,
    "name": null
}

@interface ProductModel : JSONModel
@property (nonatomic) NSInteger id;
@property (nonatomic) NSString <Ignore> *customProperty;
@end

设置所有的属性为可选(所有属性值可以为空)

{
    "id": null
}

@interface ProductModel : JSONModel
@property (nonatomic) NSInteger id;
@end

@implementation ProductModel

+ (BOOL)propertyIsOptional:(NSString *)propertyName
{
    if ([propertyName isEqualToString:@"id"])
        return YES;

    return NO;
}

@end

将model转化为字典或者json字符串

ProductModel *pm = [ProductModel new];
pm.name = @"Some Name";

// convert to dictionary
NSDictionary *dict = [pm toDictionary];

// convert to json
NSString *string = [pm toJSONString];

自定义数据转换

@interface JSONValueTransformer (CustomNSDate)
@end

@implementation JSONValueTransformer (CustomTransformer)

- (NSDate *)NSDateFromNSString:(NSString *)string
{
    NSDateFormatter *formatter = [NSDateFormatter new];
    formatter.dateFormat = APIDateFormat;
    return [formatter dateFromString:string];
}

- (NSString *)JSONObjectFromNSDate:(NSDate *)date
{
    NSDateFormatter *formatter = [NSDateFormatter new];
    formatter.dateFormat = APIDateFormat;
    return [formatter stringFromDate:date];
}

@end

自定义getters和setters

@interface ProductModel : JSONModel
@property (nonatomic) NSInteger id;
@property (nonatomic) NSString *name;
@property (nonatomic) float price;
@property (nonatomic) NSLocale *locale;
@end

@implementation ProductModel

- (void)setLocaleWithNSString:(NSString *)string
{
    self.locale = [NSLocale localeWithLocaleIdentifier:string];
}

- (void)setLocaleWithNSDictionary:(NSDictionary *)dictionary
{
    self.locale = [NSLocale localeWithLocaleIdentifier:dictionary[@"identifier"]];
}

- (NSString *)JSONObjectForLocale
{
    return self.locale.localeIdentifier;
}

@end

自定义JSON校验

@interface ProductModel : JSONModel
@property (nonatomic) NSInteger id;
@property (nonatomic) NSString *name;
@property (nonatomic) float price;
@property (nonatomic) NSLocale *locale;
@property (nonatomic) NSNumber <Ignore> *minNameLength;
@end

@implementation ProductModel

- (BOOL)validate:(NSError **)error
{
    if (![super validate:error])
        return NO;

    if (self.name.length < self.minNameLength.integerValue)
    {
        *error = [NSError errorWithDomain:@"me.mycompany.com" code:1 userInfo:nil];
        return NO;
    }

    return YES;
}

@end

MJExtension的使用

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);

两者时间的区别和总结

1.JSONModel各方面都挺好的，唯一需要注意的地方是它归档的方式, 它不是将对象归档，而是转换成字典再归档
2.JSONModel使用时需要创建的model类继承JSONModel
3.MJExtension使用时并不需要继承，其对父类的依赖性更少