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  • MJExtension使用指导(转)

    MJExtension使用指导(转)

     MJExtension能做什么?
    1. MJExtension是一套字典和模型之间互相转换的超轻量级框架
    2. 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
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  • 原文地址:https://www.cnblogs.com/Milo-CTO/p/5593525.html
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