iOS MJExtension简单使用

写在前面：因为懒，不爱写东西了。感谢我的兄弟兼iOS引路人韩韩，一直监督着我学习，逼着我理解技术和写出来，因此有了下文。不过大部分都是借鉴别人笔记，当然我理解后重新敲了一遍，感谢万能的简友。
目录
一：封装base模型
二：字典转模型
三：JSON字符串转模型
四：模型中嵌套模型
五：模型中有个数组属性，数组里面又要装着其它模型
六：将一个字典数组转成模型数组

0.封装base模型

.h

 @interface LccBaseModel : NSObject
//模型中的属性名和字典中的key不相同,映射替换
@property(nonatomic,copy)NSString *ID;
//通过字典来创建一个模型
+ (instancetype)objectWithDic:(NSDictionary*)dic;
//通过JSON字符串转模型
+ (instancetype)objectWithJSONStr:(NSString *)jsonStr;
//通过字典数组来创建一个模型数组
 + (NSArray*)objectsWithArray:(NSArray<NSDictionary*>*)arr;
@end

.m

#import "LccBaseModel.h"
#import "MJExtension.h"
@implementation LccBaseModel
+ (NSDictionary *)mj_replacedKeyFromPropertyName{
  // 替换key
   return @{@"ID":@"id"};
 }
+ (instancetype)objectWithDic:(NSDictionary*)dic{ >        //容错处理
   if (![dic isKindOfClass:[NSDictionary class]]||!dic) {
      return nil;
   }
    NSString *className = [NSString stringWithUTF8String:object_getClassName(self)];
   return [NSClassFromString(className) mj_objectWithKeyValues:dic];
}
+ (instancetype)objectWithJSONStr:(NSString *)jsonStr{
   //容错处理
   if (![jsonStr isKindOfClass:[NSString class]]||!jsonStr) {
      return nil;
 }
 NSString *className = [NSString stringWithUTF8String:object_getClassName(self)];
   return [NSClassFromString(className) mj_objectWithKeyValues:jsonStr];
}
+ (NSArray*)objectsWithArray:(NSArray<NSDictionary*>*)arr{  
  //获取子类名
    NSString * className =  [NSString stringWithUTF8String:object_getClassName(self)];
    return [NSClassFromString(className) mj_objectArrayWithKeyValuesArray:arr];    
}
@end

1. 字典转模型

.h

UserModel模型
#import "LccBaseModel.h"
typedef enum {
    SexMale,
    SexFemale
} Sex;
@interface UserModel : LccBaseModel
@property (nonatomic,copy)   NSString *name;
@property (nonatomic,assign) Sex sex;
@property (nonatomic,assign) NSInteger age;
@property (nonatomic,copy)   NSDictionary *dataDic;
@property (nonatomic,copy)   NSString *msg;
@property (nonatomic,copy)   NSString *icon;

@end

/* 字典转模型 */
- (void)demo1{
    NSDictionary *dic = @{@"id":@"111111",
                          @"name":@"韩韩",
                         @"age":@18,
                         @"sex": @(SexFemale)
                          };
    UserModel *model  = [UserModel objectWithDic:dic];
    NSLog(@"dic = %@ \n id = %@,name = %@,age:%zd,sex:%u",dic,model.ID,model.name,model.age,model.sex);

}

log.png

2. JSON字符串转模型

.h

 ShopModel模型
 #import "LccBaseModel.h"
 @class UserModel;
 @interface ShopModel : LccBaseModel
 @property (nonatomic,copy)   NSString *productName;
 @property (nonatomic,assign) NSInteger price;
 @property (nonatomic,strong)   UserModel *user;
 @end

/* JSON字符串转模型 */

    - (void)demo2{
        NSString *jsonStr = @"{\"id\":\"111111\",\"name\":\"韩韩\", \"age\":18}";
        UserModel *model = [UserModel objectWithJSONStr:jsonStr];
        NSLog(@"jsonStr = %@ \n id = %@,name = %@,age:%zd",jsonStr,model.ID,model.name,model.age);
     }

image.png

3. 模型中嵌套模型

    /* 模型中嵌套模型 */
    - (void)demo3{
        NSDictionary *dic = @{
                              @"msg":@"成功",
                              @"dataDic":@{
                                      @"productName":@"飞机杯",
                                      @"price":@"500",
                                      @"user":@{
                                              @"name":@"韩大帅哥",
                                              @"age":@18,
                                              }
                                      },
                              };
        UserModel *model = [UserModel objectWithDic:dic];
        ShopModel *shopModel = [ShopModel objectWithDic:model.dataDic];
        NSLog(@"msg= %@",model.msg);
        NSLog(@"name= %@  age:%ld",shopModel.user.name,(long)shopModel.user.age);
        NSLog(@"productName= %@  price= %ld",shopModel.productName,(long)shopModel.price);
    }

image.png

4.模型中有个数组属性，数组里面又要装着其它模型

.h

    #import "LccBaseModel.h"
    @interface StatusResult : LccBaseModel
    @property (strong, nonatomic) NSMutableArray *statuses;
    @property (strong, nonatomic) NSArray *ads;
    @property (strong, nonatomic) NSNumber *totalNumber;
    @end

    /* 模型中有个数组属性，数组里面又要装着其它模型 */
    - (void)demo4{
        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"
                               };
        NSLog(@"dict= %@",dict);    
        StatusResult *model = [StatusResult objectWithDic:dict];
        NSArray *dataArray = [StatusResult objectsWithArray:model.statuses];
        NSLog(@"dataArray= %@",dataArray);
        // 打印statuses数组中的模型属性
        for (NSDictionary *dic in model.statuses) {
            StatusModel *status = [StatusModel objectWithDic:dic];
                NSString *text = status.text;
                NSString *name = status.user.name;
                NSString *icon = status.user.icon;
                NSLog(@"text=%@, name=%@, icon=%@", text, name, icon);
        }
        // 打印ads数组中的模型属性
        for (NSDictionary *dic in model.ads) {
            AdsModel *ad = [AdsModel objectWithDic:dic];
            NSLog(@"image=%@, url=%@", ad.image, ad.url);
        }
    }

image.png

5.将一个字典数组转成模型数组

        /* 将一个字典数组转成模型数组 */
        - (void)demo5{
            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 = [UserModel objectsWithArray:dictArray];
            // 打印userArray数组中的User模型属性
            for (UserModel *user in userArray) {
                NSLog(@"name=%@, icon=%@", user.name, user.icon);
            }
        }

image.png