JSONModel解析Dictionary To Model /JSON To Model

你在把字典转成object的时候还在按下面这样:

self.id = [jsonDict objectForKey:@"id"];

self.name = [jsonDict objectForKey:@"name"];

self.profileImageBig = [jsonDict objectForKey:@"profile_image_big"];

self.profileImageSmall = [jsonDict objectForKey:@"profile_image_small"];

self.profileImageSquare = [jsonDict objectForKey:@"profile_image_square"];

self.firstName = [jsonDict objectForKey:@"firstName"];

self.familyName = [jsonDict objectForKey:@"familyName"];

self.age = [jsonDict objectForKey:@"age"];

这样做你就out了，太繁琐，得判断值的nil，null，类型等。使用JSONModel这样即可搞定

@interface MyModel: JSONModel

@property (strong, nonatomic) NSString* id;

@property (strong, nonatomic) NSString* name;

(etc...)

@end

添加JSONModel

pod管理的直接pod 'JSONModel'

其它的直接去下载包:https://github.com/icanzilb/JSONModel

教程参考:

http://www.touch-code-magazine.com/JSONModel/

http://www.raywenderlich.com/12139/introduction-to-cocoapods

简单介绍几个方面

1. 指定一个索引,例如:

   @property (strong, nonatomic) NSString<index>* name
   
   

   你看到有一个Index,作用就是可以直接在数组中查找符合条件的对象,例如查找数组中object的name是sharofat的对象可以像下面这样写:

   //查找index为sharofat的
   
   NSArray *loans = feed.loans;
   
   NSLog(@"modelWithIndexValue --->%@",[loans modelWithIndexValue:@"Sharofat"]);
   
   

2. object的数组和dict的数组相互转换,objce转json，dict

   //将model的array转成dict的array
   
   NSMutableArray *dictArray = [LoanModel arrayOfDictionariesFromModels:feed.loans];
   
   NSLog(@"arrayOfDictionariesFromModels===>%@",dictArray);
   
   
   
   //将dict的array转成model的array
   
   NSMutableArray *modelArray = [LoanModel arrayOfModelsFromDictionaries:dictArray];
   
   NSLog(@"arrayOfModelsFromDictionaries===>%@",modelArray);
   
   
   
   LoanModel* loan = feed.loans[indexPath.row];
   
   NSLog(@"loan.toDictionary--->%@",loan.toDictionary);
   
   NSLog(@"loan.toJSONString--->%@",loan.toJSONString);
   
   

3. json，dict转object时判断value

   -(BOOL)validate:(NSError**)err
   
   {
   
       if ([self.name isEqual:@"Winfred"]) {
   
           self.name = @"Winfred rewrite name";
   
   //        return NO;
   
       }
   
       NSLog(@"Loan of %@", self.name);
   
       NSLog(@"sector of %@", self.modelSector);
   
       NSLog(@"plandate of %@", self.plandate);
   
       return YES;
   
   }
   
   

4. 很重要的keyMapper，指定映射值,如果不指定就是默认的

   • 转换带下划线的,例如:user_name 转换对应的key就是userName

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

   • 自定义key,例如: planned_expiration_date转换想对应plandate

     +(JSONKeyMapper*)keyMapper
     
     {
     
         return [[JSONKeyMapper alloc] initWithJSONToModelBlock:^NSString *(NSString *keyName) {
     
     
     
             if ([keyName isEqual:@"planned_expiration_date"]) {
     
                 return @"plandate";
     
             }else if ([keyName isEqual:@"sector"]) {
     
                 return @"modelSector";
     
             }
     
             else {
     
                 return keyName;
     
             }
     
     
     
         } modelToJSONBlock:^NSString *(NSString *keyName) {
     
     
     
             if ([keyName isEqual:@"plandate"]) {
     
                 return @"planned_expiration_date";
     
             }else if ([keyName isEqual:@"modelSector"]) {
     
                 return @"sector";
     
             }else {
     
                 return keyName;
     
             }
     
     
     
         }];
     
     }       
     
     

     也可以像下面这样写:

     +(JSONKeyMapper*)keyMapper {
     
     return [[JSONKeyMapper alloc]initWithDictionary:@{@"sector":@"modelSector"}];
     
     }
     
     

5. 指定定义的key的类型

   • optional表示字段可选,例如

     //链接字段是可选的，转换的时候允许link为空
     
     @property (nonatomic,strong) NSString<optional> *link;
     
     

   • index表示索引，参照1

   • convertondemand转换对象数组,例如:

     //表示数组是LoanModel对象
     
      @property (strong, nonatomic) NSArray<loanmodel , ConvertOnDemand>* loans;