JSONModel解析Dictionary To Model /JSON To Model

你在把字典轉成object的時候還在按下面這樣:

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"];

這樣作你就out了，太繁瑣，得判斷值的nil，null，類型等。使用JSONModel這樣便可搞定

@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'

其它的直接去下載包:https://github.com/icanzilb/JSONModel

教程參考:

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

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

簡單介紹幾個方面

1. 指定一個索引,例如:

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

   你看到有一個Index,做用就是能夠直接在數組中查找符合條件的對象,例如查找數組中object的name是sharofat的對象能夠像下面這樣寫:

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

2. object的數組和dict的數組相互轉換,objce轉json，dict

   //將model的array轉成dict的array
   NSMutableArray *dictArray = [LoanModel arrayOfDictionariesFromModels:feed.loans];
   NSLog(@"arrayOfDictionariesFromModels===>%@",dictArray);
   
   //將dict的array轉成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轉object時判斷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,若是不指定就是默認的

   • 轉換帶下劃線的,例如:user_name 轉換對應的key就是userName

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

   • 自定義key,例如: planned_expiration_date轉換想對應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;
             }
     
         }];
     }

     也能夠像下面這樣寫:

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

5. 指定定義的key的類型

   • optional表示字段可選,例如

     //連接字段是可選的，轉換的時候容許link爲空
     @property (nonatomic,strong) NSString<optional> *link;

   • index表示索引，參照1

   • convertondemand轉換對象數組,例如:

     //表示數組是LoanModel對象
      @property (strong, nonatomic) NSArray<loanmodel , ConvertOnDemand>* loans;