JSONModel解析Dictionary To Model ,JSON到Model

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查看原文：http://www.heyuan110.com/?p=1155

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，繁琐而且麻烦，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的方式

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

简单介绍一下几个方面

例如 @property (strong, nonatomic)NSString<index>*name;你看到有一个Index,这个表示指定一个索引，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"]);
```

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

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;}

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"}];}

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未空@property (nonatomic,strong) NSString</optional><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;

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