使用 JSONModel 序列化自定义对象答案

【问题标题】：Serialize a custom object with JSONModel使用 JSONModel 序列化自定义对象
【发布时间】：2016-01-27 15:38:21
【问题描述】：

我尝试使用适用于 iOS 的 JSONModel 框架从我的自定义对象中创建一个 JSON 文件。我得到错误：

-[JSONModel.m:1077] EXCEPTION: Invalid type in JSON write (RegisterBuyerDataOption)
-[JSONModel.m:1077] EXCEPTION: Invalid type in JSON write (RegisterBuyerDataOption)
-[JSONModel.m:1077] EXCEPTION: Invalid type in JSON write (RegisterBuyerData)

registerBuyerData.h

@interface RegisterBuyerData : JSONModel


@property (nonatomic, strong) NSString              *buyerDataID;
@property (nonatomic        ) RegisterBuyerDataType  type;
@property (nonatomic, strong) NSString<Optional>              *title;
@property (nonatomic        ) BOOL                   required;
@property (nonatomic, strong) NSString              *value;
@property (nonatomic)         NSNumber<Optional>              *price;
@property (nonatomic)         NSNumber<Optional>              *availability;

@property (nonatomic, strong) NSArray<RegisterBuyerData*>              *fields;  //array of more RegisterBuyerData
@property (nonatomic, strong) NSArray<RegisterBuyerDataOption*>        *options; //key,value array for dropDown

@property (nonatomic, strong) NSArray                                  *parentValue;
@property (nonatomic, strong) NSArray<RegisterBuyerData*>              *children; //array of more RegisterBuyerData but only for special selected value of an options field

- (BOOL) isAvailableForUser;

@end

registerBuyerData.m

@implementation RegisterBuyerData

- (BOOL) isAvailableForUser{

    return (!_availability || [_availability integerValue] > 0 );
}


+(JSONKeyMapper*)keyMapper
{
    return [[JSONKeyMapper alloc] initWithDictionary:@{@"id": @"buyerDataID",@"value": @"value"}];
}

@end

RegisterBuyerDataOption.h

@interface RegisterBuyerDataOption : JSONModel

@property (nonatomic, strong) NSString *key;
@property (nonatomic, strong) NSString *value;
@property (nonatomic, strong) NSNumber *price;
@property (nonatomic, strong) NSNumber *availability;

- (BOOL) isAvailableForUser;

@end

不能递归地创建 JSON 字符串吗？当我调用 toJSONString 方法时，我得到了这些错误。

【问题讨论】：

标签： ios objective-c json serialization jsonmodel

【解决方案1】：

@property (nonatomic, strong) NSArray<RegisterBuyerData*> *fields;

应该是

@property (nonatomic, strong) NSArray<RegisterBuyerData> *fields;

所以去掉多余的*，然后再试一次。

编辑：

哦，我明白了。似乎您尚未将要级联的类型声明为协议。所以请执行以下操作

RegisterBuyerDataOption.h

@protocol RegisterBuyerDataOption @end;

@interface RegisterBuyerDataOption : JSONModel

@property (nonatomic, strong) NSString *key;
@property (nonatomic, strong) NSString *value;
@property (nonatomic, strong) NSNumber *price;
@property (nonatomic, strong) NSNumber *availability;

- (BOOL) isAvailableForUser;

@end

registerBuyerData.h

@protocol RegisterBuyerData @end;

@interface RegisterBuyerData : JSONModel


@property (nonatomic, strong) NSString              *buyerDataID;
@property (nonatomic        ) RegisterBuyerDataType  type;
@property (nonatomic, strong) NSString<Optional>              *title;
@property (nonatomic        ) BOOL                   required;
@property (nonatomic, strong) NSString              *value;
@property (nonatomic)         NSNumber<Optional>              *price;
@property (nonatomic)         NSNumber<Optional>              *availability;

@property (nonatomic, strong) NSArray<RegisterBuyerData*>              *fields;  //array of more RegisterBuyerData
@property (nonatomic, strong) NSArray<RegisterBuyerDataOption*>        *options; //key,value array for dropDown

@property (nonatomic, strong) NSArray                                  *parentValue;
@property (nonatomic, strong) NSArray<RegisterBuyerData*>              *children; //array of more RegisterBuyerData but only for special selected value of an options field

- (BOOL) isAvailableForUser;

@end

【讨论】：

我试过了，但 Xcode 不想构建然后：类型参数 'RegisterBuyerData' 必须是一个指针（需要一个 '*'）
谢谢，这就是问题所在。我添加了@protocol RegisterBuyerData @end;并将数组类型更改为 NSArray 没有指针。