我正在尝试使用 JSONModel 创建模型类.使用 NSJSONSerialization
后我的 json 字典如下所示。
{
apiStatus = {
message = SUCCESS;
success = 1;
};
boardingPoints = "<null>";
inventoryType = 0;
seats = (
{
ac = 0;
available = 1;
bookedBy = "<null>";
commission = "<null>";
fare = 1200;
},
{
ac = 0;
available = 1;
bookedBy = "<null>";
commission = "<null>";
fare = 1200;
},
);
}
JSON 看起来像这样:
{"boardingPoints":null,"inventoryType":0,"apiStatus":{"success":true,"message":"SUCCESS"},"seats":[{"fare":1200,"commission":null,"bookedBy":null,"ac":false,"available":true},{"fare":1200,"commission":null,"bookedBy":null,"ac":false,"available":true},]}
我有一个像这样的模型类:-
@interface Seat : JSONModel
@property (nonatomic,strong)NSString *ac;
@property (nonatomic,strong)NSString *available;
@property(nonatomic,strong)NSString *bookedBy;
@property(nonatomic,strong)NSString *comission;
@property(nonatomic)NSNumber * fare;
对于映射键,我是这样做的:-
+(JSONKeyMapper*)keyMapper {
return [[JSONKeyMapper alloc] initWithDictionary:@{@"ac":@"ac",
@"available":@"available",
@"bookedBy":@"bookedBy",
@"commission":@"commission",
@"fare":@"fare", }];
}
但是,当我尝试使用此模型时,出现以下错误:
[JSONModel.m:252] Incoming data was invalid [Seat initWithDictionary:]. Keys missing: {(
bookedBy,
comission,
available,
ac,
fare,
)}
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSPlaceholderArray initWithObjects:count:]: attempt to insert nil object from objects[0]'
我是这样使用它的:
//Using JSON Model.
NSError *jsonError;
seat = [[Seat alloc]initWithDictionary:jsonDictionary error:&jsonError];
jsonArray = @[seat.ac,seat.available,seat.bookedBy,seat.comission,seat.fare];
NSLog(@"JSON Model Array : %@", jsonArray);
如何正确使用?
最佳答案
首先,如果您的属性名称与字段名称匹配,则无需覆盖 +(JSONKeyMapper*)keyMapper
。尝试为可以为 null 的字段放置可选关键字。
@interface Seat : JSONModel
@protocol Seat;
@property (nonatomic,strong)NSString *ac;
@property (nonatomic,strong)NSString<Optional> *available;
@property(nonatomic,strong)NSString<Optional> *bookedBy;
@property(nonatomic,strong)NSString *comission;
@property(nonatomic)NSNumber * fare;
@end
更进一步,您可以像这样在顶级类中进行级联:
//Result.h
#import "Seat.h"
#import "APIStatus.h"
@interface Result: JSONModel
@property(nonatomic,strong) APIStatus *apiStatus;
@property(nonatomic,strong) NSString<Optional> *boardingPoints;
@property(nonatomic,strong) NSArray<Seat> *seats;
@property(nonatomic,strong) NSNumber *boardingPoints;
@end
//APIStatus.h
@interface APIStatus: JSONModel
@property(nonatomic,strong) NSString *message;
@property(nonatomic,strong) NSNumber *success;
@end
编辑:这样您只需要使用 JSONModel 初始化结果模型,所有中间类都会自动创建。您可能需要尝试使用属性类型。如果您需要引用,JSONModel 的 github 页面提供了大量解释。
关于ios - 如何使用 JSONModel 创建模型类?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/25260961/