ios - RestKit RKObjectMapping 到 CLLocation

Question

我正在使用 RestKit 的对象映射将 JSON 数据映射到对象。
是否可以将纬度和经度 JSON 属性映射到 CLLocation我的 Objective-C 类中的变量？

JSON:

{ "items": [
    {
        "id": 1,
        "latitude": "48.197186",
        "longitude": "16.267452"
    },
    {
        "id": 2,
        "latitude": "48.199615",
        "longitude": "16.309645"
    }
]

}

它应该映射到的类:

@interface ItemClass : NSObject    
  @property (nonatomic, strong) CLLocation *location;
@end

最后我想调用 itemClassObj.location.longitude从 JSON 响应中获取纬度值。

我认为这样的事情会起作用，但事实并非如此。

RKObjectMapping *mapping = [RKObjectMapping mappingForClass:[ItemClass class]];
[mapping mapKeyPath:@"latitude" toAttribute:@"location.latitude"];
[mapping mapKeyPath:@"longitude" toAttribute:@"location.longitude"];

非常感谢你的帮助。

Answer 1

RestKit 为 CLLocation 添加了一个 ValueTransformer:

https://github.com/RestKit/RKCLLocationValueTransformer

给定示例 JSON:

{
    "user": {
        "name": "Blake Watters",
        "location": {
            "latitude": "40.708",
            "longitude": "74.012"
        }
    }
}

从给定的 JSON 映射到用户对象:

@interface User : NSObject
@property (nonatomic, copy) NSString *name;
@property (nonatomic, copy) CLLocation *location;
@end

使用 RKCLLocationValueTransformer:

#import "RKCLLocationValueTransformer.h"

RKObjectMapping *userMapping = [RKObjectMapping mappingForClass:[User class]];
[userMapping addAttributeMappingsFromArray:@[ @"name" ]];
RKAttributeMapping *attributeMapping = [RKAttributeMapping attributeMappingFromKeyPath:@"location" toKeyPath:@"location"];
attributeMapping.valueTransformer = [RKCLLocationValueTransformer locationValueTransformerWithLatitudeKey:@"latitude" longitudeKey:@"longitude"];
[userMapping addPropertyMapping:attributeMapping];

RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:userMapping method:RKRequestMethodAny pathPattern:nil keyPath:@"user" statusCodes:[NSIndexSet indexSetWithIndex:200]];