我是Objective-C的新手,我正在尝试使用RestKit从Web服务接收JSON响应。我已成功将数据收回我的应用程序,看起来像这样查看响应:
{id:"1","Translation":"Test"}
我想在我的应用程序中将此翻译映射到我的“翻译”对象,但尝试了几种不同的方法,但我不知道如何实现这一目标。
所以我的问题是:
@implementation Translation
@synthesize identifier = _identifier;
@synthesize translation = _translation;
- (NSDictionary*)elementToPropertyMappings {
return [NSDictionary dictionaryWithKeysAndObjects:
@"id", @"identifier",
@"translation", @"translation",
nil];
}
@end
- (NSString *)performTranslation:(NSString *)translation
{
NSString *data = [[NSString alloc] initWithFormat:@"{\"SourceId\": \"%@\",\"RegionTag\": \"%@\",\"InputString\": \"%@\"}", @"1", @"Glasgow", translation];
NSString *post = data;
RKRequest *MyRequest = [[RKRequest alloc] initWithURL:[[NSURL alloc] initWithString:@"http://my.url.com/Translation/Translate"]];
MyRequest.method = RKRequestMethodPOST;
MyRequest.HTTPBodyString = post;
MyRequest.additionalHTTPHeaders = [[NSDictionary alloc] initWithObjectsAndKeys:@"application/json", @"Content-Type", @"application/json", @"Accept", nil];
[MyRequest send];
RKResponse *Response = [MyRequest sendSynchronously];
return Response.bodyAsString; <--- looking to map this to translation object here
}
答案 0 :(得分:4)
您的代码片段似乎有点过时了。我强烈建议您阅读最新的Object Mapping guide,以便充分利用RestKit的潜力 - 尤其是没有KVC的映射。
编辑:
为了使用RestKit发布一个对象并收到一个答案,我们定义一个TranslationRequest
类来保存我们的请求&amp; Translation
我们的回复。
首先,我们设置了RKObjectManager
和映射(我通常在我的AppDelegate中执行此操作):
RKObjectManager *manager = [RKObjectManager objectManagerWithBaseURL:kOurBaseUrl];
[manager setSerializationMIMEType:RKMIMETypeJSON];
//this is a singleton, but we keep the manager variable to avoid using [RKObjectManager sharedManager] all the time
//Here we define a mapping for the request. Note: We define it as a mapping from JSON to entity and use inverseMapping selector later.
RKObjectMapping *translationRequestMapping = [RKObjectMapping mappingForClass:[TranslationRequest class]];
[translationRequestMapping mapKeyPath:@"RegionTag" toAttribute:@"regionTag"];
...
[[manager mappingProvider] setSerializationMapping:[translationRequestMapping inverseMapping] forClass:[TranslationRequest class]];
//now we define the mapping for our response object
RKObjectMapping *translationMapping = [RKObjectMapping mappingForClass:[Translation class]];
[translationMapping mapKeyPath:@"id" toAttribute:@"identifier"];
[translationMapping mapKeyPath:@"Translation" toAttribute:@"translation"];
[[manager mappingProvider] addObjectMapping:mapping];
//finally, we route our TranslationRequest class to a given endpoint
[[manager router] routeClass:[TranslationRequest class] toResourcePath:kMyPostEndpoint];
这应该足够必要的设置。我们可以在代码中的任何地方调用我们的后端(例如在任何控制器中),如下所示:
//we create new TranslationRequest
TranslationRequest *request = [[TranslationRequest alloc] init];
[request setRegionTag:@"Hello"];
....
//then we fetch the desired mapping to map our response with
RKObjectMapping *responseMapping = [[RKObjectManager sharedManager].mappingProvider objectMappingForClass:class]
//and just call it. Be sure to let 'self' implement the required RKObjectManagerDelegate protocol
[[RKObjectManager sharedManager] postObject:request mapResponseWith:responseMapping delegate:self];]
尝试这种方法并告诉我你是否需要任何帮助..我无法完全测试它,因为我没有任何合适的后端会返回响应,但从RestKit日志判断这应该有效。
答案 1 :(得分:3)
您需要将返回的JSON字符串传递给JSON解析器。我使用SBJSON。然后,您可以使用生成的字典填充对象的属性。
RestKit似乎有本机对象封装了四个不同的JSON解析器。但是,我建议谨慎,因为他们似乎认为顶级解析对象将始终是字典。
另外,您的问题中的示例不是有效的JSON。它应该是这样的:
{"id":"1","Translation":"Test"}