在 Objective-C 中使用 RestKit 实现对象映射 [英] Implementing object mapping using RestKit in Objective-C

问题描述

我无法使用 RestKit 和 Objective-C 将 JSON 响应映射到对象.

I am having trouble mapping a JSON response to objects using RestKit and Objective-C.

我已经按照 我之前的帖子 mja.

我按照下面的示例在我的控制器中调用我的后端.

I call my backend in my controller as per the example below.

我遇到了两个问题:

1. [[RKObjectManager sharedManager] postObject:request mapResponseWith:responseMapping delegate:self];} <-- 这会导致self"与类型 id 不兼容.我需要向这里发送什么信息?
2. 如何将 didLoadObject 中的结果转换为我定义的 Translation 对象 (translationText)

任何帮助将不胜感激.

@synthesize inputtext = _text; 
@synthesize translation = _translation; 
@synthesize translatedText = _translatedText;

- (Translation *)translatedText {
if (!_translatedText) _translatedText = [[Translation alloc] init];
return _translatedText; }

- (IBAction)translatePressed {
//create TranslationRequest
TranslationRequest *request = [[TranslationRequest alloc] init];
[request setSourceId:@"1"];
[request setRegionTag:@"Hello"];
[request setInputString:self.inputtext.text];

//fetch the desired mapping to map response with
RKObjectMapping * responseMapping = [[RKObjectManager sharedManager].mappingProvider objectMappingForClass:[Translation class]];

[[RKObjectManager sharedManager] postObject:request mapResponseWith:responseMapping delegate:self]; }

- (void)objectLoader:(RKObjectLoader*)objectLoader didLoadObject:(id)object  { 
    self.translation.text = [object translatedText].translation; 
} 
- (void)objectLoader:(RKObjectLoader*)objectLoader didFailWithError:(NSError*)error { 
    NSLog(@"Hit error: %@", error);  
}

推荐答案

为了纠正第一个问题，在 .h 文件中声明你的控制器如下:

to rectify the first issue, declare your controler in the .h file as follows:

#import "RestKit/RestKit.h"
...
@interface MyController : UIViewController<RKObjectLoaderDelegate>

你就这样投射:

- (void)objectLoader:(RKObjectLoader*)objectLoader didLoadObject:(id)object  { 
    Translation *myTranslation = (Translation*)object;
    ... 
} 

或者您可以通过调用适当的选择器来避免强制转换

or you can avoid the cast by calling appropriate selector

- (void)objectLoader:(RKObjectLoader*)objectLoader didLoadObject:(id)object  { 
    self.translation.text = [[object translatedText] translation];
} 

您可以使用 Translation 对象中 @properties 的定义更新您的问题，以确保此答案正确.

you may update your question with the definition of @properties in your Translation object in order to be sure this answer is correct.

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