使用 RESTKit 做一个简单的 json POST [英] Do a simple json POST using RESTKit

问题描述

我是 iOS 开发的新手，在发出简单的 Json POST 请求时遇到问题.我有一个包含用户和密码的 NSDictionary，我想将这些值作为 Json 发送到服务器并获得响应.我在不使用 restkit 的情况下进行了这项工作，但我无法弄清楚如何使用 RestKit 来完成同样的工作，并且找不到我想要的好例子.

I'm new to iOS development and I'm having trouble making a simple Json POST request. I have a NSDictionary containing an user and password and I want to send those values as a Json to a server and get a response. I had that working without using restkit but I can't figure out how to accomplish the same using RestKit and just can't find a good example of what I want.

- (bool) login{

    NSMutableDictionary* params = [[NSMutableDictionary alloc] init];
    [params setValue:self.email forKey:@"email"];
    [params setValue:self.password forKey:@"password"];    

    NSMutableDictionary* rpcData = [[NSMutableDictionary alloc] init];
    [rpcData setValue:@"2.0" forKey:@"jsonrpc"];
    [rpcData setValue:@"authenticate" forKey:@"method"];
    [rpcData setValue:@"" forKey:@"id"];
    [rpcData setValue:params forKey:@"params"];

    [[RKClient sharedClient] post:@"/api/rpc/" params:rpcData delegate:self];
    return nil;
}

服务器期待这样的 Json:

The server is expecting a Json like this:

{
    jsonrpc : '2.0',
    method : 'authenticate', // method name goes here
    params : {  // params are method-specific
        email : '[e-mail]',
        password : 'secret'
    },
    id : 2  // The id can be anything, it will be sent back with the response
}

我知道 RestKit 中包含一个 Json 解析器，但我找不到有关如何解析 rpcData 字典的任何文档，我需要使用外部库吗?.

I understand that there is a Json parser include in RestKit but I can't find any documentation on how to parse my rpcData dictionary, do I need to use an external library?.

现在与服务器的通信正常，但我没有发送预期的内容.我的字典以key=value?key2=value2..."的方式映射.这是一个非常愚蠢的问题，但我被卡住了.

Right now the communication with the server it's ok, but I'm not sending what is expected. My dictionary is mapped in the way "key=value?key2=value2...". This is very silly question but I'm stucked.

更新

到我写这篇文章的时候，它可以工作，但 Restkit 已经更新，所以我不确定这是否有效，请查看他们的文档

这是我的问题的解决方案，我所做的非常适合在需要调用服务时使用 RPC API:

Here is the solution to my problem, what I'm doing is ideal for working with RPC APIs when you need to call a service:

1.- 首先在你的对象中你需要导入 Restkit 和 RKRequestSerialization，这很重要:

1.- First in your object you need to import Restkit and RKRequestSerialization, this is very important:

#import <RestKit/RestKit.h>
#import <RestKit/RKRequestSerialization.h>

@interface myObject : NSObject <RKRequestDelegate,RKObjectLoaderDelegate>

2.- 这是发送帖子的登录功能:

2.- Here is the login function sending the post:

- (void) login:(NSString *)username :(NSString *)password{

    RKClient *myClient = [RKClient sharedClient];
    NSMutableDictionary *rpcData = [[NSMutableDictionary alloc] init ];
    NSMutableDictionary *params = [[NSMutableDictionary alloc] init];

    //User and password params
    [params setObject:password forKey:@"password"];
    [params setObject:username forKey:@"email"];

    //The server ask me for this format, so I set it here:
    [rpcData setObject:@"2.0" forKey:@"jsonrpc"];
    [rpcData setObject:@"authenticate" forKey:@"method"];
    [rpcData setObject:@"" forKey:@"id"];
    [rpcData setObject:params forKey:@"params"];

    //Parsing rpcData to JSON! 
    id<RKParser> parser = [[RKParserRegistry sharedRegistry] parserForMIMEType:RKMIMETypeJSON];
    NSError *error = nil;
    NSString *json = [parser stringFromObject:rpcData error:&error];    

    //If no error we send the post, voila!
    if (!error){
        [[myClient post:@"/" params:[RKRequestSerialization serializationWithData:[json dataUsingEncoding:NSUTF8StringEncoding] MIMEType:RKMIMETypeJSON] delegate:self] send];
    }
}

推荐答案

我遇到了同样的问题，这就是为我解决的方法.请注意，在我的场景中，我只想访问 RKRequest.

I had the same problem, and this is what solved it for me. Note, in my scenario, I only wanted to access RKRequest.

NSDictionarty *dict
NSError *error; 
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dict options:0 error:&error];

if (!jsonData) 
{
    NSAssert(FALSE, @"Unable to serialize JSON from NSDict to NSData"); 
} 
else 
{
    NSString *jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
    request.params = [RKRequestSerialization serializationWithData:[jsonString dataUsingEncoding:NSUTF8StringEncoding] MIMEType:RKMIMETypeJSON];
}

对我来说，关键是最后一行中的MIMEType:RKMIMETypeJSON".由于我只想使用 RKRequest，这就是我需要设置 MIME 类型的方式.否则，我会使用保罗塞尚的建议.

The key for me was the 'MIMEType:RKMIMETypeJSON' in the last line. Since I only wanted to use RKRequest, this was how I needed to set the MIME type. Otherwise, I would use Paul Cezanne's suggestion.

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