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，我无法创建一个简单的Json POST请求。
我有一个NSDictionary包含用户和密码，我想把这些值作为Json发送到服务器，并得到一个响应。我有工作没有使用restkit，但我不能弄清楚如何使用RestKit完成相同的，只是不能找到一个很好的例子我想要的。

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;
}

服务器正在等待这样的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
}

我知道有一个Json解析器包括在RestKit，但我找不到任何关于如何解析我的rpcData字典的文档，我需要使用一个外部库。

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?.

与服务器它的确定，但我不发送什么是预期的。我的字典映射方式是key = value？key2 = value2 ...。这是一个非常愚蠢的问题，但我被困。

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

em>当我写这个，它工作，但Restkit已更新，所以我不知道这将工作，请检查他们的文档

By the time I wrote this, it worked but Restkit has been updated so I'm not sure if this will work, please check their documentation

这里是我的问题的解决方案，我正在做的是理想的工作与RPC API，当你需要调用一个服务：

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.-首先在你的对象你需要导入Restkit和RKRequestSerialization，这是非常重要的：

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函数：

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

I有同样的问题，这是什么解决了我。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];
}

我的关键是最后一行中的MIMEType：RKMIMETypeJSON。因为我只想使用RKRequest，这是我需要设置MIME类型。否则，我会使用Paul Cezanne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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