使用RESTKit做一个简单的json POST

Question

我是iOS开发的新手,我在制作一个简单的Json POST请求时遇到了麻烦.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.我没有使用restkit工作,但我无法弄清楚如何使用RestKit完成相同的工作,只是找不到我想要的好例子.

- (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;
}

服务器期待像这样的Json:

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

我知道RestKit中有一个Json解析器包含但是我找不到任何关于如何解析我的rpcData字典的文档,我是否需要使用外部库？

现在与服务器的通信没关系,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,但我被困了.

更新

当我写这篇文章时,它有效,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

以下是我的问题的解决方案,当您需要调用服务时,我正在做的事情非常适合使用RPC API:

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

#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:

- (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];
    }
}

Answer 1

对于较旧的RestKit

你的委托中可能有这样的东西:

    objectManager.serializationMIMEType = RKMIMETypeFormURLEncoded;

你希望它是:

    objectManager.serializationMIMEType = RKMIMETypeJSON;

对于RestKit v.20:

    // thanks  ColdLogic (from his comment)
    [objectManager setRequestSerializationMIMEType:RKMIMETypeJSON];

Answer 2

我遇到了同样的问题,这就是为我解决的问题.注意,在我的场景中,我只想访问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,关键是最后一行的'MIMEType:RKMIMETypeJSON'.因为我只想使用RKRequest,所以我需要设置MIME类型.否则,我会使用Paul Cezanne的建议.