Objective-C如何使用标题中的嵌套字典将数据发送到Http Post请求

Question

我已经学习 Objective-C 几个月了。在那段时间里，我已经能够做一个基本的发布请求，但是我今天看到了一个包含嵌套字典的发布请求的标题。我不确定如何将数据传递给这样的 API。

我的问题是如何将数据发布到此 API。如果您能指出相关的阅读材料和教程以及此复杂 API 请求等示例或给出答案，我将不胜感激。

API 标头如下所示：

    { "header":
   { "id": "2312b24c-5b83-46f0-8670-5edc2b1d1672",
     "parentId": "3gyy-w325e-bebd-ddsfsdf",
     "countryCode": "IRELAND",
     "timestamp": "2017-10-13T08:39:14.638Z" },
  "myinfo":
   { "User": "intro",
     "contactPerson": "Newbee",
     "contact": "00000000",
     "notes": "hey guys i am new"
       
   }
    
}

这是我的代码，我需要多个字典的帮助。

    __block NSMutableDictionary *resultsDictionary;
      SMAMobileAPI *api = [SMAMobileAPI sharedSMAMobileAPI];
      NSMutableDictionary *bodyParams = [[NSMutableDictionary alloc]init];

      NSMutableDictionary *header = [[NSMutableDictionary alloc]init];
      [header setValue:@"2312b23c-5b83-46f0-8670-5edc2b1d1672" forKey:@"id"];
      [header setValue:@"2e3a015e-bebd-ddsfsdf" forKey:@"parentId"];
      [header setValue:@“IRELAND" forKey:@"countryCode"];
      [header setValue:@"2017-10-13T08:39:14.638Z" forKey:@"timeStamp"];

      NSMutableDictionary *myinfo = [[NSMutableDictionary alloc]init];
      [Case setValue:@“intro" forKey:@“User"];
      [Case setValue:@“newbie" forKey:@"contactPerson"];
      [Case setValue:@"+254 724474140" forKey:@"contactPersonNo"];
      [Case setValue:@"iOS case" forKey:@"notes"];

      [bodyParams setValue:header forKey:@"header"];
      [bodyParams setValue:myinfo forKey:@“myinfo"];

    if ([NSJSONSerialization isValidJSONObject:bodyParams]) {//validate it
        NSError* error = nil;
        NSData* jsonData = [NSJSONSerialization dataWithJSONObject:bodyParams options:NSJSONWritingPrettyPrinted error: &error];
        NSString *jsonString = [[NSString alloc] initWithData:jsonData 
 encoding:NSUTF8StringEncoding];
        NSURL* url = [NSURL URLWithString:@“my URL"];
        NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:30.0];
        [request setHTTPMethod:@"POST"];//use POST
        [request setValue:@"application/json" forHTTPHeaderField:@"Accept"];
        [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
        [request setValue:[NSString stringWithFormat:@"%lu",(unsigned long)[jsonData length]] forHTTPHeaderField:@"Content-length"];
        [request setHTTPBody:jsonData];//set data
        __block NSError *error1 = nil;

        //use async way to connect network
        [NSURLConnection sendAsynchronousRequest:request queue:[[NSOperationQueue alloc] init] completionHandler:^(NSURLResponse* response,NSData* data,NSError* error)
        {
            if ([data length]>0 && error == nil) {
                resultsDictionary = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:&error1];
                NSLog(@"resultsDictionary is %@",resultsDictionary);
               [self hideLoading];

            } else if ([data length]==0 && error ==nil) {
                NSLog(@" download data is null");
                [self hideLoading];
            } else if( error!=nil) {
                NSLog(@" error is %@",error);
                [self hideLoading];
            }
        }];
    }
}

Answer 1

似乎将 NSDictionary 转换为 JSON 是您的实际问题。见文档https://developer.apple.com/documentation/foundation/jsonserialization

NSData *jsonData = [NSJSONSerialization dataWithJSONObject:yourDictionary
     options:NSJSONWritingPrettyPrinted error:&error];
NSString *jsonString = [[NSString alloc] initWithData:jsonData 
     encoding:NSUTF8StringEncoding];