Question

我是objective-c的新手，需要提交json对象的集合。

我写了以下内容：

NSDictionary *jsonDictionary = [NSDictionary dictionaryWithObjectsAndKeys:
                                id, @"id",
                                toClientGroupType, @"toClientGroupType",
                                dueDate, @"dueDate",
                                actionDate, @"actionDate",
                                campaignType, @"campaignType",
                                campaignCategory, @"campaignCategory",
                                businessId, @"businessId",
                                promotion, @"promotion",
                                product, @"product",
                                contentF, @"content",
                                subject, @"subject",
                                nil];
NSData *jsonData2 = [NSJSONSerialization dataWithJSONObject:jsonDictionary options:NSJSONWritingPrettyPrinted error:&error];
NSString *jsonString = [[NSString alloc] initWithData:jsonData2 encoding:NSUTF8StringEncoding];
NSLog(@"jsonData as string:\n%@", jsonString);
[request setURL:[NSURL URLWithString:@"https://services-dev.a.com/api/channels"]];
[request setHTTPMethod:@"POST"];
[request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
[request setHTTPBody:jsonData2];

我有两个问题：

一个。 jsonData作为String的输出是

{
      "toClientGroupType" : "VIP",
      "id" : "1",
      "dueDate" : "2012-09-03 10:25:42 +0000",
      "actionDate" : "2012-09-03 10:25:42 +0000",
      "campaignType" : "ONE_TIME",
      "businessId" : "150",
      "campaignCategory" : "SALE"
    }

如你所见 - 我遗漏了3个我宣布的fiels：content，product和subject

B中。我实际上需要提交一个对象数组，所以请求将是这样的：

[{
  "toClientGroupType" : "VIP",
  "id" : "1",
  "dueDate" : "2012-09-03 10:25:42 +0000",
  "actionDate" : "2012-09-03 10:25:42 +0000",
  "campaignType" : "ONE_TIME",
  "businessId" : "150",
  "campaignCategory" : "SALE"
}]

我该怎么办？出了什么问题？

Answer 1

NSDictionary *jsonDictionary = [NSDictionary dictionaryWithObjectsAndKeys:
                            id, @"id",
                            toClientGroupType, @"toClientGroupType",
                            dueDate, @"dueDate",
                            actionDate, @"actionDate",
                            campaignType, @"campaignType",
                            campaignCategory, @"campaignCategory",
                            businessId, @"businessId",
                            promotion, @"promotion",
                            product, @"product",
                            contentF, @"content",
                            subject, @"subject",
                            nil];


NSMutableArray * arr = [[NSMutableArray alloc] init];

[arr addObject:jsonDictionary];
NSData *jsonData2 = [NSJSONSerialization dataWithJSONObject:arr options:NSJSONWritingPrettyPrinted error:&error];
NSString *jsonString = [[NSString alloc] initWithData:jsonData2 encoding:NSUTF8StringEncoding];
NSLog(@"jsonData as string:\n%@", jsonString);

结帐这个

Answer 2

 NSError *error;
NSDictionary *jsonDictionary = [NSDictionary dictionaryWithObjectsAndKeys:
                                @"1", @"id",
                                @"test", @"toClientGroupType",
                                @"test", @"dueDate",
                                @"test", @"actionDate",
                                @"test", @"campaignType",
                                @"test", @"campaignCategory",
                                @"test", @"businessId",
                                @"test", @"promotion",
                                @"test", @"product",
                                @"test", @"content",
                                @"test", @"subject",
                                nil];


NSMutableArray * arr = [[NSMutableArray alloc] init];

[arr addObject:jsonDictionary];
NSData *jsonData2 = [NSJSONSerialization dataWithJSONObject:arr options:NSJSONWritingPrettyPrinted error:&error];
NSString *jsonString = [[NSString alloc] initWithData:jsonData2 encoding:NSUTF8StringEncoding];
NSLog(@"jsonData as string:\n%@", jsonString);

输出： - [ { “主题”：“测试”， “toClientGroupType”：“test”， “id”：“1”， “dueDate”：“测试”， “actionDate”：“测试”， “campaignType”：“测试”， “businessId”：“测试”， “产品”：“测试”， “内容”：“测试”， “campaignCategory”：“测试”， “促销”：“测试” } ]

查看促销，产品，内容和主题中的数据。不应为零或空

Answer 3

问题A：

我认为您的字段已丢失，因为它们包含nil值。使用NSJSONSerialization

时，不会考虑包含nil值的键

问题B：

prashant发布了一个好solution

Answer 4

-(void)connectionDidFinishLoading:(NSURLConnection *)connection{

NSError *error;

NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:receivedData options:NSJSONReadingAllowFragments error:&error];

 NSArray *categoryArray= [dic valueForKey:@"SELECTED OBJECT KEY"];
    NSLog(@"category%@",categoryArray);
}

类别：显示类别数组内容

在objective c中创建json对象数组

4 个答案: