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在我的iPhone应用程序中,我有一个自定义对象列表.我需要从它们创建一个json字符串.我如何用SBJSON或iPhone sdk实现这个？

 NSArray* eventsForUpload = [app.dataService.coreDataHelper fetchInstancesOf:@"Event" where:@"isForUpload" is:[NSNumber numberWithBool:YES]];
    SBJsonWriter *writer = [[SBJsonWriter alloc] init];  
    NSString *actionLinksStr = [writer stringWithObject:eventsForUpload];

我得到空的结果.

我正在尝试使用Json序列化objc对象以将其发送到服务器.

同一服务器在GET上为此对象类型发送以下内容:

 {
   "TypeProperties":[
      {"Key":"prop 0","Value":"blah 0"},
      {"Key":"prop 1","Value":"blah 1"},
      {"Key":"prop 2","Value":"blah 2"},
      {"Key":"prop 3","Value":"blah 3"}
     ],
   "ImageURls":[
      {"Key":"url 0","Value":"blah 0"},
      {"Key":"url 1","Value":"blah 1"},
      {"Key":"url 2","Value":"blah 2"},
      {"Key":"url 3","Value":"blah 3"}
     ]
}

SBJsonWriter为我在objc中创建的匹配对象/类型生成以下内容:

{
  "TypeProperties": {
    "key 2": "object 2",
    "key 1": "object 1",
    "key 4": "object 4",
    "key 0": "object 0",
    "key 3": "object 3"
  },
  "ImageUrls": {
    "key 0": "url 0",
    "key 1": "url 1",
    "key 2": "url 2"
  }
}

这就是我使用SBJsonWriter的方式:

SBJsonWriter *writer = [[SBJsonWriter alloc] init]; …