格式化聊天窗口

Question

我正在尝试为iOS构建消息传递应用程序。我有一个返回JSON的Web服务，但我不知道如何让它显示在应用程序的可滚动，格式化的区域。我也对如何让它ping服务器以检查更新一无所知，并且如果已经发布了流，则刷新流。我们将非常感谢您提供的任何帮助。

这是我正在使用的基本JSON：

{
  "messages": [
    {
      "id": "1",
      "location_id": "1",
      "origination_id": "1",
      "message": "Test message",
      "timestamp": "2014-01-16 08:57:26"
    },
    {
      "id": "2",
      "location_id": "1",
      "origination_id": "1",
      "message": "Test Message - start",
      "timestamp": "2014-01-16 09:00:50"
    },
    {
      "id": "3",
      "location_id": "1",
      "origination_id": "2",
      "message": "Test response",
      "timestamp": "2014-01-16 09:01:06"
    },
    {
      "id": "6",
      "location_id": "1",
      "origination_id": "1",
      "message": "This is a test message from the API",
      "timestamp": "2014-01-16 10:23:11"
    },
    {
      "id": "7",
      "location_id": "1",
      "origination_id": "1",
      "message": "This is a test message from the API",
      "timestamp": "2014-01-16 10:23:13"
    },
    {
      "id": "8",
      "location_id": "1",
      "origination_id": "1",
      "message": "This is a test message from the API",
      "timestamp": "2014-01-16 10:23:22"
    }
  ]
}