您好，我正在开发基于 Web 服务的 iPhone 应用程序，但问题是我的客户端提供了以下格式的 Web 服务，我不知道如何解析它。我将不胜感激任何帮助或任何人分享他们的经验。
{"消息":"[{\"APPROVER_ID\":\"DAMIN_V\",\"APPROVER_USER_NAME\":\"DAMIN\",\"START_DATE\":\"04/04/12\",\" END_DATE\":\" \",\"SUBSTITUTE_ID\":\"HLAD\",\"SUBSTITUTE_USER_NAME\":\"James\"},{\"APPROVER_ID\":\"DAMIN_V\",\"APPROVER_USER_NAME \":\"DAMIN\",\"START_DATE\":\"06/01/12\",\"END_DATE\":\"\",\"SUBSTITUTE_ID\":\"LucyE\",\" SUBSTITUTE_USER_NAME\":\"Lucy\"},{\"APPROVER_ID\":\"HLAD\",\"APPROVER_USER_NAME\":\"James\",\"START_DATE\":\"04/16/12\ ",\"END_DATE\":\"\",\"SUBSTITUTE_ID\":\"HT\",\"SUBSTITUTE_USER_NAME\":\"HTx\"},{\"APPROVER_ID\":\"HLAD\",\"APPROVER_USER_NAME\":\"James\",\"START_DATE\":\"06/13/12\ ",\"END_DATE\":\"\",\"SUBSTITUTE_ID\":\"SUPERMAN\",\"SUBSTITUTE_USER_NAME\":\"james\"},{\"APPROVER_ID\":\"我的组织用户\",\"APPROVER_USER_NAME\":\"我的 ORG 用户 1\",\"START_DATE\":\"06/13/12\",\"END_DATE\":\"06/16/12\", \"SUBSTITUTE_ID\":\"NFALPR1\",\"SUBSTITUTE_USER_NAME\":\"Prince\"},{\"APPROVER_ID\":\"PEK\",\"APPROVER_USER_NAME\":\"Lucy E\" ,\"START_DATE\":\"03/01/12\",\"END_DATE\":\"08/08/12\",\"SUBSTITUTE_ID\":\"HRL\",\"SUBSTITUTE_USER_NAME\":\"James\"},{\"APPROVER_ID\":\"PNAIR\",\"APPROVER_USER_NAME\":\"Carl\", \"START_DATE\":\"03/01/12\",\"END_DATE\":\"03/09/12\",\"SUBSTITUTE_ID\":\"SCHITRE\",\"SUBSTITUTE_USER_NAME\": \"Fun bobby\"},{\"APPROVER_ID\":\"LucyE\",\"APPROVER_USER_NAME\":\"Lucy\",\"START_DATE\":\"03/01/12\",\ "END_DATE\":\"03/31/12\",\"SUBSTITUTE_ID\":\"HLAD\",\"SUBSTITUTE_USER_NAME\":\"James\"},{\"APPROVER_ID\":\"LucyE E\",\"APPROVER_USER_NAME\":\"Lucy\",\"START_DATE\":\"04/01/12\",\"END_DATE\":\"04/30/12\",\"SUBSTITUTE_ID\":\"DAMIN_V\",\"SUBSTITUTE_USER_NAME\":\"DAMIN\"},{\"APPROVER_ID\":\" LucyE E\",\"APPROVER_USER_NAME\":\"Lucy\",\"START_DATE\":\"05/04/12\",\"END_DATE\":\"05/25/12\",\ "SUBSTITUTE_ID\":\"JOSHIA\",\"SUBSTITUTE_USER_NAME\":\"Joye\"}]","statusFlag":true}\"JOSHIA\",\"SUBSTITUTE_USER_NAME\":\"Joye\"}]","statusFlag":true}\"JOSHIA\",\"SUBSTITUTE_USER_NAME\":\"Joye\"}]","statusFlag":true}
提前致谢，尼廷。