PNDate在swift中返回nil

Question

我用左 PubNub.requestFullHistoryForChannel(channel , includingTimeToken: true , withCompletionBlock: { messages , channel , startDate , endDate , error in let dic = messages[0].message as Dictionary<String , String> let date = messages[0].date as PNDate! })
获取历史消息 当我使用println（）来显示消息时**日期：PNDate **不是nil

 "PNMessage (0x7fcb69d252c0): <message: {\n    text = yup;\n    type = fromUser;\n}, date: PNDate (0x7fcb69d25300) <date: 2015-02-17 12:21:31 +0000; time token: 14241756912535903>, channel: Hazem>"

Answer 1

我可以从

获取发送消息的时间

let date = messages[i].receiveDate  as PNDate