［已解决］swift出错：NSForwarding: warning of class does not implement methodSignatureForSelector trouble ahead

class CalculateElapsedTime {
    let uniqueId:String

    var startTime:NSDate
    var endTime:NSDate

    var elapsedTimeInSec:Double {
        let diffTimeInSec:Double = self.endTime.timeIntervalSinceDate(self.startTime)
        return diffTimeInSec
    }
   
    init(uniqueId:String = ""){
        self.uniqueId = uniqueId

        self.startTime = NSDate()
        self.endTime = self.startTime
       
//        start()
    }

    func start() -> NSDate {
        self.startTime = NSDate()
        self.endTime = self.startTime
       
        return self.startTime
    }
   
    func stop() -> Double {
        self.endTime = NSDate()
       
        return elapsedTimeInSec
    }

                let calcTime = CalculateElapsedTime()
                let extraParas:Dictionary<String, AnyObject> = [
                    "calcTime" : calcTime,
                ]

                getUrlRespJsonDict_async(getUserIdUrl, extraParas: extraParas, respJsonDictHandler: getUserIdJsonDictHandler)

    func getUserIdJsonDictHandler(getJsonOk:Bool, extraParas:AnyObject?, respJsonDict:JSON) {
        /*
        decodedJsonDict=user-7aa7e3c3-bf8f-46e1-8cbe-3a5aad6e9dfb
        */
       
        if extraParas != nil {
            if var calcTime = extraParas!["calcTime"] {
                calcTime = calcTime as! CalculateElapsedTime
                let elapsedTime = calcTime!.stop()
                gLog.debug("elapsedTime=\(elapsedTime)")
            }

2016-03-30 19:40:08.276 简道[475:53604] *** NSForwarding: warning: object 0x13671e610 of class ‘ÁÆÄÈÅì.CalculateElapsedTime’ does not implement methodSignatureForSelector: — trouble ahead

Unrecognized selector -[简道.CalculateElapsedTime stop]

//class CalculateElapsedTime {
class CalculateElapsedTime: NSObject {
    let uniqueId:String

    var startTime:NSDate
    var endTime:NSDate

    var elapsedTimeInSec:Double {
        let diffTimeInSec:Double = self.endTime.timeIntervalSinceDate(self.startTime)
        return diffTimeInSec
    }
   
    init(uniqueId:String = ""){
        self.uniqueId = uniqueId

        self.startTime = NSDate()
        self.endTime = self.startTime
       
//        start()
    }

    func start() -> NSDate {
        self.reset()
       
        return self.startTime
    }
   
    func stop() -> Double {
        self.endTime = NSDate()
       
        return elapsedTimeInSec
    }

    func reset(){
        self.startTime = NSDate()
        self.endTime = self.startTime
    }

func calcTimeStart(uniqueId:String){
    gLog.debug("\(uniqueId)")

    let calcTime = CalculateElapsedTime()
    gCalcTime[uniqueId] = calcTime
}

func calcTimeEnd(uniqueId:String){
    if gCalcTime.keys.contains(uniqueId) {
        let calcTime = gCalcTime[uniqueId]!
        let elapsedTime = calcTime.stop()
        gLog.debug("\(uniqueId) elapsedTime=\(String(format: "%.4f", elapsedTime))")
        calcTime.reset()
    }

        calcTimeStart("loginWithUserid")
        getUrlRespJsonDict_async(genAuthUrl, extraParas: extraParas, respJsonDictHandler: getAcessTokenHandler)
    }
   
    func getAcessTokenHandler(getJsonOk:Bool, extraParas:AnyObject?, respJsonDict:JSON) {
        /*
        {
          "data" : "2bh3ertj1a7a7jfj8hut0t3k0k",
          "message" : "ok",
          "code" : 200
        }
        */

        calcTimeEnd("loginWithUserid")