ios – 为什么NSTimer在swift中只运行一次

这是我启动计时器的代码

if let data = data {
        do{
            let resultJSON = try NSJSONserialization.JSONObjectWithData(data,options: [])
            requestClient.id = resultJSON["id"] as! Double
            self.timerResponse = NSTimer.scheduledTimerWithTimeInterval(1,target: self,SELEctor: "checkIfThereAreResponeses",userInfo: nil,repeats: truE)
            self.timerResponse!.fire()
        }catch{
        }
    }

如你所见,我正在调用一个名为checkIfThereAreResponses的函数

在该函数中,我有一个print语句,并且该print语句只打印一次,尽管我的计时器应该每1秒工作一次

我有什么遗失？

这就是功能

func checkIfThereAreResponeses(){
    if (requestClient!.id != nil) {
        let url = NSURL(String: "http://localhost:blablabla")
        let request = NSMutableURLrequest(URL: url)
        request.httpR_524_11845@ethod = "POST"

        let session = NSURLSession.sharedSession()

        task = session.dataTaskWithrequest(request,completionHandler: {(data,response,error) in
            if let error = error {
                print("error = \(error)")
            }



            if let data = data {
                do {
                    let resultJSONArray = try NSJSONserialization.JSONObjectWithData(data,options: []) as! NSArray
        bla bla bla

                }catch {
                    print("no responses yet = \(error)")
                }
            }
        })
        task!.resume()
    }else {
        print("not yet ")
    }
}

我收到JUST ONCE的印刷品还没有回复