ios - 使用 NSTimer.scheduledTimerWithTimeInterval 函数发送到实例的无法识别的选择器

Question

我需要每分钟运行一次的函数。所以我决定使用 NSTimer.scheduledTimerWithTimeInterval 函数

这是我的代码

override func viewWillAppear(animated: Bool) {
        refreshDealData()
        NSTimer.scheduledTimerWithTimeInterval(60.0, target: self, selector: Selector("runCountDownFunction:"), userInfo: nil, repeats: true)
    }

func runCountDownFunction()
    {
        NSLog("hello World")
        self.countDownTime = self.now.timeIntervalSinceDate(self.dealDateAndTime)
        self.duration = Int(self.countDownTime)
        self.duration = abs(self.duration)

        var countDownHours = self.duration / 3600
        var countDownMinutes = (self.duration % 3600) / 60
        var countDownSeconds = (self.duration % 3600) % 60
        var countDownDays = countDownHours / 24
        var countDownHoursDisplay = countDownHours % 24
        self.mCountDown.text = "\(countDownDays)D \(countDownHoursDisplay)H \(countDownMinutes)M"

    }

但是我在 viewWillAppear 1 分钟后收到此错误

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[RockStarTable.DealInsideViewController runCountDownFunction:]: unrecognized selector sent to instance 0x7f91ed8c8000'

有人知道怎么解决吗？谢谢!

Answer 1

您的选择器是 "runCountDownFunction:"。冒号是有意义的；这意味着此方法采用一个参数。因此，您必须使您的方法采用一个参数。像这样声明你的方法:

func runCountDownFunction(timer:NSTimer) {

现在它的签名与您在创建计时器时提供的选择器匹配。