如何在swift中重置viewcontroller

Question

如何在swift中重置秒表？这是我的代码

@IBAction func resetButton(sender: UIButton) {
    self.viewDidLoad()
    self.viewWillAppear(Bool)
}
@IBAction func stopButton(sender: UIButton) {
    print(stopwatch.elapsedTime)
    stopwatch.stop()
}