简单的计时器－swift

import UIKitclass ViewController: UIViewController {        var time = 0        func result(){        time++        print(time)    }    override func viewDidLoad() {        super.viewDidLoad()                var timer = NSTimer()        timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: ("result"), userInfo: nil, repeats: true)            }