简单的计时器－swift

import UIKit

class 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)
        
    }