Swift Signal SIGABRT error while making countdown timer? - swift

Question

I am working on a countdown timer for my app that starts counting down from 15. This is my code:
//
import UIKit
class ViewController2: UIViewController {
#IBOutlet weak var Timer: UILabel!
var countd = 15
//
//
override func viewDidLoad() {
super.viewDidLoad()
let time = NSTimer(timeInterval: 1.0, target: self, selector: "updateCounter", userInfo: nil, repeats: true)
Timer.text = String(countd)
NSRunLoop.mainRunLoop().addTimer(time, forMode: NSDefaultRunLoopMode)
}
func updateCounter(timer: NSTimer) {
Timer.text = String(countd)
if (countd > 0){
Timer.text = String(countd--)
Timer.text = String(countd)
}
}
// Do any additional setup after loading the view.
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}
However, when I run it, as soon as I get to the part with the timer I see the label flash 15 for a second but then it immediately crashes with the SIGABRT error. What can I do?

Answer 1

Change
selector: "updateCounter"
to
selector: "updateCounter:"
Please note that in Swift 2.2 it will become difficult to make this mistake (the compiler will warn), and in Swift 3 it will become impossible (string literal selector syntax will become illegal). You might want to update to Swift 2.2 now if you don't understand string literal selector syntax.