Simple swift Stopwatch don't work

Question

This is my code.

//
    //  ViewController.swift
    //  Stopwatch
    //
    //  Created by Orkun Atasoy on 12.09.15.
    //  Copyright (c) 2015 Orkun Atasoy. All rights reserved.
    //


import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var timerLabel: UILabel!
    @IBOutlet weak var timerButton: UIButton!

    var timer : NSTimer?
    var ms = 0

    @IBAction func buttonTapped(sender: AnyObject) {

        timerButton.setTitle("Stopp", forState:UIControlState.Normal)

        self.timer = NSTimer.scheduledTimerWithTimeInterval(0.01, target: self, selector: Selector("update"), userInfo: nil, repeats: true)
    }


    func update() {
        self.ms++
        timerLabel.text = String(self.ms)enter code here
    }



}

The Problem is when i run the build it comes the introscreen with big text "Stopwatch" and the it is like freezed there. But it should come a label with button downside which has a text "start". When i click the button it should start counting and the label should change to "stopp". When i click again the it should stop the timer.

I dont get what the Problem ist. I am a Swift newbie. I would be pleased if you could help me.

Thank you for your attention

EDIT >> the label text is at the beginning "00:00".

score 1 · Accepted Answer · answered Sep 12 '15 at 12:29

Looks like you are messing with IBOutlet connections and I have corrected some of your code and here is working code:

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var timerLabel: UILabel!
    @IBOutlet weak var timerButton: UIButton!

    var timer : NSTimer?
    var ms = 0

    override func viewDidLoad() {

        timerLabel.text = "00:00"
    }

    @IBAction func buttonTapped(sender: AnyObject) {

        if timerButton.currentTitle == "Stopp" {
            timer?.invalidate()
            timerButton.setTitle("Start", forState:UIControlState.Normal)
        } else {

            timerButton.setTitle("Stopp", forState:UIControlState.Normal)

            self.timer = NSTimer.scheduledTimerWithTimeInterval(0.01, target: self, selector: Selector("update"), userInfo: nil, repeats: true)
        }
    }

    func update() {
        self.ms++
        timerLabel.text = String(self.ms)

    }
}

And First of all remove all outlets from your storyboard view controller and connect it this way:

And if you want check THIS sample project.

Happy to help you..:) – Dharmesh Kheni Sep 12 '15 at 12:39 — Dharmesh Kheni, Sep 12 '15 at 12:39

score 0 · Answer 2 · answered Sep 12 '15 at 12:22

The method you call when the timer fires is incorrect. From the documentation:

The selector should have the following signature: timerFireMethod: (including a colon to indicate that the method takes an argument). The timer passes itself as the argument, thus the method would adopt the following pattern: - (void)timerFireMethod:(NSTimer *)timer

So your method should be:

func update(timer: NSTimer) {
    self.ms++
    timerLabel.text = String(self.ms)
}

And you should set up your timer as:

NSTimer.scheduledTimerWithTimeInterval(0.01, target: self, selector: "update:", userInfo: nil, repeats: true)

There are a few more things I could mention - such as no need to use self when unambigously using variables, and using a dispatch timer instead of an NSTimer, but this should at least solve your immediate problem.

it works! I solved it with that: http://stackoverflow.com/questions/26442414/libcabi-dylib-terminating-with-uncaught-exception-of-type-nsexception-lldb — Orkun Atasoy, Sep 12 '15 at 12:34

Simple swift Stopwatch don't work

2 Answers2