How to Pause/Play NSTimer?

Question

I need to start NSTimer by 0:0:0 that I am doing and I have a Pause button on click of that the timer has to pause after some time if a user clicks play it has to run from paused value of time. How can I pause and play in NSTimer? Any help? Thanks in advance.

Are you just trying to keep track of some amount of elapsed time? NSTimer isn't really for that purpose. It's purpose is more-or-less to schedule events to fire within the run loop. — jmstone617, Apr 02 '12 at 11:32
possible duplicate of [Stopwatch using NSTimer incorrectly includes paused time in display](http://stackoverflow.com/questions/8101231/stopwatch-using-nstimer-incorrectly-includes-paused-time-in-display) — jscs, Apr 03 '12 at 01:42

Sam Parrish · Accepted Answer · 2012-04-02T15:25:09.763

Try this shizzle... worked great for me

EDIT

To be honest my actual code is this:

-(IBAction)clicked:(id)sender
{
    if ([startStop.titleLabel.text isEqualToString:@"Start"]) 
    {
        [startStop setTitle:@"Pause" forState:UIControlStateNormal];
        [startStop setTitleColor:[UIColor redColor] forState:UIControlStateNormal];

        timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(countUp) userInfo:nil repeats:YES];
        timerDown = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(countDown) userInfo:nil repeats:YES];

    } else if ([startStop.titleLabel.text isEqualToString:@"Pause"])
    {
        [startStop setTitle:@"Resume" forState:UIControlStateNormal];
        [startStop setTitleColor:[UIColor colorWithRed:0/255 green:0/255 blue:255/255 alpha:1.0] forState:UIControlStateNormal];

        pauseStart = [[NSDate dateWithTimeIntervalSinceNow:0] retain];
        previousFireDate = [[timer fireDate] retain];
        [timer setFireDate:[NSDate distantFuture]];

    } else if ([startStop.titleLabel.text isEqualToString:@"Resume"])
    {
        [startStop setTitle:@"Pause" forState:UIControlStateNormal];
        [startStop setTitleColor:[UIColor redColor] forState:UIControlStateNormal];

        float pauseTime = -1*[pauseStart timeIntervalSinceNow];
        [timer setFireDate:[NSDate dateWithTimeInterval:pauseTime sinceDate:previousFireDate]];
        [pauseStart release];
        [previousFireDate release];
    }
}

I used a UIButton and used this code when clicked.

remember to put this:

NSDate *pauseStart, *previousFireDate;

in your .h file

EDIT!

here is the countUp method. forget the down method. seconds, minutes, hours are Ints

- (void)countUp
{
    seconds += 1;

    if (seconds == 60) 
    {
        seconds = 0;
        minutes++;

        if (minutes == 60) 
        {
            minutes = 0;
            hours++;
        }
    }

}

how did u passed NSTimer parameter to those 2 methods? b'coz i have paused seconds in NSString,,, — taus-iDeveloper, Apr 02 '12 at 13:51
thanks for the update, i think u forgot to include countUp & countDown method code, can u plz let me know what is there inside those methods? — taus-iDeveloper, Apr 02 '12 at 14:34

zoul · Answer 2 · 2012-04-02T11:53:10.213

8

You don’t. Instead of pausing simply invalidate and release the old timer and when the users presses Play again, create a fresh timer.

edited Apr 02 '12 at 11:53

answered Apr 02 '12 at 11:30

zoul

102,279
44
260
354

thanks for the reply,how to create fresh timer?i mean to which NSTimer method i need to pass my PausedTime and how b'coz i'm having it in NSString format. – taus-iDeveloper Apr 02 '12 at 13:48

score 4 · Answer 3 · edited Sep 14 '13 at 07:36

refreshTimer should be on class level. Use the following code to stop the timer:

refreshTimer = [NSTimer scheduledTimerWithTimeInterval: refreshInSeconds
                                                target: self
                                              selector: @selector(refreshPage)
                                              userInfo: nil
                                               repeats: YES];
[refreshTimer invalidate];
refreshTimer = nil;

To start you can again schedule timer as Line 3

score 3 · Answer 4 · answered Apr 02 '12 at 11:48

Use following code to start timer with arguments also:

timer = [NSTimer scheduledTimerWithTimeInterval:time target:self selector:@selector(callMyMethod:) userInfo:[NSDictionary dictionaryWithObjectsAndKeys:web1, @"web", baseURL, @"baseURL", option1, @"option", nil] repeats:NO];

and then use

[timer invalidate];

to stop the timer.

I hope this code will help you.

Thanks.

score 2 · Answer 5 · answered Aug 05 '15 at 14:02

2

there is no such thing as pause for NSTimer, you have to stop and start it again.

[yourTimer invalidate]; //will stop the timer after which you can start it again

answered Aug 05 '15 at 14:02

Pawel Molodkin

135
5

score 0 · Answer 6 · answered Mar 14 '16 at 03:19

Updated answer for Swift 2

import UIKit

class ViewController: UIViewController {

  var myTimer = NSTimer()
  var time = 0 // global var

  @IBOutlet weak var counterLabel: UILabel!

  @IBAction func pauseTimer(sender: AnyObject) {
    myTimer.invalidate()
  }

  @IBAction func startTimer(sender: AnyObject) {
    myTimer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("result"), userInfo: nil, repeats: true) 
  }

  func result() {
    time++
    counterLabel.text = String(time)
    print(time) 
  }

  override func viewDidLoad() {
    super.viewDidLoad()
  }

  override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
  }
}

How to Pause/Play NSTimer?

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