How to invalidate NSTimer in iOS application correctly?

Question

I am new in ios application development. I want to set countdown timer of 30 min in my application so I had put this code in my application it is working but in below code it will continue start from 30 minutes again and again and again. I want to exit that exam page on completing 30 minutes so how can I do this can any one help me please .

thank you

CountDown Timer ios tutorial?

that examples predates arc - call invalidate like said in the comments — Daij-Djan, May 29 '14 at 10:24
possible duplicate of [CountDown Timer ios tutorial?](http://stackoverflow.com/questions/17145112/countdown-timer-ios-tutorial) — Daij-Djan, May 29 '14 at 10:25

score 0 · Answer 1 · answered May 29 '14 at 10:14

0

Remove this secondsLeft = 16925; from updateCounter.

- (void)updateCounter:(NSTimer *)theTimer {
    if(secondsLeft > 0 ){
        secondsLeft -- ;
        hours = secondsLeft / 3600;
        minutes = (secondsLeft % 3600) / 60;
        seconds = (secondsLeft %3600) % 60;
        myCounterLabel.text = [NSString stringWithFormat:@"%02d:%02d:%02d", hours, minutes, seconds];
    }
    else{
        if(timer != nil)
        {
            [timer invalidate];
            timer = nil;
        }
        //Write the code to exit your exam page
    }
}

Hope this helps.. :)

answered May 29 '14 at 10:14

Rashad

11,057
4
45
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it move's towered end test in less than one second i mean instantly moves in end test. – user3652356 May 29 '14 at 11:43
You just asked what to do, Customize it in your way. :) – Rashad May 30 '14 at 02:57

score 0 · Accepted Answer · answered May 29 '14 at 10:28

0

I think you does not need to add Timer for this task.

You can simple call your method like :

[self performSelector:@selector(yourMethod) withObject:nil afterDelay:1800];

Now it will call your method after 30 minutes or say 1800 seconds.

answered May 29 '14 at 10:28

Sandeep Singh

268
1
9

thanks for helping me.. it is really work thanks again – user3652356 May 29 '14 at 14:03

How to invalidate NSTimer in iOS application correctly?

2 Answers2