iPhone: NSTimer Countdown (Display Minutes:Seconds)

Question

I have my timer code set up, and it's all kosher, but I want my label to display "Minutes : seconds" instead of just seconds.

-(void)countDown{

    time -= 1;

    theTimer.text = [NSString stringWithFormat:@"%i", time];

    if(time == 0)
    {
    [countDownTimer invalidate];
    }
}

I've already set "time" to 600, or 10 minutes. However, I want the display to show 10:59, 10:58, etc. until it reaches zero.

How do I do this?

Thanks!

Noah Witherspoon · Accepted Answer · 2011-04-13T23:07:52.313

19

int seconds = time % 60;
int minutes = (time - seconds) / 60;
theTimer.text = [NSString stringWithFormat:@"%d:%.2d", minutes, seconds];

edited Apr 13 '11 at 23:07

answered Apr 13 '10 at 03:16

Noah Witherspoon

57,021
16
130
131

That's great! However, once the seconds gets below ten it shows "9:9", "9:8", etc. Is there a way to make that "9:09", "9:08"? – user298261 Apr 13 '10 at 06:25
5

Sure. `NSString *padZero = @""; if(seconds < 10) padZero = @"0"; theTimer.text = [NSString stringWithFormat:@"%i:%@%i",minutes,padZero,seconds];` – Noah Witherspoon Apr 13 '10 at 14:31
11

I'd rather use printf formatting for padding numbers like that: `[NSString stringWithFormat:@"%d:%.2d", minutes, seconds]` – Daniel Bauke Apr 13 '10 at 15:42
guys how to declare time. – Mss iOS Jan 06 '17 at 11:12

score 0 · Answer 2 · answered Jul 26 '16 at 15:26

By the time, I was made a little upgrade of first answer, it removed conflicts that associated from NSInteger and int:

NSInteger secondsLeft = 987;
int second = (int)secondsLeft % 60;
int minutes = ((int)secondsLeft - second) / 60;
theTimer.text = [NSString stringWithFormat:@"%02d:%02d", minutes, second]];

iPhone: NSTimer Countdown (Display Minutes:Seconds)

2 Answers2