시, 분, 초 계산 방법

   CFTimeInterval _ticks;

    _ticks += 0.1;

    double seconds = fmod(_ticks, 60.0);

    double minutes = fmod(trunc(_ticks / 60.0), 60.0);

    double hours = trunc(_ticks / 3600.0);

    self.timerLabel.text = [NSString stringWithFormat:@"%02.0f:%02.0f:%04.1f", hours, minutes, seconds];

    

    NSLog(@"tick = %f text = %@", _ticks, self.timerLabel.text);

2014-09-24 02:59:49.241 TabbedBanner[961:60b] tick = 0.100000 text = 00:00:00.1

2014-09-24 02:59:49.341 TabbedBanner[961:60b] tick = 0.200000 text = 00:00:00.2

2014-09-24 02:59:49.441 TabbedBanner[961:60b] tick = 0.300000 text = 00:00:00.3

...

2014-09-24 02:59:53.141 TabbedBanner[961:60b] tick = 4.000000 text = 00:00:04.0

2014-09-24 02:59:53.241 TabbedBanner[961:60b] tick = 4.100000 text = 00:00:04.1

2014-09-24 02:59:53.341 TabbedBanner[961:60b] tick = 4.200000 text = 00:00:04.2

2014-09-24 02:59:53.441 TabbedBanner[961:60b] tick = 4.300000 text = 00:00:04.3

...

2014-09-24 03:03:35.186 TabbedBanner[961:60b] tick = 224.900000 text = 00:03:44.9

2014-09-24 03:03:35.286 TabbedBanner[961:60b] tick = 225.000000 text = 00:03:45.0

2014-09-24 03:03:35.386 TabbedBanner[961:60b] tick = 225.100000 text = 00:03:45.1

2014-09-24 03:03:35.486 TabbedBanner[961:60b] tick = 225.200000 text = 00:03:45.2

2014-09-24 03:03:35.586 TabbedBanner[961:60b] tick = 225.300000 text = 00:03:45.3

2014-09-24 03:03:35.686 TabbedBanner[961:60b] tick = 225.400000 text = 00:03:45.4