countdown timer with minutes and seconds - objective-c

Question

i create a countdown timer that go from 10 to 0. i create a uilabel that shows the counter in seconds. now i want the label to show the counter minutes and second, like that: 00:00.
how can i do that?
here is my countdowncode:
-(void)countdown
{
countdownCounter -= 1;
countdown.text = [NSString stringWithFormat:#"%i", countdownCounter];
}
-(IBAction)strat:(id)sender
{
countdownCounter = 10;
countdownTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:#selector(countdown) userInfo:nil repeats:YES];
}
}
thanks!

Answer 1

This can be done using one time, and one label. Try using the following code:
int seconds = [countDown.text intValue] % 60;
int minutes = ([countDown.text intValue] / 60) % 60;
countDown.text = [NSString stringWithFormat:#"%2d:%02d", minutes, seconds];

Answer 2

Do it exactly the same way, just add another timer.
countdownTimer2 = [NSTimer scheduledTimerWithTimeInterval:60.0 target:self selector:#selector(countdown2) userInfo:nil repeats:YES];
-(void)countdown2
{
countdownCounterMinutes -= 1;
}
and change countdown to
-(void)countdown
{
countdownCounter -= 1;
countdown.text = [NSString stringWithFormat:#"%i%i", countdownCounterMinutes, countdownCounter];
}

Answer 3

for anyone who what the answer in the end i do it this way:
-(IBAction)start
{
timer = [NSTimer scheduledTimerWithTimeInterval:.01 target:self selector:#selector(updateTimer:) userInfo:nil repeats:YES];
}
-(void)updateTimer:(NSTimer *)timer {
currentTime -= 10 ;
[self populateLabelwithTime:currentTime];
if(currentTime <=0)
[timer invalidate];
}
- (void)populateLabelwithTime:(int)milliseconds {
seconds = milliseconds/1000;
minutes = seconds / 60;
hours = minutes / 60;
seconds -= minutes * 60;
minutes -= hours * 60;
NSString * result1 = [NSString stringWithFormat:#"%#%02d:%02d:%02d:%02d", (milliseconds<0?#"-":#""), hours, minutes, seconds,milliseconds%1000];
result.text = result1;
}
in viewDidLoad i set currentTime for the countdown time in milliseconds.
hope you understand...

Answer 4

I formatted the numbers (from float)with mins and seconds
it this way, thanks your answers helped. (hope this helps another)
- (void)ticTimer
{
self.current -= self.updateSpeed;
CGFloat progress = self.current / self.max;
[self populateLabelwithTimeFormatted:self.current];
/// TimeLabelNode.text = [NSString stringWithFormat:#"%f", progress];
// * Time is over
if (self.current <= self.min) {
[self stop];
_TimeLabelNode.text= #"time up!";
}
}
- (void)populateLabelwithTimeFormatted:(float)time {
//convert float into mins and seconds format
int mytime = (int) _current;
int seconds = mytime%60;
int minutes = mytime / 60 % 60;
NSString * result1 = [NSString stringWithFormat:#"%2d:%02d", minutes, seconds];
_TimeLabelNode.text = result1;
}