How do you make an count-up timer in Objective-C? - iphone

Question

I have looked everywhere but I cannot find out how to do so. I need a simple timer that can count up in milliseconds and can be stopped. (XCode 3.1, Objective-C, iPhone OS Development)

Answer 1

Am I just being daft or is "count-up timer" the same as a stopwatch.
If it is, check out this video tutorial

Answer 2

Here is the sample code which i have done one timer with minute, second, and mili seconds.. So, its helpful for you. And also do it release after not use..
-(void)showTime:(NSTimer *)sender
{
miniSeconds++;
if (miniSeconds == 10)
{
miniSeconds = 0;
seconds++;
if (seconds == 60)
{
seconds = 0;
minutes++;
}
}
timeLabel.text = [NSString stringWithFormat:#"%02i:%02i:%02i",minutes,seconds,miniSeconds];
}
-(void)nextLevelTime
{
[labelTimer invalidate];
miniSeconds = 0;
seconds = 0;
minutes = 0;
}
The nextLevel method use for to stop timer and release all thing..
Use it, I have done with this code..

Answer 3

NSTimer should do it:
Class Reference
Timer Programming Topics

Answer 4

#interface ViewController()
{
UILabel *progress;
NSTimer *timer;
int currMinute;
int currSeconds;
int currHours;
}
#end
#implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
progress=[[UILabel alloc] initWithFrame:CGRectMake(80, 15, 100, 50)];
progress.textColor=[UIColor redColor];
[progress setText:#"Time : 00:00:00"];
progress.backgroundColor=[UIColor clearColor];
[self.view addSubview:progress];
currMinute=00;
currSeconds=00;
currHours=00;
// Do any additional setup after loading the view, typically from a nib.
}
-(void)start
{
timer=[NSTimer scheduledTimerWithTimeInterval:1 target:self selector:#selector(timerFired) userInfo:nil repeats:YES];
}
-(void)timerFired
{
currSeconds+=1;
if(currSeconds==60)
{
currSeconds=0;
currMinute+=1;
if(currMinute==60)
{
currMinute=0;
currHours+=1;
}
}
[_progress setText:[NSString stringWithFormat:#"%#%02d%#%02d%#%02d",#"Time : ",currHours,#":",currMinute,#":",currSeconds]];
if(currMinute==2)//stop at 2 minute
{
[timer invalidate];
}
}