Iphone sdk countdown timer?

Question

I have a countdown timer in my game, and I'm trying to figure out how to make it show two decimal places and two decimal places in my table. Now it is counted as an integer and written as an integer. Any ideas?

-(void)updateTimerLabel{

     if(appDelegate.gameStateRunning == YES){

                            if(gameVarLevel==1){
       timeSeconds = 100;
       AllowResetTimer = NO;
       }
    timeSeconds--;
    timerLabel.text=[NSString stringWithFormat:@"Time: %d", timeSeconds];
}

    countdownTimer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(updateTimerLabel) userInfo:nil repeats:YES];

Answer 1

To have auxiliary updates, the timer interval must be <1. But the accuracy of NSTimer is about 50 ms, so scheduledTimerWithTimeInterval:0.01it will not work.

, , timeSeconds . - NSDate . , , esp. .

---

, , countdownTimer .

countdownTimer = [NSTimer scheduledTimerWithTimeInterval:0.67 target:self selector:@selector(updateTimerLabel) userInfo:nil repeats:YES];

, , centiseconds:

if(appDelegate.gameStateRunning == YES){
   if(gameVarLevel==1){
      timeCentiseconds = 10000;
      AllowResetTimer = NO;
   }
}
timeCentiseconds -= 67;

, 100 :

timerLabel.text=[NSString stringWithFormat:@"Time: %d.%02d", timeCentiseconds/100, timeCentiseconds%100];

---

double:

double timeSeconds;
...
if(appDelegate.gameStateRunning == YES){
   if(gameVarLevel==1){
      timeSeconds = 100;
      AllowResetTimer = NO;
   }
}
timeSeconds -= 0.67;
timerLabel.text=[NSString stringWithFormat:@"Time: %.2g", timeSeconds];