NSTimer countdown skips last second (not using last milliseconds) - iphone

Question

I have a NS timer countdown which works perfectly fine thanks to your answers. However, my timer skips the last second so that it does not count the last 0s:99 ms . Is there anything wrong with my code? Best regards!
-(void) setTimer {
MySingletonCenter *tmp = [MySingletonCenter sharedSingleton];
tmp.milisecondsCount = 99;
tmp.secondsCount = 2;
tmp.countdownTimerGame = [NSTimer scheduledTimerWithTimeInterval:.01 target:self selector:#selector(timerRun) userInfo:nil repeats:YES];
}
-(void) timerRun {
MySingletonCenter *tmp = [MySingletonCenter sharedSingleton];
tmp.milisecondsCount = tmp.milisecondsCount - 1;
if(tmp.milisecondsCount == 0){
tmp.secondsCount -= 1;
if (tmp.secondsCount == 0){
//Stuff for when the timer reaches 0
[tmp.countdownTimerGame invalidate];
tmp.countdownTimerGame = nil;
tmp.lives = tmp.lives - 1;
NSString *newLivesOutput = [NSString stringWithFormat:#"%d", tmp.lives];
livesLabel.text = newLivesOutput;
if (tmp.lives == 0) {
timeLabel.text = #"0:00";
[self performSelector:#selector(stopped) withObject:nil afterDelay:2.0];
}
else {[self setTimer]; }
}
else
tmp.milisecondsCount = 99;
}
NSString *timerOutput = [NSString stringWithFormat:#"%2d:%2d", tmp.secondsCount, tmp.milisecondsCount];
timeLabel.text = timerOutput;
}

Answer 1

try to change this
-(void) setTimer {
MySingletonCenter *tmp = [MySingletonCenter sharedSingleton];
tmp.milisecondsCount = 100;// Change this from 99 to 100
tmp.secondsCount = 2;
tmp.countdownTimerGame = [NSTimer scheduledTimerWithTimeInterval:.01 target:self selector:#selector(timerRun) userInfo:nil repeats:YES];
}

Answer 2

For a start, get rid of
else {[self setTimer]; }
Otherwise you are restarting the timer every time that selector fires.
Next: swap these two around
tmp.secondsCount -= 1;
if (tmp.secondsCount == 0){
to
else {
tmp.secondsCount -= 1;
tmp.milisecondsCount = 99;
}
like so:
-(void) timerRun {
MySingletonCenter *tmp = [MySingletonCenter sharedSingleton];
tmp.milisecondsCount = tmp.milisecondsCount - 1;
if(tmp.milisecondsCount == 0){
if (tmp.secondsCount == 0){
//Stuff for when the timer reaches 0
[tmp.countdownTimerGame invalidate];
tmp.countdownTimerGame = nil;
tmp.lives = tmp.lives - 1;
NSString *newLivesOutput = [NSString stringWithFormat:#"%d", tmp.lives];
livesLabel.text = newLivesOutput;
if (tmp.lives == 0) {
timeLabel.text = #"0:00";
[self performSelector:#selector(stopped) withObject:nil afterDelay:2.0];
}
}
else
{
tmp.milisecondsCount = 99;
tmp.secondsCount -= 1;
}
}
NSString *timerOutput = [NSString stringWithFormat:#"%2d:%2d", tmp.secondsCount, tmp.milisecondsCount];
timeLabel.text = timerOutput;
}