Making an incremental counter for scores - cocos2d-iphone

Question

How can I make a counter that will increment (run through) from zero to the score attained within two seconds? I plan to use this for displaying the final score in game over popup. I am not really too sure how to go about this. Please help.

Answer 1

Following is the code you can use to setup your animation (using scheduler) according to given values:
float secs = 2.0f;
float deciSecond = 1 / 10;
newScore = 100;
currentScore = 0;
scoreInDeciSecond = (newScore / secs) * deciSecond;
[self schedule:#selector(counterAnimation) interval:deciSecond];
And this is how your method will handle the animation:
- (void)counterAnimation {
currentScore += scoreInDeciSecond;
if (currentScore >= newScore) {
currentScore = newScore;
[self unschedule:#selector(counterAnimation)];
}
scoreLabel.string = [NSString stringWithFormat:#"%d", currentScore];
}

Answer 2

I personally don't know cocos2d and how it displays text or uses timers, but here is how to do it with pure iOS SDK. If you know cocos2d, it shouldn't be a problem converting it.
- (void)viewDidLoad
{
[super viewDidLoad];
highScoreLabel = [[UILabel alloc] initWithFrame:CGRectMake(100.0, 100.0, 200.0, 75.0)];
[self displayHighScore];
}
-(void)displayHighScore {
highScore = 140;
currentValue = 0;
NSString* currentString = [NSString stringWithFormat:#"%d", currentValue];
[highScoreLabel setText:currentString];
[self.view addSubview:highScoreLabel];
int desiredSeconds = 2; //you said you want to accomplish this in 2 seconds
[NSTimer scheduledTimerWithTimeInterval: (desiredSeconds/highScore) // this allow the updating within the 2 second range
target: self
selector: #selector(updateScore:)
userInfo: nil
repeats: YES];
}
-(void)updateScore:(NSTimer*)timer {
currentValue++;
NSString* currentString = [NSString stringWithFormat:#"%d", currentValue];
[highScoreLabel setText:currentString];
if (currentValue == highScore) {
[timer invalidate]; //stop the timer because it hit the same value as high score
}
}