Display a number in a label but have it count up the number

Question

I have a UILabel in my class and I would like the view to display the number but to count up to the number. For example, If the number was 368, it would climb quickly to the 250-300's then start to slow down as it gets to the number. Now this number will not always be 368, the number varies. It could be 6 or 129 or 1023 so it can't be a set-in-stone number. I obviously know how to create the UILabel as I already have it being used in my app, I just need help with counting upwards to it.

I have a "Player view", blah blah blah they get a score and it is passed to another view "Gameover view" and the score is display in a the UILabel.

Here is the code for the "Player view" to pass the data:

//finalScore is a int and so is currentScore
    second.finalScore = self.currentScore;

Here is the code for the "Gameover view" to pass the data:

- (void)viewWillAppear:(BOOL)animated {
    // scoreLabel is the IBOutlet to the UILabel in IB for displaying the score.    
    self.currentIndex++;
    if(self.currentIndex == [self.numbersArray count]) self.currentIndex = 0;

    self->scoreLabel.text = [NSString stringWithFormat:@"%d",self->finalScore];
}

Thanks in advance!

possible duplicate of [Animating a UITextView increasing or decreasing the value of a number](http://stackoverflow.com/questions/18807849/animating-a-uitextview-increasing-or-decreasing-the-value-of-a-number) — pasawaya, Oct 06 '13 at 00:27

score 1 · Accepted Answer · answered Oct 06 '13 at 01:00

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I figured it out myself. I found this control and it works just as I need it to! Click Here

answered Oct 06 '13 at 01:00

Kyle Greenlaw

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score 0 · Answer 2 · edited May 23 '17 at 12:02

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You can update the UILabel object in a loop, using the Timer. As time progresses at a certain interval, "slow it down" by adding on the difference in time. Sample code for updating a UI object via Timer is a common bit of code on the Internet, as it's the way you code progress bars.

how to use the progress bar in the iphone app

edited May 23 '17 at 12:02

Community

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answered Oct 05 '13 at 23:38

Anna Billstrom

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The only thing is, is I need the number as if is for the game I a built. – Kyle Greenlaw Oct 05 '13 at 23:40
You're going to do the timer in another thread - and update the ui label as you go, much as the progress bar "progresses" as it goes. – Anna Billstrom Oct 05 '13 at 23:58

score 0 · Answer 3 · edited Nov 15 '13 at 08:07

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Just call this method every certain interval (ex every 0.1 seconds), using a NSTimer

It will increment the value up to the target number.

-(void)countUp:(id)sender {
    int targetNumber = yourNumber;
    int currentNumber = [[myLabel text] intValue];

    // Calculate the increment for this time. Mess with this for different speeds. 
    // Just multiply some of the numbers by some constants (ex. 2) until you 
    // achieve the desired effect.
    double increment = (targetNumber - currentNumber) / targetNumber;
    NSString *newValue = [NSString stringWithFormat:@"%f",currentNumber + increment];
    [myLabel setText:newValue];
    if ([newValue doubleValue] >= targetValue) {
        [(NSTimer *)sender invalidate];
    }


}

For the timer:

[NSTimer scheduledTimerWithInterval:0.1 
                             target:self 
                           selector:@selector(countUp:) 
                           userInfo:nil 
                            repeats:YES];

edited Nov 15 '13 at 08:07

Alex Cio

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answered Oct 05 '13 at 23:44

Andrew

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@KyleGreenlaw change yourNumber to whatever represents the number that you want your label to eventually show. – Andrew Oct 05 '13 at 23:48
I think I got it, I will do a test and let you know but I think this is the answer I need. – Kyle Greenlaw Oct 05 '13 at 23:48
When the view shows, the number is just (in this case) 302.00000000 and did not count up – Kyle Greenlaw Oct 06 '13 at 00:00
@KyleGreenlaw did you do `[myLabel setText:]` ? If you do, then delete that line because you don't want to do that because then it won't increment. – Andrew Oct 06 '13 at 00:04
@KyleGreenlaw Also, I just changed something in my answer. Update your code for that. Also, I just realized that you may need to rewrite the increment calculation completely if it goes up to the wrong number. Im not sure how accurate it will be :/ – Andrew Oct 06 '13 at 00:08
@KyleGreenlaw On this line: `self->scoreLabel.text = [NSString stringWithFormat:@"%d",self->finalScore];` you need to start the timer as described in answer – Andrew Oct 06 '13 at 00:31
@KyleGreenlaw In the method that is described in the answer, you need to change all references of targetNumber to self->finalScore and remove targetNumber's declaration. – Andrew Oct 06 '13 at 00:34
Ok, and how would start the timer on that line? – Kyle Greenlaw Oct 06 '13 at 00:37
@KyleGreenlaw See bottom of my answer. – Andrew Oct 06 '13 at 00:37
Im am get the nsstring to nstimer alert. – Kyle Greenlaw Oct 06 '13 at 00:39
let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/38676/discussion-between-kyle-greenlaw-and-santa-claus) – Kyle Greenlaw Oct 06 '13 at 00:40

score 0 · Answer 4 · answered Nov 15 '13 at 08:10

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using literals it become quite easy to play

 UILabel * label;
 label.text = @(label.text.integerValue+1).stringValue;

answered Nov 15 '13 at 08:10

Nicolas Manzini

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Display a number in a label but have it count up the number

4 Answers4