UICountingLabel

Adds animated counting support to UILabel.

Setup

Simply initialize a UICountingLabel the same way you set up a regular UILabel:

UICountingLabel* myLabel = [[UICountingLabel alloc] initWithFrame:CGRectMake(10, 10, 100, 40)];
[self.view addSubview:myLabel];
[myLabel release];

You can also add it to your XIB file, just make sure you set the class type to UICountingLabel instead of UILabel and be sure to #import "UICountingLabel.h" in the header file.

Use

Set the format of your label. This will be filled with a single int or float (depending on how you format it) when it updates:

myLabel.format = @"%d";

Optionally, set the mode. The default is UILabelCountingMethodEaseInOut, which will start slow, speed up, and then slow down as it reaches the end. Other options are described below in the Methods section.

myLabel.method = UILabelCountingMethodLinear;

When you want the label to start counting, just call:

[myLabel countFrom:0 to:100];

You can also specify the duration. The default is 2.0 seconds.

[myLabel countFrom:0 to:100 withDuration:5.0f];

The full signature is:

[myLabel     countFrom:(float)startValue 
                    to:(float)endValue 
          withDuration:(NSTimeInterval)duration];

Formats

When you set the format property, the label will look for the presence of %(.*)d or %(.*)i, and if found, will cast the value to int before formatting the string. Otherwise, it will format it using a float.

If you're using a float value, it's recommended to limit the number of digits with a format string, such as @"%.1f" for one decimal place.

Because it uses the standard stringWithFormat: method, you can also include arbitrary text in your format, such as @"Points: %i".

Modes

There are currently four modes of counting.

UILabelCountingMethodLinear

Counts linearly from the start to the end.

UILabelCountingMethodEaseIn

Ease In starts out slow and speeds up counting as it gets to the end, stopping suddenly at the final value.

UILabelCountingMethodEaseOut

Ease Out starts out fast and slows down as it gets to the destination value.

UILabelCountingMethodEaseInOut

Ease In/Out starts out slow, speeds up towards the middle, and then slows down as it approaches the destination. It is a nice, smooth curve that looks great, and is the default method.