Question about a custom keyboard and appending a string

[aaronsbush]

I am working with a custom keyboard (numberpad with a decimal point added) that I got from this thread: http://www.iphonedevsdk.com/forum/ip...-keyboard.html. There is another example of this at: Billabonger.net » Blog Archive » Add a Decimal to UITextField : Number Pad Keyboard

These are great examples and it put me in the right direction, but this code seems to only work well in one view with one text field. The app I am creating uses multiple views and multiple text fields that use this custom keyboard. If I click to another view and go back to the original view's text field or select another text field in the same view the decimal point is then added twice. The code used to add the decimal point is stringByAppendingString:@"."

Any ideas on how to release or remove the appended string when a view is switched or a different text field is selected? Since I'm new to programming I am lost... Any thoughts are greatly appreciated!