How to resign first responder when entering currency

Question

I'd like to make my text field resign first responder after the cents are entered in a text field for entering currency. I'm using UIKeyboardTypeDecimalPad so only numerals are entered. When the second numeral after the decimal point is entered I want the text field to resign first responder.

1

12

123

123.4

123.45 now resign first responder.

Do I have the delegate compare the text to the regular expression *\... for each textDidChange notification? Starting counting when . is entered?

Is there a way to apply NSNumberFormatter and setMaximumFractionDigits:2 to the text input field?

Answer 1

I believe it would be a bad user experience if you dismissed the keyboard after 2 digits from the decimal place. (Also wouldn't work for fraction-less currencies, such as Yen).

To dismiss a keyboard like this, the easiest option would be to dismiss the keyboard when the user touches outside of the keyboard area. You could do this by applying a `UITapGestureRecognizer' on the view just behind the keyboard when bringing it up, then removing it once the keyboard is dismissed.