how can I insert a decimal number using UIKeyboardTypeNumberPad format?

I am developing a app, taking hotel name开发者_开发问答 and price name so I am using UITextField for them, and when I am inserting price, I am using UIKeyboardTypeNumberPad, but unfortunately there is return key, no done key and no decimal key, because price can be like 15.22$, so what is solution for this?

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use numbers & punctuation keyboard

textField.keyboardType=UIKeyboardTypeNumbersAndPunctuation;

EDIT:

The UIKeyboardTypeDecimalPad type only shows them, but is only available in 4.1 and later.