dismiss the UIKeyboardTypeDecimalPad in UIScrollView background

I am dealing with what seems to be a somewhat rudimentary pr开发者_如何学Coblem. I am trying to dismiss a UIKeyboardTypeDecimalPad that has a UIScrollView background. I have seen some solutions that involve putting a done button where the decimal is if you have just a NumberPad. The problem is, I really need a decimal.

My next thought was to dismiss the keypad when the user touches the background, but since the background is a scroll view, I couldn't seem to connect an action to pick up a touch? One solution was to perhaps created a Custom Scroll View Controller...all of this seems a bit messy just to dismiss a keypad. Do I really have to do this?

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Would it work for you if you put a UIBarButtonItem "Done" in your navigation bar? Have you explored the UITextField property inputAccessoryView?