Is there a way to fix the decimal point on the DecimalPad keyboard?

It's not a direct answer, but if it's for localization, shouldn't DecimalPad also show localization?

If you mean DB values and aggregates, NSNumberFormatter will interpret the numeric data in a format that matches your current user settings, so if you have a comma on the DecimalPad, you will interpret the comma as a decimal point.

let numberFormatter=NSNumberFormatter()
iflet value = numberFormatter.numberFromString(textField.text???") ?.doubleValue{
    print(value)
}

You will also use NSNumberFormatter() to display numeric values on the screen.

numberFormatter.maximumFractionDigits=10
textField.text=numberFormatter.stringFromNumber (123.456)
//->123,456 is displayed in Italian state

"If all the Japanese staff are ""localized"", they tend to be distracted by the translation of the wording that appears, but I think it would be better to localize ""decimal points"" and ""date format"" (Japanese style yyyy/MM/dd format is rarely used in Europe and the U.S.)