Swift：在十进制文本字段输入

Question

我有几个带小数键盘的文本字段，我想让它们在屏幕上显示$和逗号（$ 1,222,000.00）。并且还会更改文本的间距，因为添加逗号时会很拥挤。

for textField in self.numberTextField! as [UITextField] {
        textField.keyboardType = .DecimalPad
        textField.inputAccessoryView = keyboardToolbar

numberTextField是我的文本字段集合。任何帮助赞赏！非常感谢！

Answer 1

func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
    let oldText = textField.text! as NSString
    var newText = oldText.stringByReplacingCharactersInRange(range, withString: string) as NSString!
    var newTextString = String(newText)

    let digits = NSCharacterSet.decimalDigitCharacterSet()
    var digitText = ""
    for c in newTextString.unicodeScalars {
        if digits.longCharacterIsMember(c.value) {
            digitText.append(c)
        }
    }

    let formatter = NSNumberFormatter()
    formatter.numberStyle = NSNumberFormatterStyle.CurrencyStyle
    formatter.locale = NSLocale(localeIdentifier: "en_US")
    let numberFromField = (NSString(string: digitText).doubleValue)/100
    newText = formatter.stringFromNumber(numberFromField)

    textField.text = String(newText)

    return false

}