Question

我在viewController中有两个文本字段。一个是“金额”，一个是“利率”。对于“金额”，我使用委托函数来控制何时输入，它会自动添加逗号和$。这是代码：

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

    newText = formatter.stringFromNumber(numberFromField)
    if newText.isEqualToString("$0.00") {
        newText = ""
    }

    //        let attributedString = NSMutableAttributedString(string: newText as String)
    //        attributedString.addAttribute(NSKernAttributeName, value: CGFloat(0.05), range: NSRange(location: 0, length: newText.length))
    //
    //        textField.attributedText = attributedString

    textField.text = String(newText)

    return false

}

对于“利率”，我想让输入自动添加％并限制为只有一个小数点。我怎么能意识到它已经有了一个委托功能。

Answer 1

var amountTextField: UITextField?
var interestRateTextField: UITextField?

func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {

    if textField == amountTextField {
        // Do you stuff with amountTextField
    } else if textField == interestRateTextField {
        // Do you stuff with interestRateTextField
    }

    return false

}

Swift两个用于textfield的委托函数

1 个答案: