带 2 位小数的逗号分隔数字 - swift

Question

我有一个文本字段，它输入的是价格，所以我想像这样获得两者：1,111,999.99。我写信使它成为可能，但有两个问题。首先，在四位数字和 2 个小数位（如 1,234.00）之后，它会重置为零。其次，我不能在里面放小数（小数总是 .00）我怎样才能制作一个接收 1,111,999.99 作为输入的文本字段？

在我的自定义 UITextfield 中：

private var numberFormatter: NumberFormatter {
    let formatter = NumberFormatter()
    formatter.maximumFractionDigits = 2
    formatter.minimumFractionDigits = 0
    formatter.numberStyle = .decimal
    formatter.decimalSeparator = "."
    formatter.groupingSeparator = ","
    return formatter
}

var commaValue: String {
    return numberFormatter.string(from: value)!
}

var value: NSNumber {
    let number = numberFormatter.number(from: self.text ?? "0")
    return number!
}

在我的 textfieldDidChange 方法中：

@IBAction func textfieldEditingChanged(_ sender: Any) {
    let textfield = sender as! UITextField
    textfield.text = textfield.commaValue
}

Answer 1

暂时这样解决了：

var formattedNumber: String {
    guard self.text != "" else {return ""}
    var fraction = ""
    var digit = ""

    let fractionExists = self.text!.contains(".")

    let num = self.text?.replacingOccurrences(of: ",", with: "")
    let sections = num!.characters.split(separator: ".")
    if sections.first != nil
    {
        let str = String(sections.first!)
        let double = Double(str)
        guard double != nil else {return self.text ?? ""}
        digit = numberFormatter.string(from: NSNumber(value: double ?? 0))!
    }
    if sections.count > 1
    {
        fraction = String(sections[1])
        if fraction.characters.count > 2
        {
            fraction = String(fraction.prefix(2))
        }
        return "\(digit).\(fraction)"
    }
    if fractionExists
    {
        return "\(digit)."
    }
    return digit
}

.

@IBAction func textfieldEditingChanged(_ sender: Any) {
    let textfield = sender as! UITextField
    textfield.text = textfield.formattedNumber
}

带 2 位小数的逗号分隔数字 - swift

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