Swift/Xcode -向UITextField添加货币符号和逗号

let numberFormatter = NumberFormatter()

numberFormatter.currencySymbol = "$"
numberFormatter.numberStyle = .decimal

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
    // 获取当前文本框的文本
    let currentText = textField.text ?? ""
    
    // 获取将要替换的文本
    let replacementText = (currentText as NSString).replacingCharacters(in: range, with: string)
    
    // 格式化文本
    if let formattedText = numberFormatter.string(from: NSNumber(value: Int(replacementText)!)) {
        textField.text = formattedText
    }
    
    return false
}