numberformatter（样式货币）删除不起作用

Question

下面是我用来格式化数字并将其重新分配回文本字段的代码。在删除文本时我遇到了一些问题，完整的文本被删除而不是逐个字符地删除，而且我也无法重新输入文本。请指导我解决这个问题。

let currencyFormatter = NumberFormatter()
let decimalFormatter = NumberFormatter()
var currentString = ""

func formatCurrency(_ string: String) {
    let numberFromField = (NSString(string: string).doubleValue)/100
    activeField?.text = currencyFormatter.string(from: NSNumber(value: numberFromField))
}

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
    if finalTextCount >= maxCharactersLimit && string != ""{
        return false
    }

    switch string {
    case "0","1","2","3","4","5","6","7","8","9":
        currentString += string
        if textField == kmMinTextField || textField == kmMaxTextField {
            formatKms(currentString)
        } else {
            formatCurrency(currentString)
        }
    default:
        if string.characters.count == 0 && currentString.characters.count != 0 {
            currentString = String(currentString.characters.dropLast())
            if textField == kmMinTextField || textField == kmMaxTextField {
                formatKms(currentString)
            } else {
                formatCurrency(currentString)
            }
        }
    }

    return false
}

Answer 1

我运行了您的代码，但没有遇到这些问题。如果您使用的是 XIB 或 Storyboard，请仔细检查是否未选中“编辑开始时清除”

另外，我需要设置变量来完成这项工作：

var maxCharactersLimit = 10

and in textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String)

let finalTextCount = textField.text?.characters.count != nil ? textField.text!.characters.count : 0