带首字母的UitextFiled必须为0,格式为(0)1234 56789

时间:2019-05-29 12:22:50

标签: ios swift iphone uitextfield

我正在使用电话号码texfield,现在我在texfield(#)#### #####中使用这种格式,现在的问题是我希望将第一个字符0强制性化,例如(0)1234 56789 ,因此用户输入的任何第一个字符都必须输入0,其不可重复的查询号格式不同

这是我的代码,但是不起作用

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
    var oldText = (textField.text! as NSString).replacingCharacters(in: range, with: string)
    if oldText.count > 15 { return false }
    oldText = oldText.replacingOccurrences(of: "(0)", with: "").replacingOccurrences(of: " ", with: "")
    if !oldText.isEmpty {
        oldText = "(0)" + oldText
    }
    let newText = String(stride(from: 0, to: oldText.count, by: 3).map {
        let sIndex = String.Index(encodedOffset: $0)
        let eIndex = oldText.index(sIndex, offsetBy: 3, limitedBy: oldText.endIndex) ?? oldText.endIndex
        return String(oldText[sIndex..<eIndex])
        }.joined(separator: " "))
    textField.text = newText
    return false
}

1 个答案:

答案 0 :(得分:1)

在这种格式(#) #### #####中,仅使用两个空格。因此,您可以在没有这样的for循环的情况下在特定索引处插入空间

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
    var oldText = (textField.text! as NSString).replacingCharacters(in: range, with: string)
    if oldText.count > 14 { return false }
    oldText = oldText.replacingOccurrences(of: "(0)", with: "").replacingOccurrences(of: " ", with: "")
    if !oldText.isEmpty {
        oldText = "(0)" + oldText
    }
    if oldText.count > 3 { 
        oldText.insert(" ", at: oldText.index(oldText.startIndex, offsetBy: 3))
    }
    if oldText.count > 8 {
        oldText.insert(" ", at: oldText.index(oldText.startIndex, offsetBy: 8))
    }
    textField.text = oldText
    return false
}