如何配置文本字段以说明到期日期？ [英] How do I configure the text field to account for the expiry date?

问题描述

我正在输入信用卡信息，我希望过期日期最多为5个字符4个数字，并在键入01后的前两个字符(即01/17)后自动输入"/"，并且只允许再输入两个字符"17"。

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

    }
    return true
}

推荐答案

尝试这样，它在我的端工作。

 func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool
{
    //Range.Lenth will greater than 0 if user is deleting text - Allow it to replce
    if range.length > 0
    {
        if range.location == 3 {
           var originalText = textField.text
           originalText = originalText?.replacingOccurrences(of: "/", with: "")
           textField.text = originalText
        }
        return true
    }

    //Dont allow empty strings
    if string == " "
    {
        return false
    }

    //Check for max length including the spacers we added
    if range.location >= 5
    {
        return false
    }

    var originalText = textField.text
    let replacementText = string.stringByReplacingOccurrencesOfString(" ", withString: "")

    //Verify entered text is a numeric value
    let digits = NSCharacterSet.decimalDigitCharacterSet()
    for char in replacementText.unicodeScalars
    {
        if !digits.longCharacterIsMember(char.value)
        {
            return false
        }
    }

    //Put / space after 2 digit
    if range.location == 2
    {
        originalText?.appendContentsOf("/")
        textField.text = originalText
    }

    return true
}

希望这对您有帮助。

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