在输入时逐字母地验证UITextField文本

Posted 2021-04-07

所以我对我的文本域进行了验证，如果验证为真，我的按钮将被启用，如果验证为假，我的按钮将被禁用。问题是验证仅在我单击键盘中的完成按钮后运行。

我想逐字逐句地进行验证检查。

这是我的代码：

func textFieldDidEndEditing(_ textField: UITextField) {
    if (nomorTextField.text!.count >= 10) {
        nextButton.isEnabled = true
        nextButton.backgroundColor = #colorLiteral(red: 1, green: 0.4431372549, blue: 0.003921568627, alpha: 1)

        if(nomorTextField.text!.count > 13) {
            nextButton.isEnabled = false
            nextButton.backgroundColor = #colorLiteral(red: 0.662745098, green: 0.662745098, blue: 0.662745098, alpha: 1)
        }
        else if emailTextFeild.text == "" {
            nextButton.isEnabled = true
            nextButton.backgroundColor = #colorLiteral(red: 1, green: 0.4431372549, blue: 0.003921568627, alpha: 1)
        }
        else if emailTextFeild.text?.isEmail == false {
            nextButton.isEnabled = false
            nextButton.backgroundColor = #colorLiteral(red: 0.662745098, green: 0.662745098, blue: 0.662745098, alpha: 1)
        }
    }
    else {
        nextButton.isEnabled = false
        nextButton.backgroundColor = #colorLiteral(red: 0.662745098, green: 0.662745098, blue: 0.662745098, alpha: 1)
    }
}

答案

您还可以将其作为IBAction从故事板连接（如果您使用的是故事板）

附：不要忘记将类型更改为UITextField，并将事件更改为ValueChanged。

另一答案

您应该使用不同的委托方法 -

文本框（_：shouldChangeCharactersIn：replacementString :)

在文本字段中更改字符之前调用此方法。您应该始终返回true，因为在您的情况下，您不希望阻止文本编辑。但是，您需要使用新字符更新已编辑的文本字段文本，以确保计数正确。

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {

    // Casting String as NSString to be able to replace characters using NSRange easily.
    guard let text = textField.text as NSString? else { return true }

    // Get the length of the final text
    let finalTextCount = text.replacingCharacters(in: range, with: string).count

    // Setup the text count for the field depending on which one was edited
    let nomorTextFieldCount = textField == nomorTextField ? finalTextCount : 
    nomorTextField.text!.count

    if nomorTextFieldCount >= 10 {

        nextButton.isEnabled = true
        nextButton.backgroundColor = #colorLiteral(red: 1, green: 0.4431372549, blue: 0.003921568627, alpha: 1)

        if nomorTextFieldCount > 13 {

            nextButton.isEnabled = false
            nextButton.backgroundColor = #colorLiteral(red: 0.662745098, green: 0.662745098, blue: 0.662745098, alpha: 1)

        }else if emailTextFeild.text == "" {

            nextButton.isEnabled = true
            nextButton.backgroundColor = #colorLiteral(red: 1, green: 0.4431372549, blue: 0.003921568627, alpha: 1)

        }else if emailTextFeild.text?.isEmail == false{

            nextButton.isEnabled = false
            nextButton.backgroundColor = #colorLiteral(red: 0.662745098, green: 0.662745098, blue: 0.662745098, alpha: 1)

        }
    }else{

        nextButton.isEnabled = false
        nextButton.backgroundColor = #colorLiteral(red: 0.662745098, green: 0.662745098, blue: 0.662745098, alpha: 1)

    }

   return true
}