输入后逐个字母验证UITextField文本

Question

因此我对我的文本字段进行了验证，如果验证为true，则将启用我的按钮，如果验证为false，则将禁用我的按钮。问题是只有在单击键盘上的“完成”按钮后才能运行验证。

我要一个字母一个字母地进行验证检查。

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)
    }
}

Answer 1

您也可以从情节提要中将其作为IBAction连接（如果使用情节提要）

P.S。不要忘记将类型更改为UITextField，将事件更改为ValueChanged。

Answer 2

您应该使用其他委托方法-

  

textField（_：shouldChangeCharactersIn：replacementString：）

在文本字段中更改字符之前立即调用此方法。您应该始终返回true，因为在您的情况下，您不想阻止文本编辑。但是，您确实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
}