确定哪个 textFormField 出现错误？

Question

I have multiple textFormField on the page. Is it possible to identify which textForm got error?

I create custom Text Form Field

            CustomTextField(
              controller: oneLineDes
              validator: validatePhone),

I create mixin for validation

class ValidationMixin {

  String validatePhone(String value){
    String patttern = r'(^(?:[+0]9)?[0-9]{9,12}$)';
    RegExp regExp = RegExp(patttern);
    if (!regExp.hasMatch(value)) {
      return 'Please enter valid Phone Number';
    }
    return null;
  }
}

onPressed looks like this

 onPressed: () {
         if (_formKey.currentState.validate()) {
}}

I need like this:

 if (_formKey.currentState.validate()) {
 }else{
    if(phoneError){
     //show snackBar
    }

    if(emailError){
    //show snackBar
    }
}

Answer 1

使用key:带有ValueKey(unique identification number for your widget)的TextFormField属性ValueKey(unique identification number for your widget)