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enum DataType {
  EMAIL,PHONE,TEXT,INTEGER,NAME
}

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class DynamicInput extends StatefulWidget {
  final String label,hint;
  ///type denotes number or string or email 
  final DataType type;
  final TextEditingController controller;
  
  ...
    
}
class _DynamicInputState extends State<DynamicInput>{

bettdouglas

flutter_validate: 1.0.0

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class TypesValidator extends AbstractValidator<String> {  ///the class responsible for validation logic
  DataType type;  ///The datatype we'll use
  String text;  ///the text that we'll validate

  TypesValidator(this.text, this.type) : super(text);
}

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    _validator.ruleFor('email', ()=>text) 
        ..notEmpty()  // enforces that the email should not be empty
        ..withMessage('Email cannot be empty')  //return message if the email is empty
        ..emailAddress()  //checks if the email is a valid email address -- validation
        ..withMessage('Enter a valid email'); //return message if email is empty

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    _validator.ruleFor('name', ()=>text)
        ..notEmpty()
        ..withMessage('Please enter a name')
        ..length(2, 30)
        ..withMessage('Please enter a reasonable name');

    _validator.ruleFor('email', ()=>text)
        ..notEmpty()
        ..withMessage('Email cannot be empty')
        ..emailAddress()

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  String validate(){
    switch (type) {
      case DataType.EMAIL:
        return validator.validateRuleFor('email').errorText;
        break;
      case DataType.INTEGER:
        return validator.validateRuleFor('int').errorText;
        break;
      case DataType.TEXT:
        return validator.validateRuleFor('text').errorText;

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class Validator {

  String text; ///the text to validate. This will be the controller.text value
  TypesValidator _validator;  //the validation object where we'll define our rules on
  DataType type;  ///the object that will do the validation for us 

  Validator(this.text,this.type){
    _validator = new TypesValidator(text,type);   //initialise the object to do validation
    this.create();    //define the rules to our validator object which will be a singleton that will handle multi-validation
  }

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  Widget build(BuildContext context) {
    return TextFormField(
      controller: widget.controller,
      keyboardType: keyBoardType(widget.type),
      validator: (str)=>validator(str), ///this is a function which returns the error message we defined using the validator object
      decoration: InputDecoration(
        hintText: widget.hint,
        labelText: widget.label,
        helperText: widget.hint,
      ),

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  String validator(String s) {
    var validator = Validator(s,widget.type).validator;
    switch (widget.type) {
      case DataType.EMAIL:
        return validator.validateRuleFor('email').errorText;
        break;
      case DataType.INTEGER:
        return validator.validateRuleFor('int').errorText;
        break;
      case DataType.TEXT: