sample.dart

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>{
  
  ...

  Widget build(BuildContext context) {
      return TextFormField(
        controller: widget.controller,  //
        keyboardType: keyBoardType(widget.type), ///gets keyboardtype based on the DataTypes we defined
        validator: (str)=>validator(str), //validator function that checks the type of data needed and validates it 
        decoration: InputDecoration(
          hintText: widget.hint, //text input hint
          labelText: widget.label,  //text widget label
          helperText: widget.hint,
        ),
      );
    }
    ///This checks the current text in textinput form and 
    ///validates depending with the type of DataType we defined above
    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:
          return validator.validateRuleFor('text').errorText;
        case DataType.PHONE:
          return validator.validateRuleFor('phone').errorText;
        case DataType.NAME:
          return validator.validateRuleFor('name').errorText;
        default:
          return validator.validateRuleFor('text').errorText;
      }
    }
...
 
}