validateWithSingleError method

@override String? validateWithSingleError(num value)

Validates the given value and returns a single error message if invalid.

Returns null if the value is valid.

This method must be implemented by subclasses to define custom validation logic.

Implementation

@override
String? validateWithSingleError(num value) {
  if (value < minValue || value > maxValue) {
    return loc.numberRangeError(minValue, maxValue);
  }
  return null;
}