checkIfEmpty method Null safety

String? checkIfEmpty(
  1. TextEditingController textEditingController
)

Checks if the value of a given TextEditingController is empty. Used for the errortext on TextField.

Implementation

static String? checkIfEmpty(TextEditingController textEditingController) {
  final text = textEditingController.text;
  if (text.isEmpty) {
    return 'Kann nicht leer sein';
  }
  // return null if the text is valid
  return null;
}