isTimeOfDay method
check is the value is TimeOfDay
Implementation
FieldValidator<String?, TimeOfDay> isTimeOfDay(
[MessageCallBack<String>? message]) {
return next((messages, value) {
if (!value.isTimeOfDay) {
return message?.call(messages, value) ?? messages.isTimeOfDay;
}
return null;
}).transform((value) => value.toTimeOfDay()!);
}