addOnCardAbsentCallback method

void addOnCardAbsentCallback(
  1. void callback()
)
inherited

Adds a callback to be invoked when the RFID reader no longer detects an RFID card.

This is useful for triggering actions when an RFID card leaves the reader's detection field, such as updating UI elements to reflect the absence of the card.

Example:

reader.addOnCardAbsentCallback(() {
  print('Card removed!');
});

Implementation

void addOnCardAbsentCallback(void Function() callback) {
  _onCardAbsentCallbacks.add(callback);
}