start method

void start()

This Method Starts the Countdown Timer

Implementation

void start() {
  if (_isReverse) {
    _state._controller.reverse(
        from: _initialDuration == 0 ? 1 : 1 - (_initialDuration / _duration));
  } else {
    _state._controller.forward(
        from: _initialDuration == 0 ? 0 : (_initialDuration / _duration));
  }
}