method createTicker

Source

@override
Ticker createTicker(TickerCallback onTick) {
  assert(() {
    if (_ticker == null)
      return true;
    throw new FlutterError(
      '$runtimeType is a SingleTickerProviderStateMixin but multiple tickers were created.\n'
      'A SingleTickerProviderStateMixin can only be used as a TickerProvider once. If a '
      'State is used for multiple AnimationController objects, or if it is passed to other '
      'objects and those objects might use it more than one time in total, then instead of '
      'mixing in a SingleTickerProviderStateMixin, use a regular TickerProviderStateMixin.'
    );
  });
  _ticker = new Ticker(onTick, debugLabel: 'created by $this');
  return _ticker;
}