1. override
Ticker createTicker(TickerCallback onTick)

Creates a ticker with the given callback.

The kind of ticker provided depends on the kind of ticker provider.

Source 

@override
Ticker createTicker(TickerCallback onTick) {
  _tickers ??= new Set<_WidgetTicker>();
  final _WidgetTicker result = new _WidgetTicker(onTick, this, debugLabel: 'created by $this');
  _tickers.add(result);
  return result;
}