Provider
用途
Provider.of()の書き方が変わった
code:provider.dart
// Provider.of<CounterController>(context, listen: false);
context.read<CounterController>();
// Provider.of<CounterState>(context, listen: true).count;
context.watch<CounterState>().count;
// Provider.of<CounterState>(context, listen: true).count;
context.select<CounterState, int>((state) => state.count);
ref