NonStopTickerProviderMixin

main.dart

import 'package:flutter/material.dart';
import 'package:flutter/scheduler.dart';

mixin NonStopTickerProviderMixin implements TickerProvider {
  @override
  Ticker createTicker(TickerCallback onTick) => Ticker(onTick);
}

void main() {
  runApp(MaterialApp(home: const Init()));
}

class Init extends StatelessWidget {
  const Init({Key key}) : super(key: key);

  @override
  Widget build(BuildContext context) => Scaffold(
        body: Center(
          child: FlatButton(
            child: const Text('init'),
            onPressed: () => Navigator.of(context).push(
              MaterialPageRoute(
                builder: (context) => const Page(),
              ),
            ),
          ),
        ),
      );
}

class Page extends StatefulWidget {
  const Page({Key key}) : super(key: key);

  @override
  _PageState createState() => _PageState();
}

class _PageState extends State<Page> with NonStopTickerProviderMixin {
  AnimationController animationController;

  @override
  void initState() {
    animationController = AnimationController(duration: Duration(seconds: 1), vsync: this)
      ..forward()
      ..addStatusListener((animationStatus) {
        if (animationStatus == AnimationStatus.completed) animationController.forward(from: 0);
      });
    super.initState();
  }

  @override
  void dispose() {
    animationController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) => Scaffold(
        body: AnimatedBuilder(
          animation: animationController,
          builder: (context, child) {
            print('_PageState.build -> AnimatedBuilder.builder');
            return Center(
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: <Widget>[
                  FlatButton(
                    child: const Text('push'),
                    onPressed: () => Navigator.of(context).push(MaterialPageRoute(builder: (context) => Container())),
                  ),
                  FlatButton(
                    child: const Text('pop'),
                    onPressed: Navigator.of(context).pop,
                  ),
                ],
              ),
            );
          },
        ),
      );
}