How can I use Animated switcher without a button in Flutter

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I have multiple widgets I want to fade in one after another but without needing a button. Every tutorial I have seen has required the use of a button in order to transition to the next widget. The widgets I want to transition take up the whole screen .

flutter-animation flutter-layout dart
1 Answers

How do you want to trigger the transition?

If time is a suitable trigger.


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

  @override
  State<MyStatefulWidget> createState() => _MyStatefulWidgetState();
}

class _MyStatefulWidgetState extends State<MyStatefulWidget> {
  late Timer timer;
  int count = 0;

  @override
  void initState() {
    super.initState();
    timer = Timer.periodic(Duration(seconds: 1), (_) => setState(() => count += 1));
  }

  @override
  void dispose() {
    super.dispose();
    timer.cancel();
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      color: Colors.white,
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: <Widget>[
          AnimatedSwitcher(
            duration: const Duration(milliseconds: 500),
            transitionBuilder: (Widget child, Animation<double> animation) {
              return ScaleTransition(child: child, scale: animation);
            },
            child: Text(
              '$count',
              key: ValueKey<int>(count),
              style: Theme.of(context).textTheme.headline4,
            ),
          ),
        ],
      ),
    );
  }
}
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