PageController animateToPage

main.dart

import 'package:flutter/material.dart';

void main() => runApp(const MyApp());

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

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  final controller = PageController();

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        appBar: AppBar(
          title: const Text('FlutterZero'),
        ),
        body: PageView(
          controller: controller,
          children: [
            Center(
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  Text('Page 1'),
                  SizedBox(
                    height: 20,
                  ),
                  ElevatedButton(
                    onPressed: () => controller.animateToPage(
                      1,
                      duration: Duration(seconds: 1),
                      curve: Curves.easeIn,
                    ),
                    child: Text('Page 2に移動'),
                  )
                ],
              ),
            ),
            Center(
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  Text('Page 2'),
                  SizedBox(
                    height: 20,
                  ),
                  ElevatedButton(
                    onPressed: () => controller.animateToPage(
                      0,
                      duration: Duration(seconds: 1),
                      curve: Curves.easeIn,
                    ),
                    child: Text('Page 1に移動'),
                  )
                ],
              ),
            )
          ],
        ),
      ),
    );
  }
}