如果选择了Page2，则在点击Page1 / Page3时 GestureDetector 工作正常 . 同样适用于Page3并点击Page2 / Page4 . 另外Page4并点击Page3工作正常，但是一旦选择了Page1，第2页上的点击将完全不起作用 . 我的错误在哪里或者这只是一个错误？

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home:MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatelessWidget {
  MyHomePage({this.title});
  final String title;

  _createBox(String title, Color color) {
    return Center(
      child: GestureDetector(
        onTap: () => print("Tapped on $title."),
        child: Container(
          width: 200,
          height: 200,
          color: color,
          child: Center(
            child: Text(title),
          ),
        ),
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(title),
      ),
      body: Center(
        child: Container(
          width: 300,
          height: 300,
          color: Colors.yellow,
          child: PageView(
            controller: PageController(viewportFraction: 0.7),
            children: <Widget>[
              _createBox("Box 1", Colors.green),
              _createBox("Box 2", Colors.blue),
              _createBox("Box 3", Colors.green),
              _createBox("Box 4", Colors.blue),
              _createBox("Box 5", Colors.green),
            ],
          ),
        ),
      ),
    );
  }
}

Screenrecord

dart flutter