I am trying to create a listview screen, but there is an error in the 'myChildren' part. What could be the cause?

enter image description here

CodePudding user response：

Either move myChildren to _MyHomePageState class or replace myChildren with widget.myChildren in build method.

Also everytime when build method calls you add 50 text widgets to myChildren. Is this what you need?

CodePudding user response：

You can also use it like this.

import 'package:flutter/material.dart';

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

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  List<Widget> myChildren = [];

  @override
  void initState() {
    WidgetsBinding.instance.addPostFrameCallback((_) {
      for(var i = 0; i<50;i  ){
        myChildren.add(const Text('Hellow World'));
      }
      setState(() {});
    });
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Example'),
      ),
      body: myChildren.isEmpty
          ? const SizedBox()
          : ListView.builder(
            itemCount: myChildren.length,
              itemBuilder: (BuildContext context, int index) {
                return myChildren[index];
              },
            ),
    );
  }
}