在构建中无限调用 Flutter 函数

Question

我正在制作一个加载 CSV 并在屏幕上显示表格的应用程序，但加载函数在构建状态下被无限调用任何人都知道如何修复它我只想调用一次但我的代码调用了很多次次。

控制台截图如下:

代码如下:

import 'package:flutter/material.dart';
import 'package:csv/csv.dart';
import 'dart:async' show Future;
import 'package:flutter/services.dart' show rootBundle;

class TableLayout extends StatefulWidget {
  @override
  _TableLayoutState createState() => _TableLayoutState();
}
class _TableLayoutState extends State<TableLayout> {

  List<List<dynamic>> data = [];

  loadAsset() async {
    final myData = await rootBundle.loadString("asset/dreamss.csv");
    List<List<dynamic>> csvTable = CsvToListConverter().convert(myData);

    return csvTable;
  }
  void load() async{
    var newdata = await loadAsset();
    setState(() {
      data = newdata;
    });
    print("am i still being called called ");
  }

  @override
  Widget build(BuildContext context) {

    load();

    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text("Apps"),),
        //floatingActionButton: FloatingActionButton( onPressed: load,child: Icon(Icons.refresh),),
        body: ListView(
          children: <Widget>[
            Container(margin: EdgeInsets.only(top: 20.0),),
        Table(
          border: TableBorder.all(width: 1.0,color: Colors.black),
          children: data.map((item){
            return TableRow(
              children: item.map((row){
                return Text(row.toString(),style: TextStyle(fontSize: 20.0,fontWeight: FontWeight.w900),);
              }).toList(),
            );
          }).toList(),
        ),
    ]),
    ));
  }
}

Answer 1

这是解决方案。

@override
void initState() {
  super.initState();
  load(); // use it here
}


@override
Widget build(BuildContext context) {
  return MaterialApp(...); // no need to call initState() here
}