我有一个列表中的列列表,需要像类似的那样添加withcolumn,如下所示:
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
debugShowCheckedModeBanner: false,
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Stack(
overflow: Overflow.visible,
alignment: Alignment.center,
children: <Widget>[
Container(
height: 150,
width: 300,
color: Colors.red
),
Positioned(
bottom: -50,
child: Container(
height: 100,
width: 150,
color: Colors.green
),
),
],
),
),
);
}
}
让我澄清这个问题。我有一个数据类型为数组类型的结构的数据框,我需要使用爆炸来展平每个数组,例如:df.withcolumn(col1,explode(col1))如果需要创建一个通用函数来一次传递所有列,你该怎么办它?如果我使用for循环,则每个爆炸语句的数据都会加倍
如何在-B 64
中做到这一点?