我想将交易添加到 Card #Flutter

如何解决我想将交易添加到 Card #Flutter

我正在尝试在单击 FlatButton 时添加列表但我无法添加输入标题和数量 我有这个错误

Screen shot ( Error )

Simulator Screen Shot - iPhone 12 Pro Max

主文件：

import 'package:flutter/material.dart';
import 'package:intl/intl.dart';
import 'package:testspeed3/passAddfun.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  final titleController = TextEditingController();
  final amountController = TextEditingController();

  final List transaction = [
    {
      'title': 'Home','amount': 44,'date': DateTime.now(),},// {
    //   'title': 'Muhammed',//   'amount': 22,//   'date': DateTime.now(),// },// {
    //   'title': 'BestPR',//   'amount': 11,];

  void SubmitData(var titleSub,double amountsub) {
    final NewList = [
      {
        'title': titleSub,'amount': amountsub,'date': '${DateTime.now()}',}
    ];

    setState(() {
      transaction.add(NewList);
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Test Speeeed',home: Scaffold(
        appBar: AppBar(
          title: Text('Home'),),body: Container(
          margin: EdgeInsets.all(20),child: Column(
            mainAxisAlignment: MainAxisAlignment.start,children: [
              PassData(SubmitData),...(transaction).map((e) {
                return Card(
                    margin: EdgeInsets.fromLTRB(0,10,10),elevation: 3,child: Row(
                      children: [
                        Container(
                            padding: EdgeInsets.all(3),margin: EdgeInsets.all(20),decoration: BoxDecoration(
                              borderRadius: BorderRadius.circular(10),color: Colors.blue,child: Text(
                              '\$${e['amount']}',style:
                                  TextStyle(fontSize: 15,color: Colors.white),)),Column(
                          children: [
                            Container(
                                margin: EdgeInsets.fromLTRB(0,child: Text(
                                  e['title'],style: TextStyle(fontWeight: FontWeight.bold),Text(
                              '${DateFormat.MMMMd().format(e['date'])}',style: TextStyle(color: Colors.black38),],));
              })
            ],);
  }
}

PassAddFun 文件：

import 'package:flutter/material.dart';
import 'package:intl/intl.dart';

class PassData extends StatefulWidget {
  final Function Adx;

  PassData(this.Adx);

  @override
  _PassDataState createState() => _PassDataState();
}

class _PassDataState extends State<PassData> {
  final titleController = TextEditingController();

  final amountController = TextEditingController();

  void sumbitdata() {
    widget.Adx(titleController.text,double.parse(amountController.text));
  }

  @override
  Widget build(BuildContext build) {
    return Column(
      children: [
        Container(
            padding: EdgeInsets.fromLTRB(0,30),child: TextField(
              decoration: InputDecoration(labelText: 'Title'),controller: titleController,Container(
          child: TextField(
              decoration: InputDecoration(labelText: 'Amount'),controller: amountController),Container(
            margin: EdgeInsets.fromLTRB(0,40),child: FlatButton(
              onPressed: () {
                sumbitdata();
              },child: Text(
                'Add Transaction',style: TextStyle(color: Colors.white),);
  }
}

我想在按下指定的按钮后向数据添加一个条目，但没有按照我想要的方式完成？为什么这是由于 List 的类型？或者我应该在代码中更改什么和什么

解决方法

您正在将一个列表添加到另一个列表中。 为此，您应该使用 .addAll 而不是 .add

setState(() {
      transaction.addAll(NewList);
    });