Flutter 图表：添加库不会让我在应用程序中更改颜色。我能做些什么？

Question

在我的 flutter 应用程序中，我想实现一些图表，所以我添加了以下库：导入 'package:charts_flutter/flutter.dart';

但是我一实现，就出现了很多问题，例如：我不能在我的 Appbar 中使用随机颜色，我真的不知道为什么会这样。这是我的一段代码：

import 'package:flutter/material.dart';
import 'package:firebase_core/firebase_core.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:charts_flutter/flutter.dart';

class ZulassungenScreen extends StatefulWidget {
  @override
  _ZulassungenScreen createState() => _ZulassungenScreen();
}

@override
class _ZulassungenScreen extends State<ZulassungenScreen> {
  @override
  Widget build(BuildContext context) {
    return DefaultTabController(
      length: 4,
      child: Scaffold(
        appBar: AppBar(
          title: Text('This page'),
          flexibleSpace: Container(
            decoration: BoxDecoration(
              gradient: LinearGradient(
                  colors: [Color(0xffFBD23E), Color(0xffF6BE03)],
                  begin: Alignment.topCenter,
                  end: Alignment.bottomCenter),
            ),
          ),
          bottom: TabBar(
            isScrollable: true,
            unselectedLabelColor: Colors.black,
            unselectedLabelStyle: TextStyle(fontWeight: FontWeight.normal),
            indicatorSize: TabBarIndicatorSize.label,```
and so on...```


It appears an error here: "colors: [Color(0xffFBD23E), Color(0xffF6BE03)],""

Can you please help me? Thank you so much!!

Answer 1

我想我明白了！您只需在库的末尾添加 as charts;。

-> 就像这样：将 'package:charts_flutter/flutter.dart' 作为图表导入；

-> 而不是这个：导入 'package:charts_flutter/flutter.dart';

Answer 2

问题是 charts_flutter 实现了自定义颜色 class。

可以通过在导入库时添加前缀来解决：

import 'package:charts_flutter/flutter.dart' as charts;

Flutter 图表：添加库不会让我在应用程序中更改颜色。我能做些什么？

Flutter Charts: Adding Library won't let me change colors in the App. What can I do?

charts

ios

dart

flutter