Question

我是新手，今天我正在测试诸如更改文本和功能之类的东西。但是现在我有一个问题，如何更改所有文本的颜色？我已经将背景更改为黑色，但是无法更改颜色字体并且不想在每个Text（）中进行更改。

这是我现在的代码：

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'El Grandioso Countador e Parificador',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(title: 'El Grandioso Countador e Parificador'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;
  var _color = Colors.white;
  String _pi = "0 não é par nem ímpar";

  void _incrementCounter() {
    setState(() {
      _pi = _counter % 2 == 0 ? "par" : "ímpar";
      _color = _pi == "par" ? Colors.blue : Colors.red;
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.black, //Here I'm changing the entire background to black, but the text are black too, so I can't read anything on my app.
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'Nusha, sabe quantas vezes tu clicou no botão lá? Olha ae:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
            Text(
              _pi == '0 não é par nem ímpar'
                  ? '$_pi'
                  : 'Rapash, teu número é $_pi',
              style: TextStyle(color: _color),
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Clicador',
        child: Icon(Icons.add),
      ),
    );
  }
}

我已经搜索过，但没有任何东西可以解决我的问题。有人有提示吗？

Answer 1

ThemeData类具有您可以设置的textTheme属性。

尝试一下：

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'El Grandioso Countador e Parificador',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
        textTheme: TextTheme(headline4: TextStyle(color: Colors.purple)),
      ),
      home: MyHomePage(title: 'El Grandioso Countador e Parificador'),
    );
  }
}

Answer 2

您可以在TextTheme.apply中使用textTheme并为bodyColor和displayColor设置颜色，如下代码：

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'El Grandioso Countador e Parificador',
      theme: ThemeData(
          primarySwatch: Colors.blue,
          visualDensity: VisualDensity.adaptivePlatformDensity,
          textTheme: Theme.of(context).textTheme.apply(
                bodyColor: Colors.red,
                displayColor: Colors.red,
              )),
      home: MyHomePage(title: 'El Grandioso Countador e Parificador'),
    );
  }
}

如何在颤动时更改所有文本的颜色？

2 个答案: