[英]Text inside ElevatedButton doesn't change | Flutter
i have simple question.我有一个简单的问题。 Why color of my Text inside the ElevatedButton is not changing when i click the button?
为什么当我单击按钮时, ElevatedButton内的文本颜色没有改变?
I tried to do it on 2 ways:我试图通过两种方式做到这一点:
By adding variable _firColor
in color:
inside TextStyle
as parameter.通过在
color:
中添加变量_firColor
: TextStyle
作为参数。
By adding variable _firColor
in foregroundColor:
inside ElevatedButton.styleFrom
as parameter.通过在
ElevatedButton.styleFrom
内的foregroundColor:
中添加变量_firColor
作为参数。
None of them works.它们都不起作用。
Printing _firColor always has same result.打印_firColor总是有相同的结果。 It prints 2 lines after one click.
一键打印2行。
It behave like after changing value of _firColor it always leads to change it's value to his core value.它的行为就像在更改_firColor的值之后总是会导致将其值更改为他的核心值。
** CODE:** ** 代码:**
import 'package:flutter/material.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) => const MaterialApp(
home: MyHomePage(),
);
}
class MyHomePage extends StatefulWidget {
const MyHomePage({Key? key}) : super(key: key);
@override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
@override
Widget build(BuildContext context) {
Color _firColor = const Color.fromARGB(199, 84, 84, 84);
return Scaffold(
backgroundColor: const Color.fromARGB(198, 188, 112, 112),
body: Center(
child: ElevatedButton(
child: Text(
"login",
style: TextStyle(fontSize: 40, color: _firColor),
),
style: ElevatedButton.styleFrom(
foregroundColor: _firColor,
backgroundColor: Colors.white,
),
onPressed: () {
setState(() {
print(_firColor);
_firColor = Colors.black;
print(_firColor);
});})));}}
class _MyHomePageState extends State<MyHomePage> {
Color _firColor = const Color.fromARGB(199, 84, 84, 84);
@override
Widget build(BuildContext context) {
return Scaffold(
........
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