flutter - 如何临时更改 Flutter 小部件中的文本颜色(和变回)？

Question

我正在寻找一种解决方案，将文本小部件中的文本颜色暂时更改为红色 3 秒。我目前可以将它设置为红色，但如何在这段时间后将其更改回原样？

Answer 1

像这样...

import 'dart:async';
void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: SO(),
    );
  }
}
class SO extends StatefulWidget {
  @override
  _SOState createState() => _SOState();
}

class _SOState extends State<SO> {
  static final orgColor = Colors.black;
  var currentColor  = orgColor;
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: Center(child: Text("this is colored",style: TextStyle(color: currentColor,fontSize: 40),)),
      floatingActionButton: FloatingActionButton(onPressed: () {
        setState(() {
          currentColor = Colors.red;
        });
        Timer(Duration(seconds: 3),(){
          setState(() {
            currentColor = orgColor;
          });
        });
      },),
    );
  }
}
import 'dart:async';
void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: SO(),
    );
  }
}
class SO extends StatefulWidget {
  @override
  _SOState createState() => _SOState();
}

class _SOState extends State<SO> {
  static final orgColor = Colors.red;
  var currentColor  = orgColor;
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: Center(child: Text("this is colored",style: TextStyle(color: currentColor,fontSize: 40),)),
      floatingActionButton: FloatingActionButton(onPressed: () {
        setState(() {
          currentColor = Colors.blue;
        });
        Timer(Duration(seconds: 2),(){
          setState(() {
            currentColor = orgColor;
          });
        });
      },),
    );
  }
}

---

基本上设置一个定时器等待一段时间(这里是2秒)然后重置状态。