text编辑另一个类的控制器

Question

我是个新手，有人能帮我吗？请

我希望一旦我点击RawMaterialButton((，我在TextField((中写的内容就会在container((类中显示为文本。

void main() => runApp(mainApp());
class mainApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: chat(),
);
}
}
class chat extends StatefulWidget {
const chat({Key? key}) : super(key: key);
@override
_chatState createState() => _chatState();
}
class _chatState extends State<chat> {
bool changeClass = false;
changeClassValue() {
setState(() {
changeClass = !changeClass;
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: changeClass
? container(
text: _textFieldState().textController.text,
)
: textField(
changeClassValue: changeClassValue,
),
);
}
}
class textField extends StatefulWidget {
textField({Key? key, required this.changeClassValue}) : super(key: key);
Function changeClassValue;
@override
_textFieldState createState() => _textFieldState();
}
class _textFieldState extends State<textField> {
final textController = TextEditingController();
@override
Widget build(BuildContext context) {
return Center(
child: Row(
children: [
Container(
width: 300.0,
height: 60.0,
color: Colors.red,
child: TextField(
controller: textController,
),
),
RawMaterialButton(
onPressed: () {
setState(() {
widget.changeClassValue();
print(textController.text);
});
},
child: Icon(Icons.send),
)
],
),
);
}
}
class container extends StatefulWidget {
container({Key? key, required this.text}) : super(key: key);
String text;
@override
_containerState createState() => _containerState();
}
class _containerState extends State<container> {
@override
Widget build(BuildContext context) {
return Center(
child: Container(
width: double.infinity,
height: 60.0,
color: Colors.grey,
child: Text(widget.text),
),
);
}
}

希望有人能帮助我。

谢谢：(我写这篇文章是因为否则它不允许我上传

Answer 1

您需要将changeClassValue的类型更新为ValueChanged<String>，现在您可以在textField和chat状态之间传递数据。

import 'dart:math';
import 'package:flutter/material.dart';
void main() => runApp(mainApp());
class mainApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: chat(),
);
}
}
class chat extends StatefulWidget {
const chat({Key? key}) : super(key: key);
@override
_chatState createState() => _chatState();
}
class _chatState extends State<chat> {
bool changeClass = false;
String? text;
changeClassValue(String? newText) {
setState(() {
changeClass = !changeClass;
text = newText;
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: changeClass
? container(
text: text ?? "",
)
: textField(
changeClassValue: changeClassValue,
),
);
}
}
class textField extends StatefulWidget {
textField({Key? key, required this.changeClassValue}) : super(key: key);
ValueChanged<String> changeClassValue;
@override
_textFieldState createState() => _textFieldState();
}
class _textFieldState extends State<textField> {
final textController = TextEditingController();
@override
Widget build(BuildContext context) {
return Center(
child: Row(
children: [
Container(
width: 300.0,
height: 60.0,
color: Colors.red,
child: TextField(
controller: textController,
),
),
RawMaterialButton(
onPressed: () {
widget.changeClassValue(textController.text);
},
child: Icon(Icons.send),
)
],
),
);
}
}
class container extends StatefulWidget {
container({Key? key, required this.text}) : super(key: key);
String text;
@override
_containerState createState() => _containerState();
}
class _containerState extends State<container> {
@override
Widget build(BuildContext context) {
return Center(
child: Container(
width: double.infinity,
height: 60.0,
color: Colors.grey,
child: Text(widget.text),
),
);
}
}