我是Flutter的新手。我正在创建一个基本的颤振应用程序。这是我的密码:
class MyApp extends StatelessWidget {
const MyApp({super.key});
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Row(
mainAxi
我看到这个例子是为了获取一个小部件的大小/位置:
我的密码怎么了?
我知道错误:
The following NoSuchMethodError was thrown while handling a gesture:
I/flutter ( 8566): The method 'findRenderObject' was called on null.
I/flutter ( 8566): Receiver: null
I/flutter ( 8566): Tried calling: findRenderObject()
void main() {
runApp