use ref.watch() to get the value of the provider final helloWorld = ref.watch(helloWorldProvider); return Text(helloWorld); } } By subclassing from ConsumerStatefulWidget and ConsumerState, we can call ref.watc
尝试给它一个初始化表达式,或者确保在每个执行路径上分配它类TodoCardPage扩展StatefulWidget { const TodoCardPage({ Key键,必需的this.title,必需的this.iconData,要求的this.iconColor,}):超级(键:键) 浏览9提问于2022-02-19得票数 1 回答已采纳
If you need to embed another StatefulWidget in a StatefulWidget, you can call the constructor of another StatefulWidget in its corresponding State, and pass the data to be passed to the child Widget in the form of constructor parameters. Of course it is fine to do so. But if there are too...
import 'package:flutter/cupertino.dart'; import 'package:window_manager_plus/window_manager_plus.dart'; class HomePage extends StatefulWidget { @override _HomePageState createState() => _HomePageState(); } class _HomePageState extends State<HomePage> with WindowListener { @override void initState()...
class KeyboardDetector extends StatefulWidget { KeyboardShowCallback keyboardShowCallback; Widget content; KeyboardDetector({this.keyboardShowCallback, @required this.content}); @override _KeyboardDetectorState createState() => _KeyboardDetectorState(); ...
// or simply save your changes to "hot reload" in a Flutter IDE).// Notice that the counter didn't reset back to zero; the application // is not restarted. primarySwatch: Colors.blue, ), home: MyHomePage(), ); } } class MyHomePage extends StatefulWidget { ...
StatefulWidget is one of the most basic ways of saving state, allowing the UI to change without rebuilding the widget. The RecipeList widget, for example, saves several fields for later usage, including the current search list and the start and end positions of search results for pagination....
现在，我必须在第二个小部件中访问在第一个小部件中创建的对象的实例，但我不太确定在创建小部件时...
User is unable to input. See Video Here Code sample Code sample `import 'package:flutter/material.dart'; import 'package:flutter_svg/flutter_svg.dart'; class Authsample extends StatefulWidget { const Authsample({Key? key}) : super(key: key); @override State<Authsample> createState() =...
Now, openmain.dartin your code editor and replace the following lines of code to importdart:asyncand use aStatefulWidget: lib/main.dart import 'package:flutter/material.dart';import 'dart:async';void main() { runApp(MyApp()); } class MyApp extends StatelessWidget { ...