我正在尝试使搜索按钮按下后创建一个列表项。它可以工作,但是为了让它出现,我必须单击按钮,然后重新构建应用程序。我查看了一些其他帖子,但是找不到任何有效的解决方案。需要注意的主要部分是我有一个添加列表项的函数。我有一个带有on press的按钮来创建该列表项。并且我在底部的容器的子元素中拥有已创建的列表项列表。
class Home extends StatefulWidget {
const Home({Key? key}) : super(key: key);
@override
State<Home> createState() => _HomeState();
}
class _HomeState extends State<Home> {
List<Widget> _listOfWidgets = [];
@override
Widget build(BuildContext context) {
_addItemToList() {
List<Widget> tempList =
_listOfWidgets; // defining a new temporary list which will be equal to our other list
tempList.add(ListTile(
key: UniqueKey(),
leading: Icon(Icons.list),
trailing: FlatButton(
onPressed: () async {},
//Download Link
child: Text(
"Download",
style: TextStyle(color: Colors.green, fontSize: 15),
),
),
title: Text("")));
this.setState(() {
_listOfWidgets =
tempList; // this will trigger a rebuild of the ENTIRE widget, therefore adding our new item to the list!
});
}
return MaterialApp(
theme: ThemeData.light(),
darkTheme: ThemeData.dark(),
themeMode: currentTheme.currentTheme(),
home: Scaffold(
appBar: AppBar(
actions: [
IconButton(
onPressed: () {
setState(() {
currentTheme.switchTheme();
});
},
icon: Icon(Icons.wb_sunny),
),
IconButton(
onPressed: () async {
await FirebaseAuth.instance.signOut();
},
icon: Icon(Icons.exit_to_app),
),
],
backgroundColor: Colors.blue,
title: Text("Home"),
),
body: ListView(
children: [
ListTile(
leading: SizedBox(
width: 300,
child: TextField(
controller: search,
decoration: InputDecoration(
labelText: "Enter Manga Name",
),
),
),
trailing: ElevatedButton(
onPressed: () async {
_addItemToList();
},
child: Text("Search")),
),
Container(
margin: EdgeInsets.all(15),
width: 100,
height: 515,
color: Colors.black12,
child: ListView(
children: _listOfWidgets,
))
],
)));
}
}
_addItemToList()
方法从build
方法中移出,它应该是类作用域方法。 - ישו אוהב אותך