我在我的应用程序中使用 Flutter SearchDelegate，代码如下：
class NameSearch extends SearchDelegate<String> {
@override
List<Widget> buildActions(BuildContext context) {
return [
IconButton(
icon: Icon(Icons.clear),
onPressed: () {
query = "";
},
)
];
}
@override
Widget buildLeading(BuildContext context) {
return IconButton(
icon: AnimatedIcon(
icon: AnimatedIcons.menu_arrow, progress: transitionAnimation),
onPressed: () {
close(context, null);
},
);
}
@override
Widget buildResults(BuildContext context) {
return null;
}
@override
Widget buildSuggestions(BuildContext context) {
suggestionList = query.isEmpty ? [] : List.generate(nameList.length,
(i) => nameList[i]).where((p) => p.name.startsWith(query)).toList();
return ListView.builder(
itemBuilder: (context, index) => ListTile(
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => DetailScreen(
detail: suggestionList[index],
)));
},
leading: Icon(Icons.book),
title: RichText(
text: TextSpan(
text: suggestionList[index].name.substring(0, query.length),
style: TextStyle(
color: Colors.black, fontWeight: FontWeight.bold),
children: [
TextSpan(
text: suggestionList[index].name.substring(query.length),
style: TextStyle(color: Colors.grey))
]),
),
),
itemCount: suggestionList.length,
);
}
}
当我单击建议列表中的某个项目时，它会将我带到新的详细信息屏幕并正常工作。但是当我想回到搜索屏幕时，文本输入变成这样：
而且我不能再插入任何文本，直到重新启动应用程序或转到另一个页面，然后再次返回搜索页面！
这是我的 DetailScreen 代码：
class DetailScreen extends StatelessWidget {
final BookDetail detail;
DetailScreen({Key key, @required this.detail}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(detail.name),
),
body: Padding(
padding: EdgeInsets.all(16.0),
child: Text(detail.description),
),
);
}
}