我正在尝试在 Cupertino 应用程序中使用 ChoiceChip
小部件。
我找到了这个解决方案https://github.com/flutter/flutter/issues/21872#issuecomment-421508939在 GitHub 上
CupertinoApp(
localizationsDelegates: const <LocalizationsDelegate<dynamic>>[
DefaultMaterialLocalizations.delegate,
DefaultWidgetsLocalizations.delegate,
],
title: 'Flutter Demo',
home: new MyHomePage(title: 'Flutter Demo Home Page'),
)
这是我的代码
return CupertinoApp(
localizationsDelegates: const <LocalizationsDelegate<dynamic>>[
DefaultWidgetsLocalizations.delegate,
],
home: CupertinoStoreHomePage(),
);
_buildChoiceList() {
List<Widget> choices = List();
widget.reportList.forEach((item) {
choices.add(Container(
child: ChoiceChip(
label: Text(item),
selected: selectedChoice == item,
onSelected: (selected) {
setState(() {
selectedChoice = item;
widget.onChoiceSelected(item);
});
},
),
));
});
return choices;
}
我收到此错误
════════小组件库捕获异常═════════════════════════════ ═════ ═ 构建 ChoiceChip(dirty) 时抛出以下断言: 找不到 Material 小部件。
ChoiceChip 小部件需要 Material 小部件祖先。
最佳答案
您可以使用Material
包裹Column
完整的工作代码和演示请参见下面
代码片段
@override
Widget build(BuildContext context) {
return Material(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: _buildChoiceList(),
));
}
完整代码
import 'package:flutter/material.dart';
import 'package:flutter/cupertino.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return CupertinoApp(
localizationsDelegates: const <LocalizationsDelegate<dynamic>>[
DefaultMaterialLocalizations.delegate,
DefaultWidgetsLocalizations.delegate,
],
home: CupertinoStoreHomePage(
reportList: ["a", "b"],
onChoiceSelected: (item) {
print(item);
},
),
);
}
}
class CupertinoStoreHomePage extends StatefulWidget {
List<String> reportList;
Function(String) onChoiceSelected;
CupertinoStoreHomePage({Key key, this.reportList, this.onChoiceSelected})
: super(key: key);
@override
_CupertinoStoreHomePageState createState() => _CupertinoStoreHomePageState();
}
class _CupertinoStoreHomePageState extends State<CupertinoStoreHomePage> {
String selectedChoice;
@override
Widget build(BuildContext context) {
return Material(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: _buildChoiceList(),
));
}
_buildChoiceList() {
List<Widget> choices = [];
widget.reportList.forEach((item) {
choices.add(Container(
child: ChoiceChip(
label: Text(item),
selected: selectedChoice == item,
onSelected: (selected) {
setState(() {
selectedChoice = item;
widget.onChoiceSelected(item);
});
},
),
));
});
return choices;
}
}
输出
I/flutter (10201): a
I/flutter (10201): b
关于flutter - 将 Choicechip 小部件与 Cupertino 应用程序一起使用,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/58566968/