Index
以下のようなCupertinoTavScaffoldでタブ切り替えをしたときに表題のエラーが発生しました。
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@override Widget build(BuildContext context) { return CupertinoTabScaffold( tabBar: CupertinoTabBar( currentIndex: _selectedIndex, onTap: (index) => setState( () { _selectedIndex = index; }, ), items: <BottomNavigationBarItem>[ BottomNavigationBarItem( icon: const Icon(CupertinoIcons.home), label: homeName, ), BottomNavigationBarItem( icon: const Icon(CupertinoIcons.book), label: diaryName, ), BottomNavigationBarItem( icon: const Icon(CupertinoIcons.settings), label: settingName, ), ], ), tabBuilder: (BuildContext context, int index) { return CupertinoTabView( builder: (BuildContext context) { return _widgetList[_selectedIndex]; }, ); }, ); } |
切り替えたときに表示されるwidgetは以下の通り
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class _SettingViewState extends State<SettingView> { @override Widget build(BuildContext context) { return TextFormField( decoration: const InputDecoration( icon: Icon(Icons.person), hintText: 'What do people call you?', labelText: 'Name *', ), onSaved: (String? value) { // This optional block of code can be used to run // code when the user saves the form. }, validator: (String? value) { return (value != null && value.contains('@')) ? 'Do not use the @ char.' : null; }, ); } } |
Materialで囲ってあげれば良い！
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@override Widget build(BuildContext context) { //Materialで囲ってあげれば良い return Material( child: TextFormField( decoration: const InputDecoration( icon: Icon(Icons.person), hintText: 'What do people call you?', labelText: 'Name *', ), onSaved: (String? value) { // This optional block of code can be used to run // code when the user saves the form. }, validator: (String? value) { return (value != null && value.contains('@')) ? 'Do not use the @ char.' : null; }, ), ); } |
https://github.com/flutter/flutter/issues/28326
