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[英]The method 'showSnackBar' isn't defined for the type 'ScaffoldState'
[英]Error: The method 'showSnackBar' isn't defined for the class 'ScaffoldState'
`lib/auth/login.dart:49:40: 錯誤:未為 class 'ScaffoldState' 定義方法 'showSnackBar'。
if (response.statusCode == 401) { setState(() => isLoading = false); return _scaffoldKey.currentState.showSnackBar(SnackBar( content: Row( mainAxisAlignment: MainAxisAlignment.spaceBetween, children: [ Container(child: Icon(Icons.error)), Text('Invalid username or password'), ], ), action: SnackBarAction( label: 'UNDO', onPressed: () {}, ), )); } }
要顯示SnackBar
,請從小部件樹(更准確地說是元素樹)的祖先查找ScaffoldMessenger
。 例如:
ScaffoldMessenger.of(context).showSnackBar(snackBar);
您可以從官方文檔中閱讀更多相關信息和示例代碼: https://docs.flutter.dev/cookbook/design/snackbars
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