我称我的有状态小部件为“页面”,并从服务器获取一些信息。如果没有找到任何信息,它会警告用户没有任何信息。 从抽屉返回按钮,我回到上一页。如果我快速来回地重复操作,我的IntelliJ IDE控制台会显示错误消息:
E/flutter (22681): [ERROR:flutter/shell/common/shell.cc(181)] Dart Error: Unhandled exception:
E/flutter (22681): setState() called after dispose(): _BillsPayWaterState#66be5(lifecycle state: defunct, not mounted)
E/flutter (22681): This error happens if you call setState() on a State object for a widget that no longer appears in the widget tree (e.g., whose parent widget no longer includes the widget in its build). This error can occur when code calls setState() from a timer or an animation callback. The preferred solution is to cancel the timer or stop listening to the animation in the dispose of the () callback. Another solution is to check the "mounted" property of this object before calling setState() to ensure the object is still in the tree.
E/flutter (22681): This error might indicate a memory leak if setState() is being called because another object is retaining a reference to this State object after it has been removed from the tree. To avoid memory leaks, consider breaking the reference to this object during dispose of ().
E/flutter (22681): #0 State.setState.<anonymous closure>
在我的有状态小部件中,我有@override void initState()
和@override void dispose()
。
我的问题是,当我使用抽屉式导航栏的返回按钮时,如何完全销毁我的有状态小部件?
这是小部件的调用
onTap: () {
Navigator.push(
context,
SlideRightRoute(widget: new BillsWaterPay(“S02")),
);
}
这是 BillsWaterPay 小部件
List<List<dynamic>> _userAskBills;
// TODO: KURUM KODU - SABIT TELEFON
String _kurumKodu = "";
String _noDataText = "";
class BillsWaterPay extends StatefulWidget {
final String title;
BillsWaterPay(this.title);
@override
_BillsWaterPayState createState() =>
_BillsWaterPayState();
}
class _BillsWaterPayState extends State<BillsWaterPay> {
@override
void initState() {
// TODO: implement initState
super.initState();
_kurumKodu = widget.title;
_userAskBills;
_noDataText;
_loadEverything();
}
Future _loadEverything() async {
await _getDataFromServer();
}
Future _getDataFromServer() async() {
…
…
if no data
setState
_noDataText = “No Data”; // In here I get an error setState called after dispose
}
@override
void dispose() {
super.dispose();
_kurumKodu = widget.title;
_userAskBills;
_noDataText;
}