断言失败:行4109位置12:'_lifecycleState！= _ElementLifecycle.defunct':不正确

问题描述

我收到一个错误，提示_lifecycleState！= _ElementLifecycle.defunct':不正确.

我不确定为什么会引发错误，但是我的代码在这里

  class MyprofilTile扩展了StatefulWidget {最终的TextEditingController搜索输入；const MyprofilTile({Key key，this.searchinginput}):super(key:key);@override_MyprofilTileState createState()=>_MyprofilTileState();}类_MyprofilTileState扩展了State< MyprofilTile>{列出_allResults = [];清单_resultsList = [];未来结果已加载；_onsearchChanged(){此lineeeeeeeeeeeeeeeeeeeeeeeeeee搜索结果();//print(args.searchcontroller);}搜索结果(){var showResults = [];if(widget.searchinginput.text！=")){for(_allResults中的var tripsnapshot){var title = DatbaseService.instance.userDataFromSnapshot(tripsnapshot).username.toLowerCase();if(title.contains(widget.searchinginput.text.toLowerCase())){showResults.add(tripsnapshot);}}}别的{showResults = List.from(_allResults);}setState((){.其this lineeeeeeeeeeeeeeeeeee_resultsList = showResults;});}@override无效的initState(){super.initState();widget.searchinginput.addListener(_onsearchChanged);和此lineeeeeeeeeeeee}@override无效dispose(){widget.searchinginput.removeListener(_onsearchChanged());widget.searchinginput.dispose();super.dispose();}@overridevoid didChangeDependencies(){super.didChangeDependencies();resultsLoaded = getusers();}getusers()异步{var firestore = FirebaseFirestore.instance;QuerySnapshot qn =等待firestore.collection('meinprofilsettings').get();setState((){_allResults = qn.docs;});搜索结果();返回完成"；} 

这是错误

我正在使用此statefulwidget内文本字段中的controller值.如果您需要更多信息，请发表评论

解决方案

我不确定您要在这里实现什么，但是无法神奇地"在另一个小部件中访问一个小部件中的变量./p>

这里的错误是您试图调用从未初始化的 args 上的 searchcontroller .请记住，创建一个作为Widget的变量是行不通的，并且您不必这样做.

Im getting an error that says _lifecycleState != _ElementLifecycle.defunct': is not true.

im not sure why the error throws but heres my code

class MyprofilTile extends StatefulWidget {
   final  TextEditingController searchinginput;


 const MyprofilTile ({ Key key, this.searchinginput }): super(key: key);


  @override
  _MyprofilTileState createState() => _MyprofilTileState();
}

class _MyprofilTileState extends State<MyprofilTile> {
  
    List _allResults=[];
    List _resultsList=[];
    Future resultsLoaded;

_onsearchChanged(){this lineeeeeeeeeeeeeeeeeeeeeeeee
  searchResults();
 // print(args.searchcontroller);
} 

searchResults(){
  var showResults=[];
  if(widget.searchinginput.text!=""){
    for(var tripsnapshot in _allResults){
      var title = DatbaseService.instance.userDataFromSnapshot(tripsnapshot).username.toLowerCase();
      if(title.contains(widget.searchinginput.text.toLowerCase())){
        showResults.add(tripsnapshot);
     }

    }

  }
  else{
    showResults=List.from(_allResults);
  }
  setState(() {.  its this lineeeeeeeeeeeeeeeee
    _resultsList = showResults;
  });

}

  @override  
  void initState(){
    super.initState();
    widget.searchinginput.addListener(_onsearchChanged);and this lineeeeeeeeeeeee
  }
  @override
  void dispose(){
   widget.searchinginput.removeListener(_onsearchChanged());
    widget.searchinginput.dispose();
    super.dispose();
  }
@override
 void didChangeDependencies(){
    super.didChangeDependencies();
    resultsLoaded = getusers();

  }


   getusers() async {
    var firestore = FirebaseFirestore.instance;
    QuerySnapshot qn = await firestore.collection('meinprofilsettings').get();
    setState(() {
      _allResults =qn.docs;
    });
    searchResults();
    return "Complete";
  }

This is the error

Im using the value of controller from a textfield inside this statefulwidget .If you need more information please leave a comment

解决方案

I'm not sure what you're trying to achieve here, but a variable in a widget can't be accessed in another widget 'magically'.

Your error here is that you're trying to call searchcontroller on args which was never initialised. Keep in mind that creating a variable which is a Widget won't work, and you shouldn't have to do it.

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