查找停用的小部件的祖先是不安全的 [英] Looking up a deactivated widget's ancestor is unsafe

问题描述

我是Flutter的新手，正在尝试通过Dialog接收数据. 当单击textField时，出现image2错误...

I am new in Flutter and I am trying receive data with a Dialog. When a click in textField the error of image2 appear...

show(BuildContext context){

    var dialog = Dialog(
      child: Container(
        margin: EdgeInsets.all(8.0),
        child: Form(
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: <Widget>[
              TextFormField(
                decoration: InputDecoration(
                    labelText: "Insira o número de telefone",
                    border: OutlineInputBorder(
                        borderRadius: BorderRadius.all(Radius.circular(2.0)))),
              ),
              Row(
                mainAxisAlignment: MainAxisAlignment.end,
                children: <Widget>[
                  FlatButton(
                      onPressed: () {
                        Navigator.of(context).pop();
                      },
                      child: Text("Cancelar")),
                  FlatButton(
                      onPressed: () {
                        Navigator.of(context).pop();
                      },
                      child: Text("Aceitar"))
                ],
              )
            ],
          ),
        ),
      ),
    );

    showDialog(context: context,builder: (context){
      return dialog;
    });
  }

这是我的代码.

I/flutter (31032): Looking up a deactivated widget's ancestor is unsafe.
I/flutter (31032): At this point the state of the widget's element tree is no longer stable. To safely refer to a
I/flutter (31032): widget's ancestor in its dispose() method, save a reference to the ancestor by calling
I/flutter (31032): inheritFromWidgetOfExactType() in the widget's didChangeDependencies() method.
I/flutter (31032): 

推荐答案

尝试一下

为对话框提供不同的上下文名称

Give different context name for dialog

 showDialog(context: context,builder: (dialogContex){
              return Dialog(
                child: Container(
                  margin: EdgeInsets.all(8.0),
                  child: Form(
                    child: Column(
                      mainAxisSize: MainAxisSize.min,
                      children: <Widget>[
                        TextFormField(
                          decoration: InputDecoration(
                              labelText: "Insira o número de telefone",
                              border: OutlineInputBorder(
                                  borderRadius: BorderRadius.all(Radius.circular(2.0)))),
                        ),
                        Row(
                          mainAxisAlignment: MainAxisAlignment.end,
                          children: <Widget>[
                            FlatButton(
                                onPressed: () {
                                  Navigator.of(dialogContex).pop();
                                },
                                child: Text("Cancelar")),
                            FlatButton(
                                onPressed: () {
                                  Navigator.of(context).pop();
                                },
                                child: Text("Aceitar"))
                          ],
                        )
                      ],
                    ),
                  ),
                ),
              );
            });

这篇关于查找停用的小部件的祖先是不安全的的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！