firebase - 在 Flutter 中关闭 AlertDialog

Question

我有一个简单的 Flutter 应用程序，其中包含从 Firebase 数据库 (Cloud Firestore) 加载的项目列表。

如您所见 - 有用于添加项目的按钮，每个项目都可以删除或编辑。当我按下所选项目的编辑按钮时，会出现带有 TextField 的 AlertDialog，在此 TextField 中，用户可以看到当前项目名称并对其进行编辑。 我只有在编辑后关闭对话框时遇到问题。

   new IconButton(
      icon: new Icon(Icons.edit, color: Colors.white),
      onPressed: (){ showItemUpdateDialog(context, document); }
   )
   .......


void showItemUpdateDialog(BuildContext context, DocumentSnapshot item) {

  String itemName = "";
  var textContoller = new TextEditingController();
  textContoller.text = item['name'];

  var dialog = new AlertDialog(
    title: new Text("item name"),
    content: new TextField(
      controller: textContoller,
      onChanged: (value) {newName = value;},
    ),
    actions: <Widget>[
      new FlatButton(
        child: Text("cancel"),
        onPressed: (){
          Navigator.pop(context);
        },
      ),
      new FlatButton(
          child: Text("Update"),
          onPressed: () { 
            updateItemOnServer(item, newName); 
            Navigator.pop(context); 
          }
      )
    ],
  );

  showDialog(context: context, child: dialog);
}

值正在正确更新，但没有关闭 AlertDialog。错误代码如下。我认为这是因为它是由从服务器修改和更新的项目调用的。

flutter: The following assertion was thrown while handling a gesture: flutter: Looking up a deactivated widget's ancestor is unsafe. flutter: At this point the state of the widget's element tree is no longer stable. To safely refer to a flutter: widget's ancestor in its dispose() method, save a reference to the ancestor by calling flutter: inheritFromWidgetOfExactType() in the widget's didChangeDependencies() method.

Answer 1

试试这个，

 Navigator.of(context, rootNavigator: true).pop(),