小编Teg*_*007的帖子

我试图在注销按钮的 onPressed 方法之后调用 _signOut 函数。但是它没有（识别函数或让我调用它）但是我可以进行调用 widget.Onsignedout，对它的父级回调，一切都按预期工作。除了我在 auth.signout 上注销用户并回电只是为了更新表单。如何从状态类访问 _signOut()？谢谢你

import 'package:flutter/material.dart';
import 'package:login_demo/auth.dart';
import 'package:login_demo/root_page.dart';

class HomePage extends StatefulWidget {
  HomePage({this.auth, this.onSignedOut});
  final BaseAuth auth;
  //To call a function of a parent, you can use the callback pattern
  final VoidCallback onSignedOut;

  void _signOut() async {
    try {
      Text('Signing Out here');
      await auth.signOut();
      onSignedOut;
    } catch (e) {
      print(e);
    }
  }

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

class _HomePageState extends State<HomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar( …