我正在创建有状态的 Flutter 类，如下所示：
class Buildings extends StatefulWidget {
const Buildings(this._auth, {Key key, this.title}) : super(key: key);
final FirebaseAuth _auth;
final String title;
@override
_BuildingsState createState() => _BuildingsState();
}
class _BuildingsState extends State<Buildings> {
//////
}
Even though I am following constructor and Create State Method, I am now able to see widget object in **_BuildingsState** class. I cannot access **widget** variable. then forward In would like to get widget._auth.
How can I get widget variable. Currely I am getting :
Error: Getter not found: 'widget
Code Where I am trying to access widget:
Navigator.of(context).push(new MaterialPageRoute(
builder: (BuildContext context) =>
Rooms(widget._auth, widget.existingBuilding)));
Navigator.of(context).push(route);
添加完整文件以供参考：（基本上无法在子组件中获取小部件。我也没有通过incomingWidget 对象获取小部件。例如，我没有获得incomingWidget._auth 或 widget._auth，我的意思是任何方式）
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';
import 'package:flutter_login_page/AddBuilding.dart';
import 'package:flutter_login_page/Building.dart';
import 'package:flutter_login_page/EditBuilding.dart';
import 'package:flutter_login_page/EditRoom.dart';
import 'package:flutter_login_page/Home2.dart';
import 'package:flutter_login_page/Rooms.dart';
class Buildings extends StatefulWidget {
const Buildings(this._auth, this.existingBuilding, {Key key, this.title})
: super(key: key);
final FirebaseAuth _auth;
final Building existingBuilding;
final String title;
@override
_BuildingsState createState() => _BuildingsState();
}
class _BuildingsState extends State<Buildings> {
@override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text('Buildings'),
),
//appBar: AppBar(title: Text('ListViews')),
floatingActionButtonLocation: FloatingActionButtonLocation.endTop,
floatingActionButton: FloatingActionButton(
child: Icon(Icons.add),
backgroundColor: Colors.green,
onPressed: () {
// setState(() {
// // i++;
// });
Navigator.pushNamed(context, 'add_building_screen');
},
),
body: BodyLayout(widget._auth, widget.existingBuilding),
bottomNavigationBar: BottomNavigationBar(
items: const <BottomNavigationBarItem>[
BottomNavigationBarItem(
icon: Icon(Icons.home),
label: 'Home',
),
BottomNavigationBarItem(
icon: Icon(Icons.help),
label: 'Help',
),
BottomNavigationBarItem(
icon: Icon(Icons.logout),
label: 'Logout',
),
],
currentIndex: 0,
selectedItemColor: Colors.amber[800],
onTap: (value) {
// FirebaseAuth.
// Firebase
if (value == 0) {
print(value);
print("** loading home");
Navigator.of(context).push(
new MaterialPageRoute(
builder: (BuildContext context) =>
new HomePageScreen("Landge Rent Manager", widget._auth)),
);
}
if (value == 1) {
print(value);
print("** help");
widget._auth.signOut();
}
if (value == 2) {
print(value);
print("** logging out");
widget._auth.signOut();
Navigator.pushNamed(context, 'login_screen');
}
},
),
);
}
}
class BodyLayout extends StatefulWidget {
//FirebaseFirestore _firestore = FirebaseFirestore.instance;
final FirebaseAuth _auth;
final Building existingBuilding;
const BodyLayout(this._auth, this.existingBuilding, {Key key})
: super(key: key);
@override
_BodyLayoutState createState() => _BodyLayoutState();
}
class _BodyLayoutState extends State<BodyLayout> {
@override
Widget build(BuildContext context) {
return _myListView(context, widget);
}
}
void deleteBuilding(Building building) async {
print(">>> id for deleteis " + building.id.toString());
try {
final existingDoc = FirebaseFirestore.instance
.collection("Buildings")
.doc(building.id.toString());
return await existingDoc.set({
'name': "${building.name}",
'address': "${building.address}",
"isActive": false
});
} on Exception catch (e) {
print(e);
}
}
// replace this function with the code in the examples
Widget _myListView(BuildContext context, Widget incomingWidget) {
return StreamBuilder(
stream: FirebaseFirestore.instance
.collection('Buildings')
.where("isActive", isEqualTo: true)
.snapshots(),
builder: (context, snapshot) {
if (!snapshot.hasData) {
return Container(child: Center(child: Text("No data")));
} else {
final buildings = snapshot.data.docs;
return ListView.builder(
itemCount: buildings.length,
itemBuilder: (context, index) {
return Card(
// <-- Card widget
child: ListTile(
leading: Icon(Icons.home),
title: Text(buildings[index].data()["name"] != null
? buildings[index].data()["name"]
: "-"),
subtitle: Column(
children: <Widget>[
Container(
child: Row(
children: <Widget>[
FlatButton(
child: Text("View Rooms"),
onPressed: () {
var id = buildings[index].reference.id != null
? buildings[index].reference.id
: "";
var name = buildings[index].data()["name"] != null
? buildings[index].data()["name"]
: "";
var address =
buildings[index].data()["address"] != null
? buildings[index].data()["address"]
: "";
Building currentBuilding =
new Building(id, name, "", address);
Navigator.of(context).push(new MaterialPageRoute(
builder: (BuildContext context) => new Rooms(
incomingWidget._auth,
incomingWidget.existingBuilding)));
},
),
FlatButton(
child: Text("Edit"),
onPressed: () {
var id = buildings[index].reference.id != null
? buildings[index].reference.id
: "";
var name = buildings[index].data()["name"] != null
? buildings[index].data()["name"]
: "";
var address =
buildings[index].data()["address"] != null
? buildings[index].data()["address"]
: "";
Building currentBuilding =
new Building(id, name, "", address);
var route = new MaterialPageRoute(
builder: (BuildContext context) =>
new EditBuilding(
widget._auth, widget.existingBuilding),
);
Navigator.of(context).push(new MaterialPageRoute(
builder: (BuildContext context) => Rooms(
widget._auth, widget.existingBuilding)));
Navigator.of(context).push(route);
// Navigator.pushNamed(
// context, 'edit_building_screen');
},
),
FlatButton(
child: Text("Delete"),
onPressed: () {
var id = buildings[index].reference.id != null
? buildings[index].reference.id
: "";
var name = buildings[index].data()["name"] != null
? buildings[index].data()["name"]
: "";
var address =
buildings[index].data()["address"] != null
? buildings[index].data()["address"]
: "";
Building currentBuilding =
new Building(id, name, "", address);
deleteBuilding(currentBuilding);
},
),
],
))
],
),
onTap: () {
Navigator.pushNamed(context, 'rooms_screen');
},
),
);
},
);
}
});
}