我有两个文件，在一个文件中，我有auth类，用于处理身份验证。
错误处理也在auth类中，我要做的就是将错误传递到登录屏幕，
这是我的认证类(class)
Future<FirebaseUser> handleSignInEmail(String email, String password) async {
FirebaseUser user;
var errorMessage;
try {
AuthResult result = await _auth.signInWithEmailAndPassword(
email: email, password: password);
user = result.user;
} catch (error) {
switch (error.code) {
case "ERROR_INVALID_EMAIL":
errorMessage = "Your email address appears to be malformed.";
break;
case "ERROR_WRONG_PASSWORD":
errorMessage = "Your password is wrong.";
break;
case "ERROR_USER_NOT_FOUND":
errorMessage = "User with this email doesn't exist.";
break;
case "ERROR_USER_DISABLED":
errorMessage = "User with this email has been disabled.";
break;
case "ERROR_TOO_MANY_REQUESTS":
errorMessage = "Too many requests. Try again later.";
break;
case "ERROR_OPERATION_NOT_ALLOWED":
errorMessage = "Signing in with Email and Password is not enabled.";
break;
default:
errorMessage = "An undefined Error happened.";
}
}
if (errorMessage != null) {
Body(
key: errorMessage,// the error occurs here :(
);
return Future.error(errorMessage);
}
return user;
}
class Body extends StatefulWidget {
final errorMess;
Body({Key key, this.errorMess}) : super(key: key);
@override
_BodyState createState() => _BodyState();
}
geterrorMesage() {
print(widget.errorMess);
}
无法将参数类型'String'分配给参数类型'Key'。
如何解决这个问题？
最佳答案
您可以在下面复制粘贴运行完整代码
您可以将_key传递给Body并使用_key.currentState调用geterrorMesage程式码片段
GlobalKey _key = GlobalKey();
...
final _BodyState _bodyState = _key.currentState;
_bodyState.geterrorMesage("this is test");
...
Body(
key: _key,
errorMess: "no error",
),
...
geterrorMesage(String errorMess) {
print(errorMess);
setState(() {
_errorMess = errorMess;
});
}
完整的代码
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
GlobalKey _key = GlobalKey();
void _incrementCounter() {
final _BodyState _bodyState = _key.currentState;
_bodyState.geterrorMesage("this is test");
setState(() {
_counter++;
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.headline4,
),
Body(
key: _key,
errorMess: "no error",
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
}
class Body extends StatefulWidget {
final errorMess;
Body({Key key, this.errorMess}) : super(key: key);
@override
_BodyState createState() => _BodyState();
}
class _BodyState extends State<Body> {
String _errorMess = "";
geterrorMesage(String errorMess) {
print(errorMess);
setState(() {
_errorMess = errorMess;
});
}
@override
void initState() {
super.initState();
_errorMess = widget.errorMess;
}
@override
Widget build(BuildContext context) {
return Text("${_errorMess}");
}
}
关于firebase - 如何在有状态的小部件中使用键？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/63166918/