Why am I having issues with my flutter firebase authentification?
Question
My goal is to sign in with an existing account on my firebase data and show exceptions when the account is not existing... I followed some tutorials and the official firebase and flutter documentation. When I'm trying to log with an not existing or existing account the button login to naviguate in the home screen doesn't work.
Plus I have this error message type 'String' is not a subtype of type 'TextEditingController' in type cast
I have two pages code for this function
First my code in auth Provider Service Screen:
import 'package:firebase_auth/firebase_auth.dart';
class AuthClass {
FirebaseAuth auth = FirebaseAuth.instance;
Future<String?> signIN({required String email, required String password}) async {
try {
await auth.signInWithEmailAndPassword(
email: email,
password: password,);
return "Welcome";
} on FirebaseAuthException catch (e) {
if (e.code == 'user-not-found') {
return 'No user found for that email.';
} else if (e.code == 'wrong-password') {
return 'Wrong password provided for that user.';
}
}
}
}
and this is my body login screen code:
import 'package:yona/WelcomePage/WelcomePage.dart';
class Body extends StatefulWidget {
const Body({
Key? key,
}) : super(key: key);
@override
_BodyState createState() => _BodyState();
}
class _BodyState extends State<Body> {
final GlobalKey<FormState> _formKey = GlobalKey<FormState>();
final auth = FirebaseAuth.instance;
TextEditingController _email = TextEditingController();
TextEditingController _password = TextEditingController();
@override
Widget build(BuildContext context) {
Size size = MediaQuery
.of(context)
.size;
return Background(
child: Form(
key: _formKey,
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text("LOGIN", style: TextStyle(
color: Colors.white,
fontWeight: FontWeight.bold,
fontSize: 20)),
Container(child: Image.asset('assets/ctlogo.png', height: 200),
),
// Container
RoundedInputField(
hintText: "Your Email",
onChanged: (value) {
setState(() {
_email = value.trim() as TextEditingController;
});
}
),
RoundedPasswordField(
onChanged: (value) {
setState(() {
_password = value.trim() as TextEditingController;
});
},
),
Container(margin: EdgeInsets.symmetric(vertical: 20),
width: 300,
child: ClipRRect(
borderRadius: BorderRadius.circular(29),
// ignore: deprecated_member_use
child: FlatButton(
padding: EdgeInsets.symmetric(vertical: 14, horizontal: 40),
color: SandYellow,
onPressed: () {
AuthClass()
.signIN(
email: _email.text.trim(), password: _password.text.trim())
.then((value) {
if (value == 'Welcome') {
Navigator.pushAndRemoveUntil(
context,
MaterialPageRoute(
builder: (context) => HomeScreen()),
(route) => false);
}
else{
ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(value!)));
}
}
);
},
child: Text("LOGIN",
style: TextStyle(color: DarkTurquoise,
fontSize: 16,)
),
),
),
),
2 answers
solution1
2 ACCPTED 2021-08-14 14:13:48
value.trim() as TextEditingController;
value is already String so you can not type cast to TextEditingController. _email variable should be a String in that way.
You can just delete as TextEditingController this part. so It will be worked.
Edit:
TextEditingController _email = TextEditingController();
TextEditingController _password = TextEditingController();
these variables should not be a Controller, should be a String.
String _email = '';
String _password = '';
solution2
0 2021-08-14 15:43:31
No need to setState when changing TextEditingController value.
onChanged: (value) {
_email.text = value.trim();
}),
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