Flutter app crashes on firebase phone auth in iOS platform

Question

I have implemented Firebase Phone auth in my project,

On android side everything works fine, but for iOS side, when i try to send verification code from my end, app crashes and lost connection.

I have submitted my code below.

main.dart

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
        home: new MyHomePage(),
        routes: <String, WidgetBuilder> {
          '/homepage': (BuildContext context) => MyApp(),
          '/landingpage': (BuildContext context) => MyHomePage()
        }
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => new _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  String phoneNo;
  String smsCode;
  String verificationId;

  Future<void> verifyPhone() async {
    print("main");
    final PhoneCodeAutoRetrievalTimeout autoRetrieve = (String verId) {
      print("varification id");
      this.verificationId = verId;
    };

    final PhoneCodeSent smsCodeSent = (String verId, [int forceCodeResend]) {
      print("send code dilog");
      this.verificationId = verId;
      smsCodeDialog(context).then((value) {
        print('Signed in');
      });
    };

    final PhoneVerificationCompleted verifiedSuccess = (AuthCredential user){
      print('Phone Verification Completed');
    };

    final PhoneVerificationFailed veriFailed = (AuthException exception) {
      print('${exception.message}');
    };

    await FirebaseAuth.instance.verifyPhoneNumber(

        phoneNumber: "+919700000000",
        codeAutoRetrievalTimeout: autoRetrieve,
        codeSent: smsCodeSent,
        timeout: const Duration(seconds: 5),
        verificationCompleted: verifiedSuccess,
        verificationFailed: veriFailed);
  }

  Future<bool> smsCodeDialog(BuildContext context) {
    return showDialog(
        context: context,
        barrierDismissible: false,
        builder: (BuildContext context) {
          return new AlertDialog(
            title: Text('Enter sms Code'),
            content: TextField(
              onChanged: (value) {
                this.smsCode = value;
              },
            ),
            contentPadding: EdgeInsets.all(10.0),
            actions: <Widget>[
              new FlatButton(
                child: Text('Done'),
                onPressed: () {
                  FirebaseAuth.instance.currentUser().then((user) {
                    if (user != null) {
                      Navigator.of(context).pop();
                      Navigator.of(context).pushReplacementNamed('/homepage');
                    } else {
                      Navigator.of(context).pop();
                      signIn();
                    }
                  });
                },
              )
            ],
          );
        });
  }

  signIn(){
    final AuthCredential credential = PhoneAuthProvider.getCredential(
        verificationId: verificationId,
        smsCode: smsCode);

    FirebaseAuth.instance.signInWithCredential(credential).then((user){
      Navigator.of(context).pushReplacementNamed('/homepage');
    }).catchError((e){
      print('Auth Credential Error : $e');
    });
  }

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: new Text('PhoneAuth'),
      ),
      body: new Center(
        child: Container(
            padding: EdgeInsets.all(25.0),
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                TextField(
                  decoration: InputDecoration(hintText: 'Enter Phone number'),
                  onChanged: (value) {
                    this.phoneNo = value;
                  },
                ),
                SizedBox(height: 10.0),
                RaisedButton(
                    onPressed: verifyPhone,
                    child: Text('Verify'),
                    textColor: Colors.white,
                    elevation: 7.0,
                    color: Colors.blue)
              ],
            )),
      ),
    );
  }
}

this is error while submit the button

Launching lib/main.dart on Dhruvin’s iPhone in debug mode...
Automatically signing iOS for device deployment using specified development team in Xcode project: ******
Running Xcode build...
Xcode build done.                                           99.4s
Installing and launching...
Syncing files to device Dhruvin’s iPhone...
Lost connection to device.

However i am not able to see stacktrace or log as app lost connection from debugger.

Answer 1

i Solved the Problem, thank you so much @DevarshRanpura for Helping me,

1) replace

signIn(){
    final AuthCredential credential = PhoneAuthProvider.getCredential(
        verificationId: verificationId,
        smsCode: smsCode);

    FirebaseAuth.instance.signInWithCredential(credential).then((user){
      Navigator.of(context).pushReplacementNamed('/homepage');
    }).catchError((e){
      print('Auth Credential Error : $e');
    });
  }

to this

signIn() async {
    final AuthCredential credential = PhoneAuthProvider.getCredential(
      verificationId: verificationId,
      smsCode: smsCode,
    );
    final AuthResult authResult = await _auth.signInWithCredential(credential);
    final FirebaseUser user = authResult.user;
    print('User Id : ' + user.uid);
  }

also Define _auth on your dart file

final FirebaseAuth _auth = FirebaseAuth.instance;

2) adding reverse client id in to your project

• open your project in xcode
• double click on your project name
• go to the info tab
• In URL Types->URL schemes add the reverse client Id