How to Log-in with Firebase in Swift UI? - swift

Question

I can create user through my code and get in to the next view but I can not log in with that mail address and password I just created. On the other hand, when I create a user in Firebase authentication page without programmatically, I can log in with that mail address and password. I don't know why this is happening.
My login button's codes are as following...
Button(action: {
self.verify()
}) {
Text("Log In")
}
func verify(){
if self.mail != "" && self.pass != ""{
Auth.auth().signIn(withEmail: self.mail, password: self.pass) { (res, err) in
if err != nil{
self.error = err!.localizedDescription
self.alert.toggle()
return
}
print("success")
UserDefaults.standard.set(true, forKey: "status")
NotificationCenter.default.post(name: NSNotification.Name("status"), object: nil)
}
}
else{
self.error = "Please fill all the contents properly"
self.alert.toggle()
}
}
My signUp button's codes are as following...
Button(action: {
self.register()
}) {
Text("Sign Up")
}
func register(){
if self.mail != ""{
if self.pass == self.repass{
Auth.auth().createUser(withEmail: self.mail, password: self.pass) { (res, err) in
if err != nil{
self.error = err!.localizedDescription
self.alert.toggle()
return
}
print("success")
UserDefaults.standard.set(true, forKey: "status")
NotificationCenter.default.post(name: NSNotification.Name("status"), object: nil)
}
}
else{
self.error = "Password mismatch"
self.alert.toggle()
}
}
else{
self.error = "Please fill all the contents properly"
self.alert.toggle()
}
}

Answer 1

To Sign In in Firebase I recommend some updates in your code:
Use completion to your Sign In and Sign Up functions, this way you know for sure that Firebase is answer you.
Handle listener AuthStateDidChangeListenerHandle. This listener gets called whenever the user's sign-in state changes.
API Authentification:
class AuthService {
static func signInUser(email: String, password: String, onSucces: #escaping() -> Void, onError: #escaping (_ errorMessage : String) -> Void ) {
Auth.auth().signIn(withEmail: email, password: password) { (authData, error) in
if (error != nil) {
print(error!.localizedDescription)
onError(error!.localizedDescription)
return
}
//Sign In Code
onSuccess()
}
static func signUpUser(email: String, password: String, username: String, onSucces: #escaping() -> Void, onError: #escaping (_ errorMessage : String) -> Void ) {
Auth.auth().createUser(withEmail: email, password: password) { (authData, error) in
if (error != nil) {
print(error!.localizedDescription)
onError(error!.localizedDescription)
return
}
//Sign Up Code
onSuccess()
}
}
}
in your View or ViewModel:
func verify() {
if self.mail != "" && self.pass != ""{
AuthService.signUpUser(email: email, password: password, username: username, onSucces: {
print("Sign In!")
}) { (error) in {
print("Error \(error)")
})
}
}
Class Session, to handle Auth Listener
class SessionAuth : ObservableObject {
#Published var isLoggedIn = true
var handle : AuthStateDidChangeListenerHandle?
func listenAuthentificationState() {
handle = Auth.auth().addStateDidChangeListener({ (auth, user) in
if let user = user {
//You are log in
// Your login process code
self.isLoggedIn = true
}
else {
//You are not
self.isLoggedIn = false
}
}
}
Your main View:
struct ContentView: View {
#ObservedObject var session : SessionAuth //or EnvironmentObject
func listen() {
session.listenAuthentificationState()
}
var body: some View {
Group {
if session.isLoggedIn {
MainLoggedView()
}
else {
SignInView()
}
}.onAppear(perform: listen)
}
}

Answer 2

In if else()
you need to "return ();"
and,
you should create login activity in programa manner.
FOR bETTER ResulT.