Bug while error handling Firebase Authentication with swiftUI - swift

Question

This is my AuthViewModel:
#Published var userSession: User?
#Published var currentUser: AppUser?
#Published var signupError: Error?
#Published var loginError: Error?
static let shared = AuthViewModel()
init() {
self.userSession = Auth.auth().currentUser
fetchUser()
}
func fetchUser() {
guard let uid = userSession?.uid else { return }
USER_COLLECTION.document(uid).getDocument { snapshot, _ in
guard let user = try? snapshot?.data(as: AppUser.self) else { return }
self.currentUser = user
}
}
func registerUser(withEmail email: String, password: String) {
Auth.auth().createUser(withEmail: email, password: password) { result, error in
if let error = error {
self.signupError = error
print("error")
return
}
guard let user = result?.user else { return }
let data: [String: Any] = ["uid": user.uid, "email": user.email ?? ""]
USER_COLLECTION.document(user.uid).setData(data) { err in
self.userSession = user
self.fetchUser()
}
}
}
func login(withEmail email: String, password: String) {
Auth.auth().signIn(withEmail: email, password: password) { result, error in
if let error = error {
self.loginError = error
return
}
guard let user = result?.user else { return }
self.userSession = user
self.fetchUser()
}
}
I have 2 published variables which are updated every time there is an error in their respective functions. However, when I click the 'sign up' button the first time with invalid credentials, I don't get an alert. I have to click it the second time to see the alert. Attached below is the code from the sign up view SwiftUI button with action and label. The same applies to the login view.
Button {
authViewModel.registerUser(withEmail: email, password: password)
print("called")
if let error = authViewModel.signupError {
alertTitle = "Error signing up!"
alertMessage = error.localizedDescription
alertShowing = true
print(alertShowing)
}
print(alertShowing)
} label: {
CustomAuthButton(text: "Sign Up")
}
Below is the code attached to the sign up view (navigation view):
.alert(alertTitle, isPresented: $alertShowing) {
Button("OK") {
authViewModel.signupError = nil
}
} message: {
Text(alertMessage)
}
Attached below is the code for registering a user. I'll put the result of those print statements below.
Auth.auth().createUser(withEmail: email, password: password) { result, error in
if let error = error {
DispatchQueue.main.async {
self.signupError = error
print("error")
return
}
}
called
false
2022-07-06 12:59:54.424510+0530 InfoMax[62528:2751506] [boringssl] boringssl_metrics_log_metric_block_invoke(153) Failed to log metrics
error
As you can see, error is being printed late. When I tap the button the second time, it is printed before, so I get the alert.