Taylor Simpson Taylor Simpson - 1 year ago 102
Swift Question

How to detect if a user has signed in to my app using Firebase with Facebook, email, or Google using Swift

I want to detect if a user has signed in using Facebook or email, etc...

I found an answer for Android, but I am programming in Swift for iOS and I am not sure how to translate the code entirely.

The android/java code is :

for (UserInfo user:FirebaseAuth.getInstance().getCurrentUser().getProviderData()) {
if (user.getProviderId().equals("facebook.com")) {
System.out.println("User is signed in with Facebook");

I have tried to translate it, but I can't seem to figure out how to access the values. I keep getting a memory address instead.

Here is my swift code:

let authenticatedWith = FIRAuth.auth()?.currentUser?.providerData

par par
Answer Source

According to the docs, providerData is an array of FIRUserInfo structures.

The (mostly) equivalent Swift code for the Android code you posted looks like this:

if let providerData = FIRAuth.auth()?.currentUser?.providerData {
    for userInfo in providerData {
        switch userInfo.providerID {
        case "facebook.com":
            print("user is signed in with facebook")
            print("user is signed in with \(userInfo.providerID)")

Note that the providerID property is also available directly on the FIRUser structure returned by the currentUser property, so you may be able to just do this:

if let providerID = FIRAuth.auth()?.currentUser?.providerID {
    switch providerID {
        print("user is signed in with \(providerID)")
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