如何检测用户是否已通过Firebase和Facebook，电子邮件或Google通过Swift使用我的应用程序登录了我的应用程序 [英] How to detect if a user has signed in to my app using Firebase with Facebook, email, or Google using Swift

问题描述

我想检测用户是否使用Facebook或电子邮件等登录了

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

我找到了Android的答案，但是我正在使用Swift for iOS进行编程，并且不确定如何完全翻译代码.

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.

android/java代码为:

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");
  }
}

我尝试翻译它，但是我似乎无法弄清楚如何访问这些值.我一直在获取内存地址.

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.

这是我的快速代码:

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

推荐答案

根据 docs ， providerData 是 FIRUserInfo 结构的数组.

您发布的Android代码的(大部分)等效的Swift代码如下:

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")
        default:
            print("user is signed in with \(userInfo.providerID)")
    }
}

请注意， providerID 属性也可以直接在 currentUser 属性返回的 FIRUser 结构上使用，因此您可以做到这一点:

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 {
    default:
        print("user is signed in with \(providerID)")
    }
}

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