blocks|key|2753351|text|检查用户是否已登录：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2753352|if+Auth.auth().currentUser+!=+nil+{
+//+User+is+signed+in.
+//+...
}+else+{
++//+No+user+is+signed+in.
+//+...
}|code-block|syntax|javascript|2753353|如果用户已登录，则转到Home+ViewController。这样，当他再次打开应用程序时，他会去Home+ViewController，除非他签了FIRAuth.auth().signOut()|offset|length|style|CODE|2753354|有关更多信息，请查看以下内容：https://firebase.google.com/docs/auth/ios/manage-users|2753355|entityMap|0|LINK|mutability|MUTABLE|url|https://firebase.google.com/docs/auth/ios/manage-users^0|0|0|G|E|1I|E|22|O|0|F|1I|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@$I|Z|J|10|K|L]|$I|11|J|12|K|L]|$I|13|J|14|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|15|8|@]|9|@$I|16|J|17|1|18]]|A|$]]|$1|O|3|-4|5|6|7|19|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

Check if the user is logged in or not:

<pre><code>if Auth.auth().currentUser != nil {
 // User is signed in.
 // ...
} else {
 // No user is signed in.
 // ...
}
</code></pre>

if the user is logged in, then go the Home <code>ViewController</code>. This way when he opens the app again he will go to the Home <code>ViewController</code> unless he sign outs<code>FIRAuth.auth().signOut()</code>

For more info check this: <a href="https://firebase.google.com/docs/auth/ios/manage-users" rel="nofollow noreferrer">https://firebase.google.com/docs/auth/ios/manage-users</a>

blocks|key|1337603|text|为了保持用户登录，您需要检查currentUser+8月会话，如果不是零，则可以将用户重定向到主屏幕。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1337604|在"setRootViewController“()代码之后从didFinishLaunchingWithOptions，调用FirebaseApp.configure方法|offset|length|style|BOLD|1337605|Swift+4|1337606|++++func+setRootViewController()+{
++++++++if+Auth.auth().currentUser+!=+nil+{
++++++++++++//+Set+Your+home+view+controller+Here+as+root+View+Controller
++++++++++++self.presentTabBar()
++++++++}+else+{
++++++++++++//+Set+you+login+view+controller+here+as+root+view+controller
++++++++}
++++}|code-block|syntax|javascript|1337607|entityMap^0|0|2|L|V|T|0|0|7|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@$D|S|E|T|F|G]|$D|U|E|V|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|W|8|@$D|X|E|Y|F|G]]|9|@]|A|$]]|$1|J|3|K|5|L|7|Z|8|@]|9|@]|A|$M|N]]|$1|O|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|P|$]]

For keep user login you need to check currentUser Auth session, If it's not nil then you can redirect user to Home screen. 

Call "setRootViewController" method from didFinishLaunchingWithOptions, just after FirebaseApp.configure() code 

Swift 4

<pre><code> func setRootViewController() {
 if Auth.auth().currentUser != nil {
 // Set Your home view controller Here as root View Controller
 self.presentTabBar()
 } else {
 // Set you login view controller here as root view controller
 }
 }
</code></pre>

blocks|key|2753422|text|以下是2020年的一个方便的完整示例：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2753423|在您的iOS%2BFirebase应用程序中的任何地方，您都可以简单地说：|2753424|guard+let+uid+=+Auth.auth().currentUser?.uid+else+{
++++return+print("no+current+user!")
}|code-block|syntax|javascript|2753425|因此，在应用程序的启动屏幕上，只需：|2753426|import+UIKit
import+Firebase
import+FirebaseUI

class+ViewController:+UIViewController,+FUIAuthDelegate+{

++++override+func+viewDidAppear(_+animated:+Bool)+{
++++++++super.viewDidAppear(animated)

++++++++guard+let+uid+=+Auth.auth().currentUser?.uid+else+{
++++++++++++return+print("no+current+user,+hence+AuthUI+flow...")
++++++++++++basicAuthUIFlow()
++++++++}
++++++++print("User+..+\(Auth.auth().currentUser?.displayName)")
++++++++continueWhenUserPresent()
++++}|2753427|就这么简单。所以像往常一样..。|2753428|++++private+func+basicAuthUIFlow()+{
++++++++let+authUI+=+FUIAuth.defaultAuthUI()
++++++++authUI?.delegate+=+self
++++++++let+pp:+[FUIAuthProvider]+=+[+FUIGoogleAuth()+]
++++++++authUI?.providers+=+pp
++++++++if+let+authVC+=+authUI?.authViewController()+{
++++++++++++present(authVC,+animated:+true)
++++++++}
++++}

++++func+authUI(_+authUI:+FUIAuth,
++++++didSignInWith+authDataResult:+AuthDataResult?,url:+URL?,+error:+Error?)+{
++++++++let+u+=+authDataResult?.user
++++++++print("Successful+login+via+authUI+\(String(describing:+u?.displayName))")
++++++++continueWhenUserPresent()
++++}

++++private+func+continueWhenUserPresent()+{
++++++++..+pushViewController+..+your+first+screen
++++}|2753429|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|V|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|W|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

Here's a handy full example for 2020:

Anywhere in your iOS+Firebase app, you can simply say:

<pre><code>guard let uid = Auth.auth().currentUser?.uid else {
 return print("no current user!")
}
</code></pre>

Thus, on the launch screen of your app, simply:

<pre><code>import UIKit
import Firebase
import FirebaseUI

class ViewController: UIViewController, FUIAuthDelegate {

 override func viewDidAppear(_ animated: Bool) {
 super.viewDidAppear(animated)

 guard let uid = Auth.auth().currentUser?.uid else {
 return print("no current user, hence AuthUI flow...")
 basicAuthUIFlow()
 }
 print("User .. \(Auth.auth().currentUser?.displayName)")
 continueWhenUserPresent()
 }
</code></pre>

It's that easy. So then as usual ...

<pre><code> private func basicAuthUIFlow() {
 let authUI = FUIAuth.defaultAuthUI()
 authUI?.delegate = self
 let pp: [FUIAuthProvider] = [ FUIGoogleAuth() ]
 authUI?.providers = pp
 if let authVC = authUI?.authViewController() {
 present(authVC, animated: true)
 }
 }

 func authUI(_ authUI: FUIAuth,
 didSignInWith authDataResult: AuthDataResult?,url: URL?, error: Error?) {
 let u = authDataResult?.user
 print("Successful login via authUI \(String(describing: u?.displayName))")
 continueWhenUserPresent()
 }

 private func continueWhenUserPresent() {
 .. pushViewController .. your first screen
 }
</code></pre>

I'm using Firebase to handle my user register and login for my app. But if I log in, and then close my app entirely - the user is forced to re-log in. I'd like to keep the user logged in unless they click "Log out"

My login code is this:

<pre><code> Auth.auth().signIn(withEmail: email, password: password, completion: {(user, error) in
 if let firebaseError = error {
 print(firebaseError.localizedDescription)
 return
 }
 self.presentTabBar()
 })
 }
}
</code></pre>

How do I keep this user logged in unless specifically told to logout?

Firebase Login Persistence Swift

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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