Swift 4 Firebase online status update - swift

Question

I build chat app. I have field in each user table which allow to check if user Online. I use just database reference to get isOnline status and update it when pull to refresh. I seen that apps update online status automatically when user open or fold app. How i can do that? Do i need any listener or any framework can help me upgrade my code)) Something like ReactiveCocoa/ReactiveSwift...
P.S sorry for cyrillic text on field isOnline) it means Online/Offline

Answer 1

When application start you can update user online in AppDelegate
Update user online
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
FirebaseApp.configure()
// status parameter indicate user Online
if Auth.auth().currentUser != nil {
OnlineOfflineService.online(for: (Auth.auth().currentUser?.uid)!, status: true){ (success) in
print("User ==>", success)
}
}
return true
}
Update user Offline
func applicationWillTerminate(_ application: UIApplication) {
if Auth.auth().currentUser != nil {
OnlineOfflineService.online(for: (Auth.auth().currentUser?.uid)!, status: false){ (success) in
print("User ==>", success)
}
}
}
Firebase online and offline update service
import UIKit
import FirebaseDatabase
struct OnlineOfflineService {
static func online(for uid: String, status: Bool, success: #escaping (Bool) -> Void) {
//True == Online, False == Offline
let onlinesRef = Database.database().reference().child(uid).child("isOnline")
onlinesRef.setValue(status) {(error, _ ) in
if let error = error {
assertionFailure(error.localizedDescription)
success(false)
}
success(true)
}
}
}
Also you need to take care about user network connection. If user network connection off you just call OnlineOfflineService with parameters

Answer 2

I know this is an older question, but if you want to set the online/offline value to false when user closes app, use .onDisconnectSetValue():
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
FirebaseApp.configure()
setInactivityObservers()
return true
}
func setInactivityObservers() {
guard let user = Auth.auth().currentUser else { return }
// get user branch of database
let ref = Database.database().reference()
let usersRef = ref.child("Users")
let userRef = usersRef.child(user.uid)
// set "isOnline" branch to true when app launches
userRef.child("isOnline").setValue(true)
// set value to false when user terminates app
userRef.child("isOnline").onDisconnectSetValue(false)
}

Answer 3

First
Database.database().isPersistenceEnabled = true
Then manage the "presence"
let presenceRef = Database.database().reference(withPath: "disconnectmessage");
// Write a string when this client loses connection
presenceRef.onDisconnectSetValue("I disconnected!")
Then when the user is disconnected
presenceRef.onDisconnectRemoveValue { error, reference in
if let error = error {
print("Could not establish onDisconnect event: \(error)")
}
}
And Finally, to detect the status
let connectedRef = Database.database().reference(withPath: ".info/connected")
connectedRef.observe(.value, with: { snapshot in
if snapshot.value as? Bool ?? false {
print("Connected")
} else {
print("Not connected")
}
})
Is it ok now ?