我建立了聊天应用。我在每个用户表中都有字段,允许检查用户是否在线。我只使用数据库引用来获取 isOnline 状态,并在拉到刷新时更新它。我看到用户打开或折叠应用时,应用会自动更新在线状态。我怎么能这样做?我是否需要任何监听器或任何框架可以帮助我升级我的代码))像ReactiveCocoa / ReactiveSwift ......
答案 0 :(得分:2)
当应用程序启动时,您可以在AppDelegate中在线更新用户
在线更新用户
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
}
离线更新用户
func applicationWillTerminate(_ application: UIApplication) {
if Auth.auth().currentUser != nil {
OnlineOfflineService.online(for: (Auth.auth().currentUser?.uid)!, status: false){ (success) in
print("User ==>", success)
}
}
}
Firebase在线和离线更新服务
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)
}
}
}
您还需要注意用户网络连接。如果用户网络连接断开,则只需使用参数
调用OnlineOfflineService
答案 1 :(得分:0)
第一
Database.database().isPersistenceEnabled = true
然后管理"存在"
let presenceRef = Database.database().reference(withPath: "disconnectmessage");
// Write a string when this client loses connection
presenceRef.onDisconnectSetValue("I disconnected!")
然后当用户断开连接时
presenceRef.onDisconnectRemoveValue { error, reference in
if let error = error {
print("Could not establish onDisconnect event: \(error)")
}
}
最后,检测状态
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")
}
})
现在好吗?
答案 2 :(得分:0)
我知道这是一个比较老的问题,但是如果您要在用户关闭应用程序时将在线/离线值设置为false,请使用.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)
}