Internet Reconnection Swift - ios

Question

My app currently shows an alert if there isn't an internet connection. However, I would like it to reconnect automatically once internet connection is detected without user needing to restart the app.
the code for I used currently is
if Reachability.isConnectedToNetwork() == true {
print("Internet Connection Available!")
} else {
let alertController = UIAlertController(title: "Alert",
message: "Internet Connection not Available!",
preferredStyle: UIAlertControllerStyle.alert)
alertController.addAction(UIAlertAction(title: "Dismiss", style: UIAlertActionStyle.default,handler: nil))
self.present(alertController, animated: true, completion: nil)
}
anyone can give some advice? if my question isn't clear, do let me know. Thx guys!

Answer 1

You should addObserver of Reachability in applicationDidFinishLaunching method, like below,
NotificationCenter.default.addObserver(self, selector: #selector(networkStatusChanged(_:)), name: NSNotification.Name(rawValue: ReachabilityStatusChangedNotification), object: nil)
Reach().monitorReachabilityChanges()
Implement this method as well,
#objc func networkStatusChanged(_ notification: Notification) {
let userInfo = (notification as NSNotification).userInfo
if let status = userInfo?["Status"] as? String, status == "Offline" {
//Display alert view
} else if let status = userInfo?["Status"] as? String, status != "Unknown" {
//Internet connection is active
}
}
Above function automatically triggers call when there is active internet connection.

Answer 2

It's Working well for me
func myconn(){
if Reachability.isConnectedToNetwork() == true
{
print("Internet Connection Available!")
}
else
{
let alertController = UIAlertController(title: "Alert", message:
"Internet Connection not Available!", preferredStyle: UIAlertControllerStyle.alert)
alertController.addAction(UIAlertAction(title: "Dismiss", style: UIAlertActionStyle.default,handler: nil))
self.present(alertController, animated: true, completion: nil)
DispatchQueue.main.asyncAfter(deadline: .now() + 10.0, execute: {
self.myconn()
})
}
}

Answer 3

You need to add addObserver of ReachabilityChangedNotification.
NSNotificationCenter.defaultCenter().addObserver(self, selector:"checkForReachability:", name: ReachabilityChangedNotification, object: nil);
self.reachability = Reachability.reachabilityForInternetConnection();
self.reachability.startNotifier();
func checkForReachability(notification:NSNotification)
{
let networkReachability = notification.object as Reachability;
var remoteHostStatus = networkReachability.currentReachabilityStatus()
if (remoteHostStatus.value == NotReachable.value)
{
print("Not Reachable")
}
else if (remoteHostStatus.value == ReachableViaWiFi.value)
{
print("Reachable via Wifi")
}
else
{
print("Reachable")
}
}
Whenever change the network it will notify you.

Answer 4

You could also use RxSwift to observe you reachability notifications and deal with the changes whenever you get a new connection state.
like this:
var isOnline: Bool {
guard let reachability = reachability else { return false }
return reachability.currentReachabilityStatus.isOnline
}
func connectionStatus() -> Observable<ConnectionStatus> {
return notificationCenter
.rx
.notification(ReachabilityChangedNotification)
.observeOn(observeScheduler)
.flatMap { notification -> Observable<ConnectionStatus> in
guard let reachability = notification.object as? Reachability else {
return .empty()
}
return .just(ConnectionStatus(isOnline: reachability.isReachable))
}
.startWith(ConnectionStatus(isOnline: isOnline))
.distinctUntilChanged()
}
This way you'll be observing any changes in the connection and can react to it the you you want.
You just need to Subscribe to the Observable<ConnectionStatus> and then you can decide if you want the user to trigger a new reconnection flow or if you would retry a few times before displaying it.