IOS Reachibility in whole app and just on on view load

Question

I've added the following code to the viewDidLoad of my view controller:

let reachability: Reachability
        do {
            reachability = try Reachability.reachabilityForInternetConnection()
        } catch {
            print("Unable to create Reachability")
            return
        }

        reachability.whenReachable = { reachability in
            // this is called on a background thread, but UI updates must
            // be on the main thread, like this:
            dispatch_async(dispatch_get_main_queue()) {
                if reachability.isReachableViaWiFi() {
                    print("Reachable via WiFi")
                } else {
                    print("Reachable via Cellular")
                }
            }
        }
        reachability.whenUnreachable = { reachability in
            // this is called on a background thread, but UI updates must
            // be on the main thread, like this:
            dispatch_async(dispatch_get_main_queue()) {
                print("Not reachable")
            }
        }

        do {
            try reachability.startNotifier()

        } catch {
            print("Unable to start notifier")
        }

It is notifying me of when the view loads however not when the state changes after the load. I'm wondering how to expand this so that I can have a notification anywhere in the application an not just on when the view loads as the internet may come back after a view loads.

Thanks

Answer 1

You should declare the reachability variable as instance variable and not only as local variable within a function. You could further use notifications to make the information available across your app. Just make sure the instance containing the reachability variable lives during the lifecycle of your app.