Waiting for a background thread to complete before function return

Question

I try to create function that return Internet status as Bool:

func isConnectedToNetwork()->Bool{
    var InternetStatus = Bool()
    RealReachability.sharedInstance().reachabilityWithBlock { (status:ReachabilityStatus) in
        switch status {
        case .RealStatusNotReachable:
            InternetStatus = false
        default:
            InternetStatus = true

        }
    }
   return InternetStatus
}

But I have a problem, RealReachability.sharedInstance().reachabilityWithBlock {} works in background thread, and function return before background thread complete.

How to wait background thread result before function return?

Answer 1

Don't wait, tell.

Use a completion handler which is called when the asynchronous task has been completed

func isConnectedToNetwork(completion:(Bool -> Void)) {
    RealReachability.sharedInstance().reachabilityWithBlock { (status:ReachabilityStatus) in
        switch status {
        case .RealStatusNotReachable:
            completion(false)
        default:
            completion(true)
        }
    }
}

and call it

isConnectedToNetwork { success in
  print(success)
  // do something with the success value
}