Polling with Timer

Polling.swift

func startPollingComments(){
        if let cStream = currentStream, connected == true{ 
//the code would not continue if its NOT connected. hence the Timer shcedule will not be generated, this stops the polling
            let stream = cStream as! FBLiveStream
            stream.getLastComments(completion: { (comments, error) in
                if (error == nil){
                    self.onCommentsUpdate?(comments as! [Dictionary<String, Any>])
                }
                Timer.scheduledTimer(withTimeInterval: 5.0, repeats: false, block: {timer in
                    self.startPollingComments()
                })
            })
        }
    
    }