Update GMSMarker location as realtime message received Swift 3.1 - ios

Question

I am new to swift. I am working on an app which shows markers moving on location update when realtime message is received.
View and Steps
Home (Map Screen which will show tracking results) and Search Button
On search button click, a new search view has been displayed. User
types and search
On search result view if found, a table view is shown. User can
select multiple to subscribe and "Add to tracking list"
On "Add to tracking list", app subscribe on realtime api and should start displaying results (on first view - Home) as message received.
Issue:
I am using delegate to share data (method: messageReceived) from MesssagingProcessor class to FirstViewController. Problem is "messageReceived" is not called in MesssagingProcessor class because delegate is nil.
To go back to first, I used following code
self.navigationController?.popToRootViewController(animated: true)
To subscribe,
channel.subscribe { message in
print(message.name ?? Constant.NIL_DEFAULT_TEXT)
print(message.data ?? Constant.NIL_DEFAULT_TEXT)
self.messageProcessor.process(message: message)
}
return true
I am using delegate to share data between classes and viewcontrollers
Delegate Class:
protocol MesssagingProcessorDelegate {
func messageReceived(msg: MessageMO)
}
class MesssagingProcessor {
//MAR: Properties
var delegate: MesssagingProcessorDelegate?
var info = ""
//MARK: Constructor
init() {
info = "I am set"
}
//MARK: Functions
func process(message: <MessageTypeHere>) {
let msg = MessageMO(dataString: message.data as! String, colString: Constant.EP.C_MSG)
if MessagingHelper.validMessage(msg: msg) {
if msg.type == Constant.TYPE_MSG_LOC {
if msg.location != nil {
delegate?.messageReceived(msg: msg)
}
else {
print("No location found in Location Message. Message: \(String(describing: message.data))")
}
}
}
}
}
Home View Controller:
import UIKit
import GoogleMaps
import UserNotifications
class FirstViewController: UIViewController, MesssagingProcessorDelegate {
//MARK: Properties
let messsagingProcessor: MesssagingProcessor = MesssagingProcessor()
var bounds = GMSCoordinateBounds()
var mapView: GMSMapView? = nil
//MARK: Events
override func viewDidLoad() {
super.viewDidLoad()
let button = UIButton.init(type: .custom)
button.setImage(UIImage.init(named: "logo"), for: UIControlState.normal)
button.addTarget(self, action:#selector(showTrackeeOptions), for: UIControlEvents.touchUpInside)
button.frame = CGRect.init(x: 0, y: 0, width: 30, height: 30) //CGRectMake(0, 0, 30, 30)
let barButton = UIBarButtonItem.init(customView: button)
self.navigationItem.leftBarButtonItem = barButton
let camera = GMSCameraPosition.camera(withLatitude: 53.34624,
longitude: -6.24134, zoom: 6)
mapView = GMSMapView.map(withFrame: CGRect.zero, camera: camera)
mapView!.isMyLocationEnabled = true
mapView!.settings.setAllGesturesEnabled(true)
mapView!.delegate = self
self.view = mapView!
//
let marker = GMSMarker()
marker.position = CLLocationCoordinate2DMake(-33.86, 151.20)
marker.title = "TEST"
marker.snippet = Generic.toImageURL(name: "_demo_bus.png", category: Constant.TYPE_IMG_MARKER, type: Constant.TYPE_USER) + "^TestTest Test <-> Demo Bus^Available^2.3 km/h^1493729075106^10^0^333"
marker.map = mapView!
messsagingProcessor.delegate = self
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
//MARK: Events
//MARK: MesssagingProcessorDelegate
func messageReceived(msg: MessageMO) {
let mk = MarkerMO(msg: msg).add()
var marker: GMSMarker
if mk != nil {
let imgURL = Generic.toImageURL(name: mk!.iconMarker, category: Constant.TYPE_IMG_MARKER, type: Constant.TYPE_USER)
var sharedInfo = imgURL
sharedInfo += Constant.SEPARATOR_LIST_ITEM
sharedInfo += mk!.name! + Constant.SEPARATOR_LIST_ITEM
sharedInfo += mk!.status + Constant.SEPARATOR_LIST_ITEM
sharedInfo += mk!.speed + Constant.SEPARATOR_LIST_ITEM
sharedInfo += String(mk!.time) + Constant.SEPARATOR_LIST_ITEM
sharedInfo += String(mk!.interval)
if mk!.gMarker != nil {
marker = GMSMarker()
} else {
marker = mk!.gMarker!
}
CATransaction.begin()
CATransaction.setAnimationDuration(1.0)
marker.position = CLLocationCoordinate2D(latitude: (mk!.location!.latitude), longitude: (mk!.location!.longitude))
marker.icon = Generic.toImageByURL(url: imgURL, width: Constant.ICON_DEFAULT_MARKER_WIDTH, height: Constant.ICON_DEFAULT_MARKER_HEIGHT, defaultImage: "defaultmarker")
marker.title = mk!.name
marker.snippet = sharedInfo
marker.map = self.mapView
CATransaction.commit()
mk!.updateGMarker(marker: marker)
self.bounds = self.bounds.includingCoordinate(marker.position)
}
else {
//TODO: Error in marker generation
}
}
}
extension FirstViewController: GMSMapViewDelegate {
//For Info WindowIndow
func mapView(_ mapView: GMSMapView, markerInfoWindow marker: GMSMarker) -> UIView? {
let infoWindow = Bundle.main.loadNibNamed("LocMarkerInfoWindow", owner: self.view, options: nil)!.first! as! LocMarkerInfoWindowController
print(marker.snippet!)
let info = marker.snippet!.components(separatedBy: Constant.SEPARATOR_LIST_ITEM)
infoWindow.iconMarker.image = Generic.toImageByURL(url: info[0], width: Constant.ICON_INFOWIN_MARKER_WIDTH, height: -1, defaultImage: "defaultmarker")
infoWindow.name.text = info[1]
infoWindow.status.text = info[2]
infoWindow.speed.text = info[3]
infoWindow.lastUpdatedOn.text = Double(info[4])?.getDateStringFromTimeStamp()
infoWindow.interval.text = info[5]
return infoWindow
}
}
I will really appreciate any help regarding this. Thank you

Answer 1

I have resolved the issue by declaring messsagingProcessor as global and using it in view controller and class.
let messsagingProcessor: MesssagingProcessor = MesssagingProcessor()
Previously, I was declaring and using different objects in view controller class and client class.
I hope it may help someone. Thanks anyway