Maps Direction Line doesn't showing up on Maps - ios

Question

On trying to give direction line between User location to defined location. The pinpoints were right and exactly at the desired location but there is no 'Line' direction which leads User location to defined location.
It was done like this image:
and my code for drawing the maps along with parsing google maps API JSON:
func DrawDirection(url: String, cord: CLLocationCoordinate2D){
request(url).responseJSON { response in
let parsed = try? JSONSerialization.jsonObject(with: response.data!, options: []) as! [String:Any]
let routes = parsed!["routes"] as! [[String:Any]]
for route in routes {
let dictArr = route["legs"] as? [[String:Any]]
let dict = dictArr![0]["steps"] as? [[String:Any]]
let start = dict![0]["start_location"] as? [String:Any]
let lat = start!["lat"] as! Double
let long = start!["lng"] as! Double
let dotcoordinate = CLLocationCoordinate2D(latitude: CLLocationDegrees(lat), longitude: CLLocationDegrees(long))
let routePoly = route["overview_polyline"] as! [String:Any]
let points = routePoly["points"] as! String
let line = points
DispatchQueue.main.async {
let bounds = GMSCoordinateBounds(coordinate: cord, coordinate: dotcoordinate)
let update = GMSCameraUpdate.fit(bounds, with: UIEdgeInsetsMake(170, 30, 30, 30))
self.CinemaLoc.moveCamera(update)
}
self.AddingPolyLine(encString: line, dir: cord, dot: dotcoordinate)
}
}
}
func AddingPolyLine(encString: String, dir: CLLocationCoordinate2D, dot: CLLocationCoordinate2D){
let dotpath: GMSMutablePath = GMSMutablePath()
dotpath.add(CLLocationCoordinate2DMake(dir.latitude, dir.longitude)) //original loc
dotpath.add(CLLocationCoordinate2DMake(dot.latitude, dot.longitude)) //starting points
let dotpoly = GMSPolyline(path: dotpath)
dotpoly.map = self.CinemaLoc
dotpoly.strokeWidth = 3.0
let styles:[Any] = [GMSStrokeStyle.solidColor(.blue), GMSStrokeStyle.solidColor(.clear)]
let lengths:[Any] = [10,5]
dotpoly.spans = GMSStyleSpans(dotpoly.path!,styles as!
[GMSStrokeStyle], lengths as! [NSNumber], GMSLengthKind.rhumb)
let poly = GMSPolyline(path: dotpath)
poly.strokeWidth = 3.0
poly.strokeColor = .red
poly.map = self.CinemaLoc
}
cord is User location
been trying all possible way on stack overflow but not getting any change and sometimes there are log saying "Failed to load optimized model at path ~/GoogleMaps.bundle/GMSCacheStorage.momd/"
is there any wrong with my code?

Answer 1

Path should be created only once, for a specific path, and then you can add coordinates to the path. You're doing wrong by putting let dotpath: GMSMutablePath = GMSMutablePath() inside your method call, which gets called for every loop.

Answer 2

Sorry guys, problem fixed. there are misplaced on my url. and for adding polyline should be like this
let path = GMSMutablePath(fromEncodedPath: "String from overview json")
let poly = GMSPolyline(path: dotpath)
poly.strokeWidth = 3.0
poly.strokeColor = .red
poly.map = self.CinemaLoc
On routes loop, it should be no problem since google maps api only give 1 array of route, but for better practice. It should out of loop
Thank you and happy coding!