Swift 3: How to remove the tracked polyline in Google map

Question

I have draw the polylines, but I don't no that what coding can remove the tracked polyline in the google map. I'm trying some coding in below.

---

this is no working.

var polyline = GMSPolyline()
   polyline.map = nil 

---

this is working to remove tracked polyline, but when I'm maked the markers and tap it, marker can not sow the info window.

mapView.clear()

Thank you

Answer 1

Solution:

1. create polyline: teaching polyline by GoogleMapsAPIs
2. create variable oldPolylineArr/oldPolyline type GMSPolyline/GMSPolyline_Array
3. store the polyline to the oldPolyline
4. remove the polyline

Sample Coding:

//Step 1:
var mapView = GMSMapView()
let path = GMSMutablePath()
path.add(CLLocationCoordinate2D(latitude: 37.36, longitude: -122.0))
path.add(CLLocationCoordinate2D(latitude: 37.45, longitude: -122.0))
path.add(CLLocationCoordinate2D(latitude: 37.45, longitude: -122.2))
path.add(CLLocationCoordinate2D(latitude: 37.36, longitude: -122.2))
path.add(CLLocationCoordinate2D(latitude: 37.36, longitude: -122.0))
let rectangle = GMSPolyline(path: path)

//Step 2:
var oldPolylineArr = [GMSPolyline]()

Array

//Step 3:
oldPolyline.append(rectangle)

//Step 4:
for p in (0 ..< oldPolylineArr.count) {
    oldPolylineArr[p].map = nil
}

is NOT Array

//Step 3:
oldPolyline = polyline

//Step 4:
oldPolyline.map = nil

Answer 2

Maybe a better solution: define your routePolyline as an optional variable then each time you want assign it a path, check it with if let... and set map to nil

if let routePolyline = routePolyline {
        routePolyline.map = nil
    }

// create new polyline
let path: GMSPath = GMSPath(fromEncodedPath: p)!
routePolyline = GMSPolyline(path: path)
routePolyline?.map = mapView