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 wor

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