GMSMapView not showing polyline while used as subview

Question

I am using GMSMapview to display the polyline. If I use self.view it's worked perfect.

 let camera = GMSCameraPosition.camera(withLatitude: 0, longitude:-165, zoom:2)
            let mapView = GMSMapView.map(withFrame: self.gMap.bounds, camera:camera)

            let path = GMSMutablePath()
            path.addLatitude(-33.866, longitude:151.195) // Sydney
            path.addLatitude(-18.142, longitude:178.431) // Fiji
            path.addLatitude(21.291, longitude:-157.821) // Hawaii
            path.addLatitude(37.423, longitude:-122.091) // Mountain View

            let polyline = GMSPolyline(path: path)
            polyline.strokeColor = UIColor.blue
            polyline.strokeWidth = 5.0
            polyline.map = mapView

            self.gMap.isHidden = true
            self.view = mapView

But while I used GMSMapView as subview to display the polyline it's not getting updated.

@IBOutlet weak var gMap: GMSMapView!

            let camera = GMSCameraPosition.camera(withLatitude: 0, longitude:-165, zoom:2)
            let mapView = GMSMapView.map(withFrame: self.gMap.bounds, camera:camera)

            let path = GMSMutablePath()
            path.addLatitude(-33.866, longitude:151.195) // Sydney
            path.addLatitude(-18.142, longitude:178.431) // Fiji
            path.addLatitude(21.291, longitude:-157.821) // Hawaii
            path.addLatitude(37.423, longitude:-122.091) // Mountain View

            let polyline = GMSPolyline(path: path)
            polyline.strokeColor = UIColor.blue
            polyline.strokeWidth = 5.0
            polyline.map = mapView

            //self.gMap.isHidden = true
            self.gMap = mapView

Why you don't simply do this `polyline.map = self.gMap` and why you create a mapView from code when you have one added as Outlet? — Reinier Melian, Nov 22 '16 at 19:14

score 0 · Answer 1 · answered Dec 12 '16 at 22:45

Are you sure the GMSMapView is fully loaded when you are setting map to polyline?

Implement GMSMapViewDelegate method and do the same, I am sure you would be able to see.

/**
 * Called when all tiles have been loaded (or failed permanently) and labels have been rendered.
 */
optional public func mapViewDidFinishTileRendering(mapView: GMSMapView!)

GMSMapView not showing polyline while used as subview

1 Answers1