Detect tap on GMSPolyline in Swift?

Question

I'm struggling with detecting a tap on a GMSPolyline drawn on my Google map, it works just fine with GMSpolygones, but the same approach doesn't seem to work with polyline. My current approach, which works for polygones, is:

if (GMSGeometryContainsLocation(coordinate, polygon.path!, false)) {
    ...
}

Any suggestions how to detect taps on a polyline? Or just close to it?


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| swift   | ios   | google-maps   | polygon   | polyline   2016-11-22 19:11 2 Answers

Answers ( 2 )

  1. 2016-11-25 02:11

    According to their API documentation, GMSPolyline inherits from GMSOverlay which means a GMSPolyline has the property tappable. So you'd want something like this

    let polyLine: GMSPolyline = GMSPolyline(path: newPath)
    polyLine.isTappable = true
    polyline.map = yourGoogleMap
    

    Then your GMSMapViewDelegate should notify you of the tap anywhere within the GMSPolyline layer with this function

    func mapView(_ mapView: GMSMapView, didTap overlay: GMSOverlay)
    {
      print("User Tapped Layer: \(overlay)")
    }
    
  2. 2016-11-25 03:11

    You can use isTappable property of GMSPolyline.

    isTappable

    If this overlay should cause tap notifications.

    polyline.isTappable = true

    GMSPolyline inherits from GMSOverlay. So to detect tap on overlays GMSMapViewDelegate provides a delegate method:

    • mapView:didTapOverlay: Called after an overlay has been tapped.

    Whenever the polyline is tapped, the GMSMapViewDelegate method didTapOverlay is called

    func mapView(_ mapView: GMSMapView, didTap overlay: GMSOverlay) {
            //Write your code here
        }
    

    Also, this method can be used for GMSPolygon since it also inherits from GMSOverlay.

    For further information refer https://developers.google.com/maps/documentation/ios-sdk/reference/protocol_g_m_s_map_view_delegate-p.html#a3a2bf2ff4481528f931183cb364c0f4b

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