Remove GMSPolyline from GMSMapView

问题

I am using GoogleMap-IOS-1.8.1 SDK for showing map. I have to draw may GMSPolyline on map. After on a particular event i have to remove only all GMSPolyline, so how can i do that...? As GoogleMaps/documentation/ios say to use two method to do it.

 1. [mapView_ clear];
 2. Set your GMSPolyline's map property to nil

Here 1st approach remove all Marker and Overlay as well. which is i don't want. And for 2nd one i don't think that it is good way to save all poliline's reference. and then set it to nil. Is there any better way to do it....??

Here what i would like to do.

for (GMSPolyline *polylineToremove  in mapView_.polyline)
    {
      [mapView_ removeOverlay:overlayToRemove];
    }

回答1:

You do need to do as you've said - store a reference to all of the polylines you've added (eg in an array), and then loop over them and set their map property to nil.

回答2:

You just need to set GMSPolyline map property to nil.

GMSPolyline *polyline;
polyline.map = nil;

回答3:

This is code you need to remove any overlayView from GMSMapView. You can also do it with GMSMarkers, GMSPolyline.

for (GMSPolyline *polylineToRemove  in arrPolylineAdded){
      polylineToRemove.map = nil;
      polylineToRemove     = nil;
}

I have just checked :) for Google Map SDK Version 1.9.2.

回答4:

Just use below properly of Google Map:

mapView.clear()

Clears all markup that has been added to the map, including markers, polylines and ground

回答5:

Using Swift 3; Using this function first remove all polyline

import GoogleMaps

var polylineArray = [GMSPolyline]()


    for root: GMSPolyline in self.polylineArray
    {
        if root.userData as! String == "root"
        {
        root.map = nil
        }
    }

then drow again the polyline

func showPath(polyStr :String)
{
    let path = GMSPath(fromEncodedPath: polyStr)
    DispatchQueue.main.async 
    {
        let polyline = GMSPolyline(path: path)
        //MARK: remove the old polyline from the GoogleMap
        for root: GMSPolyline in self.polylineArray {
            if root.userData as! String == "root" {
               root.map = nil
            }
        }
        polyline.strokeWidth = 2.0
        polyline.strokeColor = sDefaultViewColorPrimaryDark
        polyline.userData = "root"
        polyline.map = self.mapView
        let bounds = GMSCoordinateBounds(path: path!)
        self.mapView!.animate(with: GMSCameraUpdate.fit(bounds,withPadding: 15.0))
        self.polylineArray.append(polyline)
        //self.mapView!.moveCamera(update)
    }
}

来源：https://stackoverflow.com/questions/25102778/remove-gmspolyline-from-gmsmapview