ios - MapKit - Change the Color/Stroke of a MKPolyline -

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i have added overlay map follwing code:

func mapview(mapview: mkmapview!, rendererforoverlay overlay: mkoverlay!) -> mkoverlayrenderer! {     if overlay.iskindofclass(mkpolyline) {         // draw track          let polyline = overlay as! mkpolyline         let polylinerenderer = mkpolylinerenderer(overlay: polyline)         polylinerenderer.strokecolor = uicolor.bluecolor()         polylinerenderer.linewidth = 2.0         return polylinerenderer     }      return nil }

now want change color or line width of polyline.
way found is:

func randommethod() {     ...// find apolyline     self.myoverlay = apolyline     self.map.removeoverlay(self.myoverlay)     self.map.addoverlay(self.myoverlay) }

on mapview renderforoverlay method added this: 

if (polyline == self.myoverlay) {    polylinerenderer.strokecolor = uicolor.redcolor()    polylinerenderer.linewidth = 5.0 }else{    polylinerenderer.strokecolor = uicolor.bluecolor()    polylinerenderer.linewidth = 2.0  }

there has better way removing overlay , adding back.
know other way?

i don't think best solution found way of doing without removing/adding overlay.

i keep reference let polylinerenderer = mkpolylinerenderer(overlay: polyline) way on randommethod() can change properties need (stroke, linewidth) , execute setneedsdisplay() on renderer polyline.

is worst other approach? may be.. have add structure store renderers, way found...


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