ios - Polyline won't show up in MapKit -

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i'm using xcode 8.3.2 first import mapkit. set markers map. add following code add polyline map won't show any.

class viewcontroller: uiviewcontroller, mkmapviewdelegate { @iboutlet weak var mapview: mkmapview!

    override func viewdidload() {      self.mapview.delegate = self     super.viewdidload()     let template = "http://tile.openstreetmap.org/{z}/{x}/{y}.png"         let point1 = cllocationcoordinate2d(latitude: 6.9271, longitude: 79.8612);         let point2 = cllocationcoordinate2d(latitude: 9.6615, longitude: 80.0255);              let overlay = mktileoverlay(urltemplate: template)             overlay.canreplacemapcontent = true             let location = cllocationcoordinate2dmake(6.878069, 79.892119)             mapview.add(overlay, level: .abovelabels)             mapview.setregion(mkcoordinateregionmakewithdistance(location, 1100, 1100), animated: true)             let pin = pinannotation(title: "nimbus", subtitle: "best", coordinate: location)             mapview.addannotation(pin)            let points: [cllocationcoordinate2d]         points = [point1, point2]          let polyline = mkgeodesicpolyline(coordinates: points, count: 3)         mapview.add(polyline)         uiview.animate(withduration: 1.5, animations: { () -> void in             let span = mkcoordinatespanmake(0.01, 0.01)             let region1 = mkcoordinateregion(center: point1, span: span)             self.mapview.setregion(region1, animated: true)         })        }  func mapview(_ mapview: mkmapview, rendererfor overlay: mkoverlay) ->mkoverlayrenderer{                     if let overlaygeodesic = overlay as? mkgeodesicpolyline                     {                         let overlayrenderer = mkpolylinerenderer(polyline: overlaygeodesic)                         overlayrenderer.linewidth = 5                         overlayrenderer.strokecolor = uicolor.blue                         return overlayrenderer                      }         return mkoverlayrenderer(overlay: overlay)                 }

first need add line, think have added anyway

    self.mapview.delegate = self

after need implement mkmapviewdelegate method func mapview(_ mapview: mkmapview, rendererfor overlay: mkoverlay) -> mkoverlayrenderer , return mkoverlayrenderer needed current overlay in case mkpolylinerenderer important part if don't implement method never have polyline rendered

implementation this

func mapview(_ mapview: mkmapview, rendererfor overlay: mkoverlay) -> mkoverlayrenderer {      if let overlaygeodesic = overlay as? mkgeodesicpolyline     {         let overlayrenderer = mkpolylinerenderer(polyline: overlaygeodesic)         overlayrenderer.linewidth = 5         overlayrenderer.strokecolor = uicolor.blue         return overlayrenderer     }      if let overlaytile = overlay as? mktileoverlay{         let overlayrenderer = mktileoverlayrenderer(tileoverlay: overlaytile)         return overlayrenderer     }     return mkoverlayrenderer(overlay: overlay) }

and voila! there polyline rendered

enter image description here





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