ios - I cannot get my MKRoute to show up on a MapView. I'm very stuck -

i trying add mkoverlay (my mkroute) mapview, cannot figure out doing wrong. pretty sloppy because i'm experimenting before implement in app.

here's code:

import uikit import mapkit import corelocation  class viewcontroller: uiviewcontroller, mkmapviewdelegate, cllocationmanagerdelegate {      @iboutlet var map: mkmapview!      var geocoder:clgeocoder = clgeocoder()     var location:cllocation = cllocation(latitude: 38, longitude: -77)     var next:cllocation = cllocation(latitude: 38.9, longitude: -77.61)     var locmark:mkplacemark?     var destmark:mkplacemark?     var manager:cllocationmanager = cllocationmanager()     var source:mkmapitem?     var destination:mkmapitem?     var request:mkdirectionsrequest = mkdirectionsrequest()     var directions:mkdirections = mkdirections()     var directionsresponse:mkdirectionsresponse = mkdirectionsresponse()     var route:mkroute! = mkroute()      override func viewdidload() {         super.viewdidload()          self.map.delegate = self         manager.requestalwaysauthorization()          let latdelt = 0.05         let londelt = 0.05          let span:mkcoordinatespan = mkcoordinatespan(latitudedelta: latdelt, longitudedelta: londelt)         let region:mkcoordinateregion = mkcoordinateregion(center: cllocationcoordinate2dmake(location.coordinate.latitude, location.coordinate.longitude), span: span)         map.setregion(region, animated: true)           map.maptype = mkmaptype.satellite           locmark = mkplacemark(coordinate: cllocationcoordinate2dmake(location.coordinate.latitude, location.coordinate.longitude), addressdictionary: nil)         destmark = mkplacemark(coordinate: cllocationcoordinate2dmake(next.coordinate.latitude, next.coordinate.longitude), addressdictionary: nil)          source = mkmapitem(placemark: locmark)         destination = mkmapitem(placemark: destmark)          request.setsource(source)         request.setdestination(destination)         request.transporttype = mkdirectionstransporttype.automobile         request.requestsalternateroutes = true          let directions = mkdirections(request: request)          directions.calculatedirectionswithcompletionhandler { (response:mkdirectionsresponse?, error:nserror?) -> void in              if error == nil {                 self.directionsresponse = response!                 self.route = self.directionsresponse.routes[0] as! mkroute                 self.map.addoverlay(self.route.polyline)             } else {                 println(error)             }         }          func mapview(mapview: mkmapview!, rendererforoverlay overlay: mkoverlay!) -> mkoverlayrenderer! {              if overlay mkpolyline {                 var pr = mkpolylinerenderer(overlay: overlay)                 pr.strokecolor = uicolor.purplecolor()                 pr.linewidth = 5                 return pr             }             return nil         }     } 

i don't errors printed, not route shows on map @ all. i've been struggling 4 days now.

the problem rendererforoverlay function nested inside viewdidload:

override func viewdidload() {     //your viewdidload code here...      //rendererforoverlay declared here inside viewdidload...     func mapview(mapview: mkmapview!, rendererforoverlay overlay: mkoverlay!) -> mkoverlayrenderer! {         ...     }  }  // <-- closing brace of viewdidload 

because of this, rendererforoverlay function hidden map view , not call resulting in no overlay displaying.

to fix this, move rendererforoverlay function outside viewdidload it's visible rest of class:

override func viewdidload() {     //your viewdidload code here...  }  // <-- closing brace of viewdidload  //put rendererforoverlay here outside viewdidload... func mapview(mapview: mkmapview!, rendererforoverlay overlay: mkoverlay!) -> mkoverlayrenderer! {     ... }