iOS - Swift - How to add a button to MKPointAnnotaton - MapKit -

currently have map view set 5 hardcoded locations shown on map pins. when user clicks on these pins callout show user has details of location. within these callouts trying include button user can press , takes them view controller.

below current code have, when tap on pins no button shown, have idea missing or need in order implement button?

here code locations , current user location.

import uikit import mapkit import corelocation import scenekit  class secondviewcontroller: uiviewcontroller, mkmapviewdelegate, cllocationmanagerdelegate {     @iboutlet weak var mapview: mkmapview!  //location manager property let locationmanager = cllocationmanager()  override func viewdidload() {     super.viewdidload()      mapview.delegate = self      //find current location view loaded     self.locationmanager.delegate = self      //setting accuracy     self.locationmanager.desiredaccuracy = kcllocationaccuracybest      //so location services used within app     self.locationmanager.requestwheninuseauthorization()      //start location manager , find current location     self.locationmanager.startupdatinglocation()      //use blue pin show location user     self.mapview.showsuserlocation = true      //array of dictionaries store locations     let locationdata = [          //radio city tower         ["name": "radio city tower",         "latitude": 53.4071551,         "longitude": -2.980798600000071],          //metropolitian cathedral         ["name": "metropolitian catherdral",          "latitude": 53.40494649999999,          "longitude": -2.9684022999999797],          //walker art gallery         ["name": "walker art gallery",             "latitude": 53.410068,             "longitude": -2.979666],          //liver buildings         ["name": "liver buildings",             "latitude": 53.405808,             "longitude": -2.995859],          //st george's hall         ["name": "st george's hall",             "latitude": 53.409277,             "longitude": -2.979946]     ]      //object each dictionary in locations array     var annotations = [mkpointannotation]()      //populating map location pins     dictionary in locationdata {         let latitude = cllocationdegrees(dictionary["latitude"] as! double)         let longitude = cllocationdegrees(dictionary["longitude"] as! double)         let coordinate = cllocationcoordinate2d(latitude: latitude, longitude: longitude)         let name = dictionary["name"] as! string         let annotation = mkpointannotation()          //apply annotation         annotation.coordinate = coordinate         annotation.title = "\(name)"         annotations.append(annotation)       }      mapview.addannotations(annotations)  }  override func didreceivememorywarning() {     super.didreceivememorywarning()     // dispose of resources can recreated. }  // mark: - location delegate methods  func locationmanager(manager: cllocationmanager, didupdatelocations locations: [cllocation]) {     //gets current location     let location = locations.last       //gets center of last location     let center = cllocationcoordinate2d(latitude: location!.coordinate.latitude, longitude: location!.coordinate.longitude)      //creatng region - map zoom     let region = mkcoordinateregion(center: center, span: mkcoordinatespan(latitudedelta: double(0.004), longitudedelta: double(0.004)))      //apply map view region     self.mapview.setregion(region, animated: true)      //stop updating location     self.locationmanager.stopupdatinglocation()      let currentlocation = cllocationcoordinate2dmake(location!.coordinate.latitude, location!.coordinate.longitude)      //adding annotation current user location     var pinannotation = mkpointannotation()      //set pin coordinate users current location     pinannotation.coordinate = currentlocation      //annotation title     pinannotation.title = "current location"      //annotation subtitle     pinannotation.subtitle = "you here!"      //add pin mapview     mapview.addannotation(pinannotation)  } 

and here code button implementation within callout(does not work)

    func mapview(mapview: mkmapview!, annotationview view: mkannotationview!, calloutaccessorytapped control: uicontrol!) {     if control == view.rightcalloutaccessoryview {         print(view.annotation?.title)         print(view.annotation?.subtitle)          //perform segue navigate viewcontroller     } }  func mapview(mapview: mkmapview!, viewforannotation annotation: mkannotation!) -> mkannotationview! {     print("viewforannotation")     if(annotation mkuserlocation) {         return nil     }      let reuseid = "pin"     var pinview = mapview.dequeuereusableannotationviewwithidentifier(reuseid) as? mkpinannotationview      if(pinview == nil) {         pinview = mkpinannotationview(annotation: annotation, reuseidentifier: reuseid)         pinview!.canshowcallout = true         pinview!.animatesdrop = true     }      var button = uibutton(type: .detaildisclosure) uibutton      pinview?.rightcalloutaccessoryview = button      return pinview  } 

i missing simple not sure what. new ios/swift development , mapkit please bear me. understand question has been asked multiple times however, still unable solve this. appreciated, thank you.

you making small mistake in following callout method explicitly unwrapped mkannotationview! , mkmapview!. here corrected 1 have tested it.

func mapview(mapview: mkmapview, viewforannotation annotation: mkannotation) -> mkannotationview? {     print("viewforannotation")     if(annotation mkuserlocation) {         return nil     }     let reuseid = "pin"     var pinview = mapview.dequeuereusableannotationviewwithidentifier(reuseid) as? mkpinannotationview     if(pinview == nil) {         pinview = mkpinannotationview(annotation: annotation, reuseidentifier: reuseid)         pinview!.canshowcallout = true         pinview!.animatesdrop = true     }     let button = uibutton()     button.frame = cgrect(x: 0, y: 0, width: 30, height: 30)     let image = uiimage(named: "img.png")     button.setimage(image, forstate: .normal)     pinview?.rightcalloutaccessoryview = button     return pinview }