annotations - Users location (blue dot) keeps turning into red pin -

i have users location blue dot while having pins on mapview. pins have annotation has info button. can blue dot users location , enable pins have annotation such title subtitle. when go add info button red pins users location (blue dot) turns red pin.

i can't seem spot i'm going wrong. has last function because function puts info button onto annotation. selects users current location , turns pin reason :(

 class gettothestart: uiviewcontroller, mkmapviewdelegate, cllocationmanagerdelegate {  @iboutlet weak var mapview: mkmapview!     let mylocmgr = cllocationmanager()       override func viewdidload() {     super.viewdidload()       mylocmgr.desiredaccuracy = kcllocationaccuracybest     mylocmgr.requestwheninuseauthorization()     mylocmgr.startupdatinglocation()     mylocmgr.delegate = self         mapview.delegate = self     var zoo = cllocationcoordinate2dmake(53.3562, -6.3053)      var zoopin = mkpointannotation()     zoopin.coordinate = zoo     zoopin.title = "dublin zoo"     zoopin.subtitle = "hello zoo"     mapview.addannotation(zoopin)     }        func locationmanager(manager: cllocationmanager, didupdatelocations locations: [cllocation]) {      // recient coordinate     let mycoor = locations[locations.count - 1]      //get lat & long     let mylat = mycoor.coordinate.latitude     let mylong = mycoor.coordinate.longitude     let mycoor2d = cllocationcoordinate2d(latitude: mylat, longitude: mylong)      //set span     let mylatdelta = 0.05     let mylongdelta = 0.05     let myspan = mkcoordinatespan(latitudedelta: mylatdelta, longitudedelta: mylongdelta)      let myregion = mkcoordinateregion(center: mycoor2d, span: myspan)      self.mapview.showsuserlocation = true             }          func mapview(mapview: mkmapview, viewforannotation annotation: mkannotation) -> mkannotationview? {     let reuseidentifier = "pin"     var pin =       mapview.dequeuereusableannotationviewwithidentifier(reuseidentifier) as? mkpinannotationview     if pin == nil {         pin = mkpinannotationview(annotation: annotation, reuseidentifier: reuseidentifier)         pin!.pincolor = .red         pin!.canshowcallout = true         pin!.rightcalloutaccessoryview = uibutton(type: .detaildisclosure)     } else {         pin!.annotation = annotation     }     return pin } 

viewforannotation delegate method called annotation on map including userlocation.

so check , return nil shown below...

func mapview(mapview: mkmapview, viewforannotation annotation: mkannotation) -> mkannotationview? {       if annotation mkuserlocation {     //return nil map view draws "blue dot" standard user location         return nil     }     let reuseidentifier = "pin"     var pin = mapview.dequeuereusableannotationviewwithidentifier(reuseidentifier) as? mkpinannotationview     if pin == nil {         pin = mkpinannotationview(annotation: annotation, reuseidentifier: reuseidentifier)         pin!.pincolor = .red         pin!.canshowcallout = true         pin!.rightcalloutaccessoryview = uibutton(type: .detaildisclosure)      } else {         pin!.annotation = annotation      }      return pin }