ios - Type 'MapViewController' has no member 'mapTypeChanged' Swift Big Nerd Ranch Guide -


[type 'mapviewcontroller' has no member 'maptypechanged'][2] in line:

action: #selector(mapviewcontroller.maptypechanged(_:)),

there method maptypechanged @ bottom of code, i'm unsure why error says there no member maptypechanged ? i'm guessing maptypechanged needs declared variable (global?) 

import uikit import mapkit   class mapviewcontroller: uiviewcontroller {      var mapview: mkmapview!      override func loadview() {          mapview = mkmapview()         view = mapview          let segmentedcontrol             = uisegmentedcontrol(items: ["standard", "hybrid", "satellite"])         segmentedcontrol.backgroundcolor             = uicolor.white.withalphacomponent(0.5)         segmentedcontrol.selectedsegmentindex = 0          segmentedcontrol.addtarget(self,                                    action: #selector(mapviewcontroller.maptypechanged(_:)),                                    for: .valuechanged) segmentedcontrol.translatesautoresizingmaskintoconstraints = false         view.addsubview(segmentedcontrol)          let topconstraint             = segmentedcontrol.topanchor.constraint(equalto: toplayoutguide.bottomanchor, constant: 8)         let margins = view.layoutmarginsguide         let leadingconstraint =             segmentedcontrol.leadinganchor.constraint(equalto: margins.leadinganchor)         let trailingconstraint =             segmentedcontrol.trailinganchor.constraint(equalto: margins.trailinganchor)          topconstraint.isactive = true         leadingconstraint.isactive = true         trailingconstraint.isactive = true          func maptypechanged(_segcontrol: uisegmentedcontrol) {             switch _segcontrol.selectedsegmentindex {             case 0:                 mapview.maptype = .standard             case 1:                 mapview.maptype = .hybrid             case 2:                 mapview.maptype = .satellite             default:                 break             }         }     }       override func viewdidload() {         super.viewdidload()          print("mapviewcontroller loaded view.")      }  } 

#selector(mapviewcontroller.maptypechanged(_:))

means "call maptypechanged method".

so need implement maptypechanged.

func maptypechanged(_ sender: uisegmentedcontrol) {     print(sender.selectedsegmentindex) }

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