ios - MKMapView error and SFViewController error -

i error whenever try use mapview

"use of undeclared type of mkmapview"

and "use of undeclared type mkmapviewdelegate."

i error when trying call sfsafariviewcontroller.

for first two, code is

class pinviewcontroller: uiviewcontroller, uitextfielddelegate, mkmapviewdelegate {      @iboutlet weak var locationtextfield: uitextfield!     @iboutlet weak var addpinbtn: uibutton!     @iboutlet weak var linktextfield: uitextfield!     @iboutlet weak var mapview: mkmapview! 

the safari view controller code

@ibaction func signup(_ sender: anyobject) {          let url = nsurl(string:"https://www.udacity.com/account/auth#!/signup")         let safarivc = sfsafariviewcontroller(url: url as! url)         present(safarivc, animated: true, completion: nil) 

you need import mapkit framework access apple map related class , safari​services framework access sfsafariviewcontroller. add 2 import statement in pinviewcontroller

import mapkit import safari​services 

remember 1 ting batter if class name start capital latter, change pinviewcontroller pinviewcontroller