ios - Common function for alert view? -


i want show alertview in controller classes. have created common function show alert & respond it's action buttons.

in commonfunctions.swift

i have created 1 function below 

 func showactionalertview(title:string,message:string,vc:uiviewcontroller) -> void {  let alert = uialertcontroller(title: "warning", message:  nslocalizedstring("alert_delete", comment: ""), preferredstyle: uialertcontrollerstyle.alert)  alert.addaction(uialertaction(title: "yes", style: .default, handler: { (action: uialertaction!) in   constant.commonfunction.showloader(withmessage: "loading")  }))  alert.addaction(uialertaction(title: "cancel", style: .cancel, handler: { (action: uialertaction!) in   print("handle cancel logic here") }))  vc.present(alert, animated: true, completion: nil) }

and created protocol in commonfunctions.swift.

protocol alertdelegate {   func okaction(controller:uiviewcontroller)   func cancelaction(controller:uiviewcontroller) }

in controller class have added

class 

mycontroller:uiviewcontroller,uitableviewdelegate,uitableviewdatasource,cllocationmanagerdelegate,alertdelegate {   var delegate:alertdelegate! = nil }

call functions goes here

 func okaction(controller: uiviewcontroller) {      print("ok action")    }   func cancelaction(controller: uiviewcontroller) {      print("cncel action")    }

and showing alert below 

  constant.commonfunction.showactionalertview(title: nslocalizedstring("success", comment: ""), message: nslocalizedstring("createproperty_alert_created", comment: ""), vc: self)

i not able call okaction & cancelaction methods. tell how implement call back.

yo need create object of delegate 

var delegate: alertdelegate?

and delegate can call functions

also need assign delegate self while calling method showactionalertview

like delegate = vc

alert.addaction(uialertaction(title: "yes", style: .default, handler: { (action: uialertaction!) in   constant.commonfunction.showloader(withmessage: "loading")       delegate?.okaction(controller: vc) }))  alert.addaction(uialertaction(title: "cancel", style: .cancel, handler: { (action: uialertaction!) in   print("handle cancel logic here")   // call delegate cancel action here     delegate?.cancelaction(controller: vc) }))

edited

do 

class utility : nsobject {  var delegate: alertdelegate?  func showactionalertview(title:string,message:string,vc:uiviewcontroller) -> void {     let alert = uialertcontroller(title: "warning", message:  nslocalizedstring("alert_delete", comment: ""), preferredstyle: uialertcontrollerstyle.alert)      alert.addaction(uialertaction(title: "yes", style: .default, handler: { (action: uialertaction!) in         self.delegate?.okaction(controller: vc)      }))      alert.addaction(uialertaction(title: "cancel", style: .cancel, handler: { (action: uialertaction!) in         print("handle cancel logic here")         self.delegate?.cancelaction(controller: vc)     }))      vc.present(alert, animated: true, completion: nil) } }

and use 

func showalert() {     let vcutility = utility()     vcutility.delegate = self     vcutility.showactionalertview(title: "message", message: "message", vc: self)  }  func okaction(controller: uiviewcontroller) {     print("ok") } func cancelaction(controller: uiviewcontroller) {     print("cancel") }

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