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I am using RealmSwift to create a pin code object for an iOS app I am building.
I have created a constructor and a few basic functions to check the pin, enter new pin, etc.
I can set a new pin using the pin object created in RealmSwift, but I am having problems checking it.
Here is the RealmSwift part:

import Foundation
import RealmSwift

class pinCode: Object 
@objc dynamic var pin = ""


protocol pinCodeManager 
func checkForExistingPin() -> Bool
func enterNewPin(newPin:String)
func checkPin(pin:String) -> Bool


class manager:pinCodeManager 
 let realm = try! Realm()

func checkForExistingPin() -> Bool 

 let existingCode = realm.objects(pinCode.self)
 if existingCode.count == 0 
 return false
 
 else 
 return true
 


func enterNewPin(newPin:String) 
 if checkForExistingPin() 
 let oldCode = realm.objects(pinCode.self).first
 try! realm.write 
 oldCode!.pin = newPin
 
 
 let newPinObject = pinCode()
 newPinObject.pin = newPin
 realm.add(newPinObject)


func checkPin(pin:String) -> Bool 
 if checkForExistingPin() 
 if pin == realm.objects(pinCode.self).first?.pin 
 return true
 
 else 
 return false
 
 
 return false
 

Here is the ViewController part

import UIKit

class InitialViewController: UIViewController {
var currentPinCode = ""
var pinEntered = ""
var firstPinEntered = ""
var secondPinEntered = ""
let myPin = pinCode()

@IBOutlet weak var enterPinCodeField: UITextField!

@IBAction func GoButton(_ sender: Any) 
 let enteredPin = enterPinCodeField?.text
 if self.myPin.checkPin(pin: enteredPin) 
 print ("Correct Pin")
 
 else 
 print ("Incorrect Pin")
 


@IBAction func NewUserButton(_ sender: Any) 
 print ("New user selected!")

 let pinCodeAlert = UIAlertController(title: "Enter New PIN", message: "", preferredStyle: .alert)
 pinCodeAlert.addTextField (configurationHandler:textField1 in

 textField1.keyboardType = .numberPad
 textField1.placeholder = "Enter new PIN"
 textField1.isSecureTextEntry = true
 )

 let okAction = UIAlertAction(title: "OK", style: .cancel) (action) in
 let firstPinEntry = pinCodeAlert.textFields?.first
 print ("First PIN entered: " , firstPinEntry!.text)
 self.confirmPin(firstPin: firstPinEntry!.text!)
 

 pinCodeAlert.addAction(okAction)
 self.present(pinCodeAlert, animated: true, completion: nil)



func confirmPin(firstPin: String) 
 let pinCodeAlert2 = UIAlertController(title: "Re-enter New PIN", message: "", preferredStyle: .alert)
 pinCodeAlert2.addTextField (configurationHandler:textField1 in

 textField1.keyboardType = .numberPad
 textField1.placeholder = "Re-enter new PIN"
 textField1.isSecureTextEntry = true


 )
 let okAction2 = UIAlertAction(title: "OK", style: .cancel) (action) in
 let secondPinEntered = pinCodeAlert2.textFields?.first
 print ("2nd PIN entered: " , secondPinEntered?.text! as Any)

 if firstPin != secondPinEntered?.text! 
 print("PINs dont match!")
 let pinCodesDontMatch = UIAlertController(title: "PINs don't match!", message: "", preferredStyle: .alert)


 let okAction3 = UIAlertAction(title: "OK", style: .cancel) (action) in
 
 pinCodesDontMatch.addAction(okAction3)
 self.present(pinCodesDontMatch, animated: true, completion: nil)
 
 else 
 let newPinSet = UIAlertController(title: "New PIN Set", message: "", preferredStyle: .alert)
 let okAction = UIAlertAction(title: "OK", style: .cancel) (action) in
 
 newPinSet.addAction(okAction)
 self.present(newPinSet, animated: true, completion: nil)
 self.myPin.pin = String((secondPinEntered?.text)!)
 
 


 pinCodeAlert2.addAction(okAction2)
 self.present(pinCodeAlert2, animated: true, completion: nil)


@IBOutlet weak var PinCodeField: UITextField!
override func viewDidLoad() 
 super.viewDidLoad()

 // Do any additional setup after loading the view.


override func didReceiveMemoryWarning() 
 super.didReceiveMemoryWarning()
 // Dispose of any resources that can be recreated.

The line I am having problems with is:

 if self.myPin.checkPin(pin: enteredPin)

I have tried a few variations on it without any success.

The error I get is "Value of type 'pinCode' has no member 'checkPin'"
So I get the impression that it is looking for a member rather than a function called checkPin.

How do I tell it that I'm trying to point it to a function?

Your checkPin function has been declared for the pinCodeManager class, but you are trying to call the function for a pinCode object. You need to create a pinCodeManager instance to call checkPin.