Xcode ViewController shows Cannot find 'pay' in scope - ios

Question

I am trying to link my iOS app to stripe, but in my viewcontroller it shows error - "Cannot find 'pay' in scope"
Attaching the screenshot of the error -
My ViewController is -
import UIKit
import Stripe
import Alamofire
class ViewController: UIViewController {
// Mark UIViews
var productStackView = UIStackView()
var paymentStackView = UIStackView()
var paymentTextField = STPPaymentCardTextField()
var productImageView = UIImageView()
var productLabel = UILabel()
var payButton = UIButton()
var loadingSpinner = UIActivityIndicatorView()
var outputTextView = UITextView()
override func viewDidLoad() {
super.viewDidLoad()
self.setupUI()
}
func setupUI() {
setupProductImage()
setupProductLabel()
setupLoadingSpinner()
setupPaymentTextFiled()
setupPayButton()
setupOutputTextView()
self.productStackView.frame = CGRect(x: 0, y: 70, width: 330, height: 150)
self.productStackView.center.x = self.view.center.x
self.productStackView.alignment = .center
self.productStackView.axis = .vertical
self.productStackView.distribution = .equalSpacing
self.productStackView.addArrangedSubview(self.productImageView)
self.productStackView.setCustomSpacing(10, after: self.productImageView)
self.productStackView.addArrangedSubview(self.productLabel)
self.view.addSubview(self.productStackView)
self.paymentStackView.frame = CGRect(x:0, y: 250, width: 300, height: 100)
self.paymentStackView.center.x = self.view.center.x
self.paymentStackView.alignment = .fill
self.paymentStackView.axis = .vertical
self.paymentStackView.distribution = .equalSpacing
self.paymentStackView.addArrangedSubview(self.paymentTextField)
self.paymentStackView.addArrangedSubview(self.payButton)
self.view.addSubview(self.paymentStackView)
}
func setupProductImage(){
self.productImageView = UIImageView(frame: CGRect(x: 50, y: 50, width: 275, height: 200))
self.productImageView.image = UIImage(named: "stripe press")
self.productImageView.contentMode = .scaleAspectFit
}
func setupProductLabel() {
self.productLabel.frame = CGRect(x: 0, y: 420, width: self.view.frame.width, height: 50)
}
func setupOutputTextView() {
self.outputTextView.frame = CGRect(x: 0, y: 420, width: self.view.frame.width - 50, height: 100)
self.outputTextView.center.x = self.view.center.x
self.outputTextView.textAlignment = .left
self.outputTextView.font = UIFont.systemFont(ofSize: 18)
self.outputTextView.text = ""
self.outputTextView.layer.borderColor = UIColor.purple.cgColor
self.outputTextView.isEditable = false
self.view.addSubview(self.outputTextView)
}
func setupPaymentTextFiled() {
self.paymentTextField.frame = CGRect(x: 0, y: 0, width: 330, height: 660)
}
func setupPayButton() {
self.payButton.frame = CGRect(x: 60, y: 480, width: 150, height: 40)
self.payButton.setTitle("Submit Payment", for: .normal)
self.payButton.setTitleColor(UIColor.white, for: .normal)
self.payButton.layer.cornerRadius = 5.0
self.payButton.backgroundColor = UIColor.init(red:50/255,green: 50/255,blue: 93/255, alpha:1.0)
self.payButton.layer.borderWidth = 1.0
self.payButton.addTarget(self, action: #selector(pay), for: .touchUpInside)
}***/* ERROR -Cannot find 'pay' in scope */***
func setupLoadingSpinner() {
self.loadingSpinner.color = UIColor.darkGray
self.loadingSpinner.frame = CGRect(x: 0, y: 300, width: 25, height: 25)
self.loadingSpinner.center.x = self.view.center.x
self.view.addSubview(self.loadingSpinner)
}
func startLoading() {
DispatchQueue.main.async {
self.loadingSpinner.startAnimating()
self.loadingSpinner.isHidden = false
}
}
func stopLoading() {
DispatchQueue.main.async {
self.loadingSpinner.stopAnimating()
self.loadingSpinner.isHidden = true
}
}
func diplayStatus (_ message:String) {
DispatchQueue.main.async {
self.outputTextView.text += message + " \n"
self.outputTextView.scrollRangeToVisible(NSMakeRange(self.outputTextView.text.count - 1, 1))
}
}
}
I have boldened the error in the above code.
As mentioned i have also attached the sreenshot.
I tried everything but could not figure a way round it. How to sort-it-out ?

Answer 1

The selector should be an Objc function that you want to run when the user taps the pay button.
#objc func pay() {
//Your pay code goes in here
}

Answer 2

Yes, you guys were right, I added " #objc func pay() {}" as follows ane everything worked fine:-
.......func diplayStatus (_ message:String) {
DispatchQueue.main.async {
self.outputTextView.text += message + " \n"
self.outputTextView.scrollRangeToVisible(NSMakeRange(self.outputTextView.text.count - 1, 1))
}
}
#objc func pay() {} //here
}