Swift / App Store : Problem with in app purchase - ios

Question

I have a problem with my app. My in app purchase work very well on my side, on ios 12,4 iphone 5s. But when I send the binary at Apple Store I have a return :"We noticed that your app still still does not display the purchase button for the In-App Purchase product, in the app.".The buy button is only displayed when the processing to pay is ready. About 2 to 3 seconds at home. But with them apparently it does not work at all ...
Here is the full code for my store that handles everything. And I specify that with my iphone I manage to have the purchase window and to buy the integrated purchase in sandbox.
import UIKit
import StoreKit
import MessageUI
class ShopViewController: UIViewController, SKProductsRequestDelegate, SKPaymentTransactionObserver, MFMailComposeViewControllerDelegate {
#IBOutlet weak var buyBtn: UIButton!
#IBOutlet weak var restore: UIButton!
#IBOutlet weak var mail: UIImageView!
#IBOutlet weak var shopDescription: UILabel!
var productsRequest = SKProductsRequest()
var validProducts = [SKProduct]()
var productIndex = 0
override func viewDidLoad() {
super.viewDidLoad()
buyBtn.isHidden = true
shopDescription.numberOfLines = 0
shopDescription.lineBreakMode = NSLineBreakMode.byWordWrapping
shopDescription.sizeToFit()
shopDescription.text = NSLocalizedString("packpro", comment: "")
// SKPaymentQueue.default().add(self)
let tap4 = UITapGestureRecognizer(target: self, action:#selector(tappedMe5))
mail.addGestureRecognizer(tap4)
mail.isUserInteractionEnabled = true
fetchAvailableProducts()
}
func fetchAvailableProducts() {
let productIdentifiers = NSSet(objects:
"customLifePremium" // 0
)
productsRequest = SKProductsRequest(productIdentifiers: productIdentifiers as! Set<String>)
productsRequest.delegate = self
productsRequest.start()
}
func productsRequest (_ request:SKProductsRequest, didReceive response:SKProductsResponse) {
if (response.products.count > 0) {
validProducts = response.products
let prod100coins = response.products[0] as SKProduct
print("1st rpoduct: " + prod100coins.localizedDescription)
buyBtn.isHidden = false
}
}
/* func paymentQueue(_ queue: SKPaymentQueue, shouldAddStorePayment payment: SKPayment, for product: SKProduct) -> Bool {
return true
}*/
func canMakePurchases() -> Bool { return SKPaymentQueue.canMakePayments() }
func purchaseMyProduct(_ product: SKProduct) {
if self.canMakePurchases() {
let payment = SKPayment(product: product)
SKPaymentQueue.default().add(self)
SKPaymentQueue.default().add(payment)
} else { print("Purchases are disabled in your device!") }
}
func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) {
for transaction:AnyObject in transactions {
if let trans:SKPaymentTransaction = transaction as? SKPaymentTransaction {
switch trans.transactionState {
case .purchased:
SKPaymentQueue.default().finishTransaction(transaction as! SKPaymentTransaction)
UserDefaults.standard.set(true, forKey: "premiumUser")
UserDefaults.standard.set(false, forKey: "limitedVersion")
break
case .failed:
SKPaymentQueue.default().finishTransaction(transaction as! SKPaymentTransaction)
print("Payment has failed.")
break
case .restored:
SKPaymentQueue.default().finishTransaction(transaction as! SKPaymentTransaction)
print("Purchase has been successfully restored!")
UserDefaults.standard.set(true, forKey: "premiumUser")
UserDefaults.standard.set(false, forKey: "limitedVersion")
break
default: break
}}}
}
func restorePurchase() {
SKPaymentQueue.default().add(self as SKPaymentTransactionObserver)
SKPaymentQueue.default().restoreCompletedTransactions()
}
func paymentQueueRestoreCompletedTransactionsFinished(_ queue: SKPaymentQueue) {
print("The Payment was successfull!")
}
override func viewWillAppear(_ animated: Bool) {
setGradientBackground()
super.viewWillAppear(animated)
}
#IBAction func restoreCC(_ sender: Any) {
restorePurchase()
}
#IBAction func buyCC(_ sender: Any) {
productIndex = 0
purchaseMyProduct(validProducts[productIndex])
}
#objc func tappedMe5()
{
if MFMailComposeViewController.canSendMail() {
let mail = MFMailComposeViewController()
mail.mailComposeDelegate = self
mail.setToRecipients(["dfmv.enterprise#gmail.com"])
mail.setSubject("")
mail.setMessageBody("", isHTML: true)
present(mail, animated: true)
}else{
let alert = UIAlertController(title: NSLocalizedString("info", comment: ""), message: NSLocalizedString("noClientMail", comment: ""), preferredStyle: UIAlertController.Style.alert)
alert.addAction(UIAlertAction(title: NSLocalizedString("ok", comment: ""), style: UIAlertAction.Style.default, handler: nil))
self.present(alert, animated: true, completion: nil)
}
}
func setGradientBackground() {
let colorTop = UIColor(red:1.00, green:0.30, blue:0.30, alpha:1.0).cgColor
let colorBottom = UIColor(red:1.00, green:0.69, blue:0.25, alpha:1.0).cgColor
let gradientLayer = CAGradientLayer()
gradientLayer.colors = [colorTop, colorBottom]
gradientLayer.locations = [0.0, 1.0]
gradientLayer.frame = self.view.bounds
self.view.layer.insertSublayer(gradientLayer, at:0)
}
}

Answer 1

Check this Gist that I personally used a week ago and passed the AppStore review for In-App Purchase flow.
IAP Service in Swift 5:
https://gist.github.com/egzonpllana/abd6d385bb45b1e329fe85a624ee531f
You can call IAPService.shared.getProducts() in AppDelegate method: didFinishLaunchingWithOptions to have all the products ready to use from your StoreKit in any viewcontroller, just check IAPService.shared.products.count.
Or call in your specific viewcontroller inside viewDidLoad and listen to changes with: IAPService.shared.didFinishRetrievingProducts = { [ weak self ] in ... }