How to unlock UITabbar after app purchase has been made in swift - swift

Question

I'm new to asking questions.
I need help in creating a feature of the app which is to unlock the tabbar when a purchase is made.
I used this code to lock my tabbar which is in the override func viewDidLoad()
I would really appreciate if someone could sort this out for me! I have been researching all day with no answers. Thanks!
if let arrayOfTabBarItems = tabBarController?.tabBar.items as AnyObject as? NSArray,let tabBarItem1 = arrayOfTabBarItems[0] as? UITabBarItem {
tabBarItem1.isEnabled = true
}
if let arrayOfTabBarItems = tabBarController?.tabBar.items as AnyObject as? NSArray,let tabBarItem2 = arrayOfTabBarItems[1] as? UITabBarItem {
if nonConsumablePurchaseMade == true {
tabBarItem2.isEnabled = true
print("done")
} else
{
tabBarItem2.isEnabled = false
print("failed")
}
}
if let arrayOfTabBarItems = tabBarController?.tabBar.items as AnyObject as? NSArray,let tabBarItem3 = arrayOfTabBarItems[2] as? UITabBarItem {
tabBarItem3.isEnabled = false
}
if let arrayOfTabBarItems = tabBarController?.tabBar.items as AnyObject as? NSArray,let tabBarItem4 = arrayOfTabBarItems[3] as? UITabBarItem {
tabBarItem4.isEnabled = false
}
and this might help. They are the functions for the purchases.
func purchaseProduct(with id: String){
SwiftyStoreKit.retrieveProductsInfo([id]) { result in
if let product = result.retrievedProducts.first {
SwiftyStoreKit.purchaseProduct(product, quantity: 1, atomically: true) { result in
switch result {
case .success(let product):
// fetch content from your server, then:
if product.needsFinishTransaction {
SwiftyStoreKit.finishTransaction(product.transaction)
}
case .error(let error):
switch error.code {
case .unknown: print("Unknown error. Please contact support")
case .clientInvalid: print("Not allowed to make the payment")
case .paymentCancelled: break
case .paymentInvalid: print("The purchase identifier was invalid")
case .paymentNotAllowed: print("The device is not allowed to make the payment")
case .storeProductNotAvailable: print("The product is not available in the current storefront")
case .cloudServicePermissionDenied: print("Access to cloud service information is not allowed")
case .cloudServiceNetworkConnectionFailed: print("Could not connect to the network")
case .cloudServiceRevoked: print("User has revoked permission to use this cloud service")
}
}
}
}
}
}
func verifyPurchase(with id: String , sharedSecret: String) {
let appleValidator = AppleReceiptValidator(service: .production, sharedSecret: sharedSecret)
SwiftyStoreKit.verifyReceipt(using: appleValidator) { result in
switch result {
case .success(let receipt):
let productId = "myID"
// Verify the purchase of Consumable or NonConsumable
let purchaseResult = SwiftyStoreKit.verifyPurchase(
productId: id,
inReceipt: receipt)
switch purchaseResult {
case .purchased(let receiptItem):
print("\(productId) is purchased: \(receiptItem)")
if self.product_ID == self.productId {
// Save your purchase locally (needed only for Non-Consumable IAP)
self.nonConsumablePurchaseMade = true
UserDefaults.standard.set(self.nonConsumablePurchaseMade, forKey: "nonConsumablePurchaseMade")
}
case .notPurchased:
print("The user has never purchased \(productId)")
}
case .error(let error):
print("Receipt verification failed: \(error)")
}
}
}
#objc func returnTextView(gesture: UIGestureRecognizer) {
guard activeField != nil else {
return
}
activeField?.resignFirstResponder()
activeField = nil
}