In-App Purchase Swift - ios

Question

I am using IAPHelper to implement in-app purchase, an error is occurring when I go to another view controller after pressing the purchase button. For instance, when I press the purchase button then go to another view controller the error is presented after finishing the purchase work.
class selectQuestion_ViewController: UITableViewController, UITableViewDelegate, UITableViewDataSource{
let helper = IAPHelper(productIdentifiers: NSSet(object: "sppid") as Set<NSObject>)
func purchase(sender: AnyObject)
{
startLoading("Purchasing ..")
self.helper.requestProductsWithCompletionHandler({ (success, products) -> Void in
if success {
self.endLoading()
println("wohooooo")
var sdad = self.helper.productsDict["sppid"]
self.helper.buyProduct(sdad!)
} else {
self.endLoading()
let alert = UIAlertController(title: "Error", message: "Cannot retrieve products list right now.", preferredStyle: .Alert)
alert.addAction(UIAlertAction(title: "OK", style: .Default, handler: nil))
self.presentViewController(alert, animated: true, completion: nil)
}
})
}

Answer 1

I recommend you do not use such modules. It would be much better for you and your understanding of IAPs that you check this tutorial and implement the code and methods described there: https://www.youtube.com/watch?v=h1gQklbrgjc
Once you have implemented that code, if something doesn't work (you may have forgotten a line somewhere), come back to SO and we will gladly help you out. Already, as quick help, here is an answer that could help you with most errors once you implement your IAP code with something else than IAP helper: My IAP isn't working. Bugs at func Paymentqueue
In fact, you can watch the video and copy paste the code of my question. My IAP code works ;) Will save you time. But watch the video to understand how to implement IAPs !
I hope this answer helped you ;)
Here is the full IAP code :
import UIKit
import StoreKit
class GameViewController: UIViewController, ADBannerViewDelegate, SKProductsRequestDelegate, SKPaymentTransactionObserver, GKGameCenterControllerDelegate,GADBannerViewDelegate{
#IBOutlet var outRemoveAds: UIButton!
#IBOutlet var outRestorePurchases: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
if NSUserDefaults.standardUserDefaults().objectForKey("val") != nil {
print("Has a value.")
banner.removeFromSuperview()
bannerGoogle.removeFromSuperview()
outRemoveAds.removeFromSuperview()
outRestorePurchases.removeFromSuperview()
removeInterFrom = 1
}
else {
print("No Value.")
}
if(SKPaymentQueue.canMakePayments()){
print("IAP is enabled, loading...")
let productID:NSSet = NSSet(objects:"IAP id")
let request: SKProductsRequest = SKProductsRequest(productIdentifiers: productID as! Set<String>)
request.delegate = self
request.start()
}
else{
print("Please enable IAPS")
}
}
//IAP Ads
#IBAction func removeAds(sender: UIButton) {
for product in list{
let prodID = product.productIdentifier
if (prodID == "IAP id"){
p = product
buyProduct()
break
}
}
}
#IBAction func restorePurchases(sender: UIButton) {
SKPaymentQueue.defaultQueue().restoreCompletedTransactions()
}
//IAP Functions
var list = [SKProduct]()
var p = SKProduct()
func removeAds(){
banner.removeFromSuperview()
bannerGoogle.removeFromSuperview()
outRemoveAds.removeFromSuperview()
outRestorePurchases.removeFromSuperview()
let theValue = 10
NSUserDefaults.standardUserDefaults().setObject(theValue, forKey: "val")
NSUserDefaults.standardUserDefaults().synchronize()
}
func buyProduct(){
print("Buy: "+p.productIdentifier)
let pay = SKPayment (product: p)
SKPaymentQueue.defaultQueue().addPayment(pay as SKPayment)
}
func productsRequest(request: SKProductsRequest, didReceiveResponse response: SKProductsResponse) {
print("Product Request")
let myProduct = response.products
for product in myProduct{
print("Product Added")
print(product.productIdentifier)
print(product.localizedTitle)
print(product.localizedDescription)
print(product.price)
list.append(product as SKProduct)
}
}
func paymentQueue(queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) {
print("Add Payment")
for transaction:AnyObject in transactions{
let trans = transaction as! SKPaymentTransaction
print(trans.error)
switch trans.transactionState{
case .Purchased:
print("IAP unlocked")
print(p.productIdentifier)
let prodID = p.productIdentifier as String
switch prodID{
case "IAP id":
print("Remove Ads")
removeAds()
default:
print("IAP not setup")
}
queue.finishTransaction(trans)
break
case .Failed:
print ("Buy error")
queue.finishTransaction(trans)
break
default:
print("default: Error")
break
}
}
}
func paymentQueueRestoreCompletedTransactionsFinished(queue: SKPaymentQueue) {
print("Purchases Restored")
_ = []
for transaction in queue.transactions {
let t: SKPaymentTransaction = transaction as SKPaymentTransaction
let prodID = t.payment.productIdentifier as String
switch prodID{
case "IAP id":
print("Remove Ads")
removeAds()
default:
print("IAP not setup")
}
}
}
func finishTransaction(trans:SKPaymentTransaction){
print("Finshed Transaction")
}
func paymentQueue(queue: SKPaymentQueue, removedTransactions transactions: [SKPaymentTransaction]) {
print("Remove Transaction")
}
}
Put:
SKPaymentQueue.defaultQueue().addTransactionObserver(self)
in viewDidLoad or viewDidAppear