Products request crash in Swift language

I have this code to handle in app purchase's

import Foundation
import StoreKit

class iap: NSObject, SKProductsRequestDelegate,SKPaymentTransactionObserver {


    var productsArray = Array<SKProduct>()
    var product: SKProduct?

    override init()
    {
        super.init()

        if SKPaymentQueue.canMakePayments() {
             print("starting IAPS")
            let productIdentifiers = Set(["com.blabla.bla.pro"])
            let request = SKProductsRequest(productIdentifiers: productIdentifiers as Set<String>)
            request.delegate = self
            request.start()
        } else {
            print("please enable IAPS")
        }
    }

    // 1
    var list = [SKProduct]()
    var p = SKProduct()

    // 2
    func buyProduct() {
        print("buy " + p.productIdentifier)
        let pay = SKPayment(product: p)
        SKPaymentQueue.defaultQueue().addTransactionObserver(self)
        SKPaymentQueue.defaultQueue().addPayment(pay as SKPayment)
    }

    //3
    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 )
        }


    }

    // 4
    func paymentQueueRestoreCompletedTransactionsFinished(queue: SKPaymentQueue) {
        print("transactions restored")

        for transaction in queue.transactions {
            let t: SKPaymentTransaction = transaction

            let prodID = t.payment.productIdentifier as String

            switch prodID {
            case "com.blabla.bla.pro":
                print("pro upgrade update only basic stuff futher updates must be payed")


            default:
                print("IAP not setup")
            }

        }
    }

    // 5
    func paymentQueue(queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) {
        print("add paymnet")

        for transaction:AnyObject in transactions {
            let trans = transaction as! SKPaymentTransaction
            print(trans.error)

            switch trans.transactionState {

            case .Purchased:
                print("buy, ok unlock iap here")
                print(p.productIdentifier)

                let prodID = p.productIdentifier as String
                switch prodID {
                case "com.blabla.bla.pro":
                    print("pro upgrade update only basic stuff futher updates must be payed")


                default:
                    print("IAP not setup")
                }

                queue.finishTransaction(trans)
                break;
            case .Failed:
                print("buy error")
                queue.finishTransaction(trans)
                break;
            default:
                print("default")
                break;

            }
        }
    }

    // 6
    func finishTransaction(trans:SKPaymentTransaction)
    {
        print("finish trans")
        SKPaymentQueue.defaultQueue().finishTransaction(trans)
    }

    //7
    func paymentQueue(queue: SKPaymentQueue, removedTransactions transactions: [SKPaymentTransaction])
    {
        print("remove trans");
    }

} 

And when a view is loaded I call the iap class:

class test: UITabBarController {

    override func viewDidLoad() {
        super.viewDidLoad()

        let inAppPurchase = iap()

    }
}

The call works, but the only thing I see is starting iaps, than it crashes with this error: message sent to deallocated instance.

And this is the result when I log with zombies.

I have tried everything, but with this error as result. How can I solve this?

Your iap class is getting released when you go out of scope, after you make the request. Store it in a property to keep it alive:

class test: UITabBarController {

    let inAppPurchase = iap()

    override func viewDidLoad() {
        super.viewDidLoad()
    }
}