通过2个不同视图控制器的应用内购买访问viewControllers

Question

你们有没有人试过在app中实现IAP商店视图控制器，可以从2个不同的视图控制器访问？如果有人能分享这样的经历，我真的很感激。

我正在尝试从2个不同的视图控制器访问StoreViewController（您可以在其中购买应用内购买）。这张图片显示了我的意思：

因此，黑色和蓝色VC都实现了SKProductsRequestDelegate方法。

这是1的代码，但它在2中是相同的：

        let productID1 = "id1"
            let productID2 = "id2"
            let productID3 = "id3"
            let productID4 = "id4"

            var product1 : SKProduct?
            var product2 : SKProduct?
            var product3 : SKProduct?
            var product4 : SKProduct?

    /////// THIS BUTTON TAKES USER TO STORE
    @IBAction goToStore(){
    getProductInfo()
    }
        func getProductInfo(){
            if SKPaymentQueue.canMakePayments() {
                let request = SKProductsRequest(productIdentifiers: Set([productID1,productID2,productID3,productID4]))
                request.delegate = self
                request.start()
                print("looking for IAP")
            }else{
                print("make IAP available in Settings")
            }
        }

    func productsRequest(request: SKProductsRequest, didReceiveResponse response: SKProductsResponse) {

            let products = response.products
            if products.count != 0{
                for product in products{
                    switch product.productIdentifier{
                    case "id1":
                        product1 = product
                        break
                    case "id2":
                        product2 = product
                        break
                    case "id3":
                        product3 = product
                        break
                    case "id4":
                        product4 = product
                        break

                    default:
                        break
                    }
                }
                print("I do have products")
                performAnimation()

                //            }

            }else{
                print("product not found")
            }
            let invalidProducts = response.invalidProductIdentifiers
            for productk in invalidProducts{
                print("Pr not found \(productk)")
            }
        }

    func performAnimation(){

     let story = UIStoryboard(name: "Main", bundle: nil)
     let storeViewController = story.instantiateViewControllerWithIdentifier("StoreViewController") as! StoreViewController
     storeViewController.product1 = self.product1
     storeViewController.product2 = self.product2
     storeViewController.product3 = self.product3
     storeViewController.product4 = self.product4

       self.presentViewController(storeViewController, animated: false, completion: nil)})

                })
            }

//////////////////// storeViewController中的代码

            let productID1 = "id1"
            let productID2 = "id2"
            let productID3 = "id3"
            let productID4 = "id4"
            var product1 : SKProduct?
            var product2 : SKProduct?
            var product3 : SKProduct?
            var product4 : SKProduct?

 viewDidLoad(){
                SKPaymentQueue.defaultQueue().addTransactionObserver(self)
    }
//// PRESSED WHEN USER WANTS TO BUY ITEMS
@IBAction func buyButtonPressed(sender: UIButton) {
    let items = itemsToBuy.count
    if items > 0{
        switch items{
        case 1:
            let payment = SKPayment(product: product1!)
             print("description \(payment.description), identifier: \(payment.productIdentifier), data: \(payment.requestData)")
            SKPaymentQueue.defaultQueue().addPayment(payment) ///////// ERROR HERE

        case 2:
            let payment = SKPayment(product: product2!)
            SKPaymentQueue.defaultQueue().addPayment(payment)

        case 3:
            let payment = SKPayment(product: product3!)
            SKPaymentQueue.defaultQueue().addPayment(payment)

        case 4:
            let payment = SKPayment(product: product4!)
            SKPaymentQueue.defaultQueue().addPayment(payment)

        default:
            break
        }


    }

}

func paymentQueue(queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) {
    for transaction in transactions{
        switch transaction.transactionState{
        case SKPaymentTransactionState.Purchased:
            self.buyItems()
            SKPaymentQueue.defaultQueue().finishTransaction(transaction)
            print("bought")
        case SKPaymentTransactionState.Failed:
            SKPaymentQueue.defaultQueue().finishTransaction(transaction)
            print("error not bought")
        default:
            break
        }
    }
}

我从VC1去商店，成功购买和购买。比我从VC2存储（反之亦然）并且我在switch语句中的行SKPaymentQueue.defaultQueue().addPayment(payment)上出现错误：EXC_BAD_ACCESS。

当只能从一个VC访问存储而不能从两个VC访问存储时，才会发生此错误。此外，如果我仅从一个VC进行多次付款，它可以正常工作。可能是什么原因？是否只有一个viewController能够实现SKProductsRequestDelegate方法？

编辑：//在SKPaymentQueue.defaultQueue().addPayment(payment)行之前添加了一个打印语句。购买（1.成功，2。不成功）的结果是

 description <SKPayment: 0x174204720>, identifier: id1, data: nil

和

 description <SKPayment: 0x17001e1b0>, identifier: id1, data: nil