在应用程序购买Xcode swift SKScene

Question

我试图在我的游戏中SKScene创建应用内购买。这个场景叫做coinShop。基本上，IAP为用户提供300个硬币。当我尝试复制代码时，它说SKScene不能符合我尝试添加的代表。如果有人知道应用程序如何购买场景而不是视图控制器，我很想知道。以下是与应用内购买相关的所有代码

在didMoveToView（）中，我有

SKPaymentQueue.defaultQueue().addTransactionObserver(self)

    requestProductInfo()

    productIDs.append("com.ClearRockTechnologies.alien-anarchy.300Coins")

然后我有以下功能

func requestProductInfo() {
    if SKPaymentQueue.canMakePayments() {
        let productIdentifiers = NSSet(array: productIDs)
        let productRequest = SKProductsRequest(productIdentifiers: productIdentifiers as Set<NSObject> )

        productRequest.delegate = self
        productRequest.start()
    }
    else {
        print("Cannot perform In App Purchases.")
    }
}






func productsRequest(request: SKProductsRequest, didReceiveResponse response: SKProductsResponse) {
    if response.products.count != 0 {
        for product in response.products {
            productsArray.append(product)
        }

    }
    else {
        print("There are no products.")
    }



    if response.invalidProductIdentifiers.count != 0 {
        print(response.invalidProductIdentifiers.description)
    }
}

func showActions() {

    let payment = SKPayment(product: self.productsArray[0] as SKProduct)
    SKPaymentQueue.defaultQueue().addPayment(payment)
    //self.transactionInProgress = true
}


func paymentQueue(queue: SKPaymentQueue!, updatedTransactions transactions: [AnyObject]!) {
    for transaction in transactions as! [SKPaymentTransaction] {
        switch transaction.transactionState {
        case SKPaymentTransactionState.Purchased:
            print("Transaction completed successfully.")
            SKPaymentQueue.defaultQueue().finishTransaction(transaction)
            coins+=300
            NSUserDefaults.standardUserDefaults().setInteger(coins, forKey: "coins")
        case SKPaymentTransactionState.Failed:
            print("Transaction Failed");
            SKPaymentQueue.defaultQueue().finishTransaction(transaction)

        default:
            print(transaction.transactionState.rawValue)
        }
    }
}

这是我的两个错误，

1. 键入＆＃39; coinShop＆＃39;不符合协议＆＃39; SKPaymentTransactionObserver＆＃39;

2. ＆＃39;的NSSet＆＃39;不能隐含地转换为＆＃39; Set＆＃39 ;;你的意思是使用＆＃39;作为＆＃39;明确转换？

错误1没有任何建议，错误2告诉我添加为＆＃34; Set＆lt; NSObject＆gt;＆＃34;到这条线 let productRequest = SKProductsRequest(productIdentifiers: productIdentifiers as Set<NSObject> )  但我显然已经有了。任何帮助，将不胜感激。