应用内购买：产品标识无效iOS 9 Swift 2

我一直收到这个无效的产品标识。我的代码好吗？可能是什么问题呢？香港专业教育学院编写的代码打印出来我在应用内购买，但如果它一直要这样一句话：应用内购买：产品标识无效iOS 9 Swift 2

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

在iTunes上我的应用程序内购买页面连接我对产品的准确ID复制到的Xcode但它仍然不起作用。

我全码：

//global variables 
var productsArray: Array<SKProduct!> = [] 
var productIdentifiers = Set<NSObject>() 

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

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

func productsRequest(request: SKProductsRequest, didReceiveResponse response: SKProductsResponse) { 
    if response.invalidProductIdentifiers.count != 0 { 
     print("here") 
     print(response) 
     print(response.invalidProductIdentifiers.description) 
     print("here2") 
    } 

    if response.products.count != 0 { 
     for product in response.products { 
      productsArray.append(product) 
      print(productsArray) 
     } 
    } 
    else { 
     print("There are no products.") 
    } 
}

来源

2015-12-10 Abdul Mirza