Error calling "fulfill" from closure

Question

Here's my error...

Thread 1: EXC_BAD_ACCESS (code=1, address=0x18)

Here is my product request delegate...

class ProductRequestDelegate : NSObject, SKProductsRequestDelegate {

    private var products: ([SKProduct]) -> Void

    init(products: @escaping ([SKProduct]) -> Void) {

        self.products = products
    }

    public func productsRequest(_ request: SKProductsRequest, didReceive response: SKProductsResponse) {

        products(response.products)
    }

    public func request(_ request: SKRequest, didFailWithError error: Error) {

    }
}

Here is the request...

fileprivate var productsRequest: SKProductsRequest?

public func getProducts() -> Promise<Set<SKProduct>> {

        return Promise { fulfill, reject in

            productsRequest?.cancel()

            productsRequest = SKProductsRequest(productIdentifiers: productIdentifiers)

            productsRequest!.delegate = ProductRequestDelegate { products in

                self.productsRequest = nil

                fulfill(Set(products))
            }

            productsRequest!.start()
        }
    }

This call results in the error occurring...

_ = iAPHelper.getProducts()

Any ideas why this should not work? It seems that the delegate is deallocated.

Answer 1

The delegate property on SKProductsRequest is unowned(unsafe), so the object assigned to it is deallocated. (Instruments informed me of the deallocation after switching on zombies.)

So, I added a reference to the delegate to the class which contains the function getProducts(). And it works.