从闭包中调用 "fulfill" 时出错

Question

这是我的错误...

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

这是我的产品请求代表...

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) {

    }
}

这是请求...

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()
        }
    }

此调用导致发生错误...

_ = iAPHelper.getProducts()

知道为什么这不起作用吗？委托似乎被释放了。

Answer 1

SKProductsRequest 上的委托属性是 unowned(unsafe)，因此分配给它的对象被释放。（仪器在打开僵尸后通知我重新分配。）

因此，我向包含函数 getProducts() 的 class 添加了对委托的引用。并且有效。

从闭包中调用 "fulfill" 时出错

Error calling "fulfill" from closure

swift

storekit

promisekit