ios - SKProductsRequestDelegate 方法未在类内调用

Question

我想在显示实际页面之前加载 SKProduct。但是我在创建它时遇到了一些困难。

我的想法是制作另一个加载产品的类，如下所示:

class GetIapInfo: NSObject, SKProductsRequestDelegate {

    var list = [SKProduct]()
    var p = SKProduct()

    let audio = "com.xxx";
    let video = "com.xxx"
    let complete = "com.xxx"

    override init() {
        super.init()

        if SKPaymentQueue.canMakePayments() {
            print("starting IAPS")
            let productIdentifiers = Set([audio, vídeo, complete])

            let request = SKProductsRequest(productIdentifiers: productIdentifiers)
            request.delegate = self
            request.start()
        } else {
            print("please enable IAPS")
        }
    }

    internal func productsRequest(_ request: SKProductsRequest, didReceive response: SKProductsResponse) {
        print("product request")
        let myProduct = response.products

        for product in myProduct {
            print("product added from ding")
            print(product.productIdentifier)
            print(product.localizedTitle)
            print(product.localizedDescription)
            print(product.price)
        } 
    }
}

但这只调用了 init 方法，仅此而已，它没有调用 productsRequest 方法。这与委托(delegate)有关吗？

我该如何保存将要退回的产品？因为我以后需要它们。

Answer 1

您可能应该保留对您在 GetIapInfo.init() 中创建的 SKProductsRequest 对象的引用。当 init 方法存在时，您当前的代码将解除分配 request 对象。这或许可以解释为什么您的委托(delegate)根本没有被调用；)

来自SKProductsRequest class documentation :

Be sure to keep a strong reference to the request object; otherwise, the system might deallocate the request before it can complete.

例如，为它创建一个存储属性:

private let request: SKProductsRequest!

通过实现此委托(delegate)方法跟踪任何与请求相关的错误也是一个好主意:

func request(_ request: SKRequest, didFailWithError error: Error) {
    print("Request failed: \(error)")
}