我在我的appwhere中使用inAppPurchase didReceiveResponse方法从未调用但每次调用didFailedWithError

Question

我正在尝试在我的应用中添加App Purchase。我已经完成了这段代码。 SKProductsRequest的对象是Global。

-(void)requestProductsWithCompletionHandler:(RequestProductsCompletionHandler)completionHandler {

_completionHandler = [completionHandler copy];
_productsRequest = [[SKProductsRequest alloc] initWithProductIdentifiers:_productIdentifiers];
_productsRequest.delegate = self;
[_productsRequest start];
}

在上面的方法_productIdentifiers在我调试时显示正确的值。我的SKProductsRequest委托方法就在这里。

-(void)productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response {
NSLog(@"Loaded list of products...");
_productsRequest = nil;
NSArray * skProducts = response.products;
    for (SKProduct * skProduct in skProducts) {
        NSLog(@"Found product: %@ %@ %0.2f",
        skProduct.productIdentifier,
        skProduct.localizedTitle,
        skProduct.price.floatValue);
    }
_completionHandler(YES, skProducts);
_completionHandler = nil;
}

-(void)request:(SKRequest *)request didFailWithError:(NSError *)error {
NSLog(@"Failed to load list of products.");
_productsRequest = nil;
_completionHandler(NO, nil);
_completionHandler = nil;
}

我的问题是每次调用didFailWithError方法但从未调用didReceiveResponse方法。 我希望有人帮助我。 提前谢谢。