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//SKProductsRequestDelegate
-(void)productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response
{
    NSArray<SKProduct *> *products = response.products;
    SKProduct *product = [products count] == 1 ? [[products firstObject] retain] : nil;

    if (product == nil) {
        //Invalid product ID
        NSString *invalidId = [response.invalidProductIdentifiers firstObject];
        QMetaObject::invokeMethod(backend, "registerQueryFailure", Qt::AutoConnection, Q_ARG(QString, QString::fromNSString(invalidId)));
    } else {
        //Valid product query
        //Create a IosInAppPurchaseProduct
        IosInAppPurchaseProduct *validProduct = new IosInAppPurchaseProduct(product, backend->productTypeForProductId(QString::fromNSString([product productIdentifier])));
        if (validProduct->thread() != backend->thread()) {
            validProduct->moveToThread(backend->thread());
            QMetaObject::invokeMethod(backend, "setParentToBackend", Qt::AutoConnection, Q_ARG(QObject*, validProduct));
        }
        QMetaObject::invokeMethod(backend, "registerProduct", Qt::AutoConnection, Q_ARG(IosInAppPurchaseProduct*, validProduct));
    }

    [request release];
}

-(void)dealloc
{
    [[SKPaymentQueue defaultQueue] removeTransactionObserver:self];
    [pendingTransactions release];
    [super dealloc];
}

IosInAppPurchaseBackend::~IosInAppPurchaseBackend()
{
    [m_iapManager release];
}

void IosInAppPurchaseBackend::initialize()
{
    m_iapManager = [[QT_MANGLE_NAMESPACE(InAppPurchaseManager) alloc] initWithBackend:this];
    emit InAppPurchaseBackend::ready();
}

class QtAdMobBannerIos : public IQtAdMobBanner
{
...
#if defined(__OBJC__)
    __unsafe_unretained QtAdMobBannerDelegate* m_AdMob;
#else
    void* m_AdMob;
#endif
...
};

QtAdMobBannerIos::QtAdMobBannerIos(QObject* parent)
    : IQtAdMobBanner(parent)
    , m_BannerSize(IQtAdMobBanner::Banner)
    , m_LoadingState(Idle)
{
    QtAdMobBannerDelegate *delegate = [[QtAdMobBannerDelegate alloc] initWithHandler:this];
    m_AdMob = (__bridge QtAdMobBannerDelegate*)(__bridge_retained void*)delegate;
}