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    <p>The answer above is technically correct but it is not complete. As Megastep said "the object you set as the delegate for the SKProductsRequest may have already been deallocated." Therefore you are sending a message to an object that has already been deallocated. Now onto the actual answer:</p> <pre><code>- (void)requestProUpgradeProductData { NSSet *productIdentifiers = //Your Product IDs go here productsRequest = [[SKProductsRequest alloc] initWithProductIdentifiers:productIdentifiers]; productsRequest.delegate = self; [productsRequest start]; // we will release the request object in the delegate callback } #pragma mark - #pragma mark SKProductRequest Delegate Methods - (void)productsRequest:(SKProductsRequest *)request didReceiveResponse(SKProductsResponse *)response { self.products = response.products; //NSLog(@"%i",[products count]); proUpgradeProduct = [products count] == 4 ? [[products objectAtIndex:0] retain] : nil; if (proUpgradeProduct) { //Do your stuff here... } for (NSString *invalidProductId in response.invalidProductIdentifiers) { //NSLog(@"Invalid product id: %@" , invalidProductId); } // finally release the reqest we alloc/init’ed in requestProUpgradeProductData [productsRequest release]; [[NSNotificationCenter defaultCenter] postNotificationName:kInAppPurchaseManagerProductsFetchedNotification object:self userInfo:nil]; } </code></pre> <p>So basically as you can see above you do not need to release productsRequest because it is already being released in the delegate callback method. Again you do not need to call productsRequest release or set it Nil in viewDidUnload/dealloc method because that could cause a crash if you dismiss the view before the callback method gets called.</p>
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