Objective c 如何在ios5中进行应用内购买？

我在应用程序内购买时使用了以下代码

- (void)viewDidLoad {
if ([SKPaymentQueue canMakePayments]) {
    NSLog(@"Can Buy Product");

    SKProductsRequest *productRequest=[[SKProductsRequest alloc]initWithProductIdentifiers:[NSSet setWithObject:@"com.mycompany.myproduct.productpack"]];
    productRequest.delegate=self;
    [productRequest start];
}
else {

    NSLog(@"Product Can't be purchased");
}
}

-(IBAction)purchasePack1 {

SKPayment *payment=[SKPayment paymentWithProductIdentifier:@"com.mycompany.myproduct.productpack"];
[[SKPaymentQueue defaultQueue] addTransactionObserver:self];
[[SKPaymentQueue defaultQueue] addPayment:payment];

}


-(void)productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response {

validProduct=nil;
int count=[response.products count];
if (count>0) {
    NSLog(@"Product Avail");

    validProduct=[response.products objectAtIndex:0];
}
else {
    NSLog(@"No Product avail");
    [purchaseBtn setHidden:TRUE];
}
}


-(void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray *)transactions {

for (SKPaymentTransaction *transaction in transactions) {
    switch (transaction.transactionState) {
        case SKPaymentTransactionStatePurchasing:
            NSLog(@"Purchasing");   
            [activityIndicatorObj setHidden:FALSE];
            [activityIndicatorObj startAnimating];
            break;

        case SKPaymentTransactionStatePurchased:

            UIAlertView *alt=[[UIAlertView alloc]initWithTitle:@"Congrats" message:@"Thanks For Purchasing " delegate:self cancelButtonTitle:@"Dismiss" otherButtonTitles:nil];
            [alt show];
            [alt release];
            NSLog(@"Purchased");
            [activityIndicatorObj stopAnimating];
            [activityIndicatorObj setHidden:TRUE];
            [[SKPaymentQueue defaultQueue] finishTransaction:transaction];
            break;

            case SKPaymentTransactionStateFailed:

            if (transaction.error.code!=SKErrorPaymentCancelled) {

                NSLog(@"Cancelled");

            }
            [[SKPaymentQueue defaultQueue] finishTransaction:transaction];

            UIAlertView *alt1=[[UIAlertView alloc]initWithTitle:@"Sorry" message:@"Some Error Encountered!" delegate:self cancelButtonTitle:@"Dismiss" otherButtonTitles:nil];
                [alt1 show];
                [alt1 release];
            NSLog(@"Failed");
            [activityIndicatorObj stopAnimating];
            [activityIndicatorObj setHidden:TRUE];
            break;

            case SKPaymentTransactionStateRestored:
            NSLog(@"Restored");
            [activityIndicatorObj stopAnimating];
            [activityIndicatorObj setHidden:TRUE];
            [[SKPaymentQueue defaultQueue] finishTransaction:transaction];
            break;



        default:
            break;
    }
}
}

当我单击“购买”按钮时，会收到一条警告消息，提示“您已购买此产品，但尚未下载，是否要下载？”

---

当我单击“是”时，我并没有从应用程序中得到任何响应，我确信该产品并没有下载。谁能告诉我这个问题的建议吗。提前感谢。

我没有看到任何

-（void）provideContent:（NSString*）productId的实现-您错过了那部分吗？在任何情况下，当transactionState切换到SKPaymentTransactionState时，您都会收到通知

如果您还没有购买，您可能想看看Ray Wenderlich tut，这将帮助您建立一个应用程序内管理器类。我认为您已经将应用程序内逻辑放在了视图控制器中——最好将该部分放在单独的类中。因此，应用程序内管理器/助手：-）
是否在加载视图时打印“产品可用性”文本？自iOS 5以来，paymentWithProductIdentifier:已被弃用。您应该使用paymentWithProduct:代替。