ios - 购买应用程序后，应用程序在启动时崩溃。产品标识符=无？

Question

我有一些用户报告说，在尝试应用内购买后，应用现在在启动时崩溃。我已要求他们删除并重新安装未运行的应用程序，并试图要求他们进入飞行模式以停止任何未运行的网络通信。

我无法在我的设备上以任何方式复制错误，我的应用程序内购买在沙盒和生产模式下运行良好。我的想法是，他们的交易以某种方式收到了一个 nil productIdentifier，这导致了启动崩溃，但我不确定在应用程序启动时调用了哪些交易观察器方法，我可以为他们解决这个问题。

是否有某种方法可以“清除”事务队列或以其他方式在启动时测试 nil productidentifiers 并允许这些用户至少再次运行该应用程序？我已经使用下面的代码进行了数百次应用内购买，而这最近才开始发生。应用程序启动时会调用哪些辅助方法？

在 AppDelegate.m 中

[[SKPaymentQueue defaultQueue] addTransactionObserver:[MovieClockIAPHelper sharedHelper]];

在应用程序帮助代码中:

- (id)initWithProductIdentifiers:(NSSet *)productIdentifiers {
    if ((self = [super init])) {

        // Store product identifiers
        _productIdentifiers = [productIdentifiers retain];

        // Check for previously purchased products

        NSMutableSet * purchasedProducts = [NSMutableSet set];
        for (NSString * productIdentifier in _productIdentifiers) {

            BOOL productPurchased = [[NSUserDefaults standardUserDefaults] boolForKey:productIdentifier];

            if (productPurchased) {
                [purchasedProducts addObject:productIdentifier];
                NSLog(@"Previously purchased: %@", productIdentifier);
            }
            else{
            NSLog(@"Not purchased: %@", productIdentifier);
            }
        }
        self.purchasedProducts = purchasedProducts;

    }
    return self;
}

- (void)requestProducts {

    self.request = [[[SKProductsRequest alloc] initWithProductIdentifiers:_productIdentifiers] autorelease];
    _request.delegate = self;
    [_request start];

}

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

    NSLog(@"Received products results...");   
    self.products = response.products;
    self.request = nil;    

    [[NSNotificationCenter defaultCenter] postNotificationName:kProductsLoadedNotification object:_products];    
}


- (void)restoreCompletedTransactions {
    [[SKPaymentQueue defaultQueue] restoreCompletedTransactions];
}

- (void)provideContent:(NSString *)productIdentifier {

    NSLog(@"Toggling flag for: %@", productIdentifier);
    [[NSUserDefaults standardUserDefaults] setBool:TRUE forKey:productIdentifier];
    [[NSUserDefaults standardUserDefaults] synchronize];
    [_purchasedProducts addObject:productIdentifier];

    [[NSNotificationCenter defaultCenter] postNotificationName:kProductPurchasedNotification object:productIdentifier];

}

- (void)completeTransaction:(SKPaymentTransaction *)transaction {

    NSLog(@"completeTransaction...");

    [self recordTransaction: transaction];
    [self provideContent: transaction.payment.productIdentifier];
    [[SKPaymentQueue defaultQueue] finishTransaction: transaction];

}

- (void)restoreTransaction:(SKPaymentTransaction *)transaction {

    NSLog(@"restoreTransaction...");


    [self recordTransaction: transaction];
    [self provideContent: transaction.originalTransaction.payment.productIdentifier];
    [[SKPaymentQueue defaultQueue] finishTransaction: transaction];

}

- (void)failedTransaction:(SKPaymentTransaction *)transaction {

    if (transaction.error.code != SKErrorPaymentCancelled)
    {
        NSLog(@"Transaction error: %@", transaction.error.localizedDescription);
    }

    [[NSNotificationCenter defaultCenter] postNotificationName:kProductPurchaseFailedNotification object:transaction];

    [[SKPaymentQueue defaultQueue] finishTransaction: transaction];

}

- (void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray *)transactions
{
    NSLog(@"in the payment queue");

    for (SKPaymentTransaction *transaction in transactions)
    {

        switch (transaction.transactionState)
        {
            case SKPaymentTransactionStatePurchased:
                [self completeTransaction:transaction];
                break;
            case SKPaymentTransactionStateFailed:
                [self failedTransaction:transaction];
                break;
            case SKPaymentTransactionStateRestored:
                [self restoreTransaction:transaction];
            default:
                break;
        }
        }

}

-(void)buyProduct:(SKProduct *)product
{
    NSLog(@"In buyproduct Buying %@...", product.productIdentifier);

    SKPayment *payment = [SKPayment paymentWithProduct:product];

    [[SKPaymentQueue defaultQueue] addPayment:payment];
}

- (void)dealloc
{
    [_productIdentifiers release];
    _productIdentifiers = nil;
    [_products release];
    _products = nil;
    [_purchasedProducts release];
    _purchasedProducts = nil;
    [_request release];
    _request = nil;
    [super dealloc];
}

@end

Answer 1

当交易在 SKPaymentTransactionStateRestored 中时，我遇到了类似的问题。我的测试表明这可能是 IOS 7.0.3 的问题，但我无法验证这一点。

StoreKit 会保存一份您的应用程序必须完成的持久事务列表。正如您所注意到的，交易将在每次启动时报告，直到它完成。

我们实现的解决方案是在使用前从入口点检查产品标识符是否为 nil:

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

即使我们收到一个产品标识符为零的交易，我们也能够成功调用 finishTransaction。

希望对您有所帮助。