MKStoreKit how to change the purchase confirm dialog title

I am using in-app purchase to buy a set audiobooks.

I am using MKStoreKit wrapper for in-app purchase. my products are of non consumable type.therefore bought only once.

However whenever i press the buy button the message "Do you want to buy one {audiobook name} for {price}" .

how to change this message?

if any one has used MKStoreKit, how to know if the purchase is completed.(I need to开发者_JS百科 change the title of button only if the purchase is complete).

I'm not really sure, but I think you can't customize this alert, it's specific to Apple. And about how to know if the purchase is completed, I suggest you to take a look at this website, and specially at this method :

- (void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray *)transactions
{
    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];
                break;
            default:
                break;
        }
    }
}

You also have to call this before ( again, take a look on the website above ) :

[[SKPaymentQueue defaultQueue] addTransactionObserver:self];

When the transaction.transactionState is SKPaymentTransactionStatePurchased, this means that the transaction is completed.

Hope it helps