iOS: In App Purchase with buying progress indicator UIActivityIndicatorView - ios

Question

I tried several solutions on this board but never successful. What I want is when the user click Buy Button, an UIAlertView with UIActivityIndicatorView appears waiting for the app accessing the app store. But I do not know where to dismiss this UIAlertView once the purchase is done. I know that to dismiss a UIAlertView, we use: [alert dismissWithClickedButtonIndex:-1 animated:YES];
So would you please help me answer two questions:
1) Is my code below OK or any other better to achieve it?
2) Where should I dismiss UIAlertView for all cases:
User accepts to purchase
User cancels to purchase
Purchase is not successful
Following is my code:
-(void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray *)transactions{
UIAlertView *alert;
for(SKPaymentTransaction *transaction in transactions){
switch (transaction.transactionState) {
case SKPaymentTransactionStatePurchasing:
alert = [[UIAlertView alloc]initWithTitle: #"In App Purchase" message: #"Processing your purchase..." delegate: nil cancelButtonTitle: nil otherButtonTitles: nil];
UIActivityIndicatorView *ind = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle: UIActivityIndicatorViewStyleWhiteLarge];
[ind startAnimating];
[alert addSubview: ind];
[alert show];
[ind release];
[alert release];
break;
case SKPaymentTransactionStatePurchased:
[[SKPaymentQueue defaultQueue]finishTransaction:transaction];
UIAlertView *tmp = [[UIAlertView alloc]
initWithTitle:#"Complete"
message:#"You have bought the full version!"
delegate:self
cancelButtonTitle:nil
otherButtonTitles:#"Ok", nil];
[tmp show];
[tmp release];
break;
case SKPaymentTransactionStateRestored:
[[SKPaymentQueue defaultQueue]finishTransaction:transaction];
break;
case SKPaymentTransactionStateFailed:
if (transaction.error.code !=SKErrorPaymentCancelled) {
[[SKPaymentQueue defaultQueue]finishTransaction:transaction];
UIAlertView *tmp = [[UIAlertView alloc]
initWithTitle:#"Error"
message:#"Purchase not successful!"
delegate:self
cancelButtonTitle:nil
otherButtonTitles:#"Ok", nil];
[tmp show];
[tmp release];
}
[[SKPaymentQueue defaultQueue]finishTransaction:transaction];
break;
}
}
}

Answer 1

Try add
case SKPaymentTransactionStatePurchased:
[alert dismissWithClickedButtonIndex:-1 animated:YES];
and
case SKPaymentTransactionStateFailed:
[alert dismissWithClickedButtonIndex:-1 animated:YES];