Question

I just added one in-app purchase to my app.
When a user click on the “purchase” button and the transaction ends, the “purchase” button is replaced by another button to access to the new features.
But everytime I come back to that page or I close and open again the app, there is again the “purchase” button.
How can I do to have always the new button if the user has purchased the new contents?
Here is my code:

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

    for (SKPaymentTransaction *transaction in transactions) {

          switch (transaction.transactionState) {

               case SKPaymentTransactionStatePurchasing:

                    break;

               case SKPaymentTransactionStatePurchased:

               [[SKPaymentQueue defaultQueue] finishTransaction:transaction];

                           UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];

                              [button addTarget:self 

                               action:@selector(myaction)

                               forControlEvents:UIControlEventTouchUpInside];

                    [button setTitle:@"mytitle" forState:UIControlStateNormal];



                    button.frame = CGRectMake(156.0, 248.0, 129.0, 36.0);

                    [self.view addSubview:button];

                    break;

               case SKPaymentTransactionStateRestored:

                    [[SKPaymentQueue defaultQueue] finishTransaction:transaction];
                         break;

               case SKPaymentTransactionStateFailed:

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

                         NSLog(@"Errorr");

                    }

                    [[SKPaymentQueue defaultQueue] finishTransaction:transaction];


          }

     }

}

Answer 1

You should save somewhere information about the fact that user has purchased the content.

There are a lot of ways to do that. For example, you could use NSUserDefaults:

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
int version = [defaults integerForKey:@"db_version"];                 // <- read int value from defaults
[defaults setValue:[NSNumber numberWithInt:2] forKey:@"db_version"];  // <- set int value
[defaults synchronize];    // <- save changes