Question

I got sample code online about in-app purchases. When the purchase completes, I want a value to state it is bought.

For example, an integer within the app could be equal to 1 or a string could say “Bought”. The user will not see this, it is just for reference. When the user goes to the storefront next time, if they hit a button, I want it to check to see if this value is equal to 1 or Bought. If it is, I will have it move to the next page from there.

How can this be done?

Answer 1

Check out this tutorial on In-App Purfchases.

Edit:

There are quite a few ways to achieve what you are looking for. No one will write your code for you ( unless you hire them ;-D ). You should look more into the StoreKit framework to get a better understanding of how it works. You will then learn how to manage purchases and how to check if an item is purchased.

For In-App purchases, I like to use UrbanAirship‘s In-App Purchase classes.

This is how I keep local tabs on items purchased in one of my apps:

+ (void) updateProductsFromPurchases
{
    if ([[NSFileManager defaultManager] fileExistsAtPath:PRODUCT_IDS] == NO) {
        [[NSFileManager defaultManager] copyItemAtPath:[[NSBundle mainBundle] pathForResource:@"Products" ofType:@"plist"] 
                                                toPath:Strings(DOC_DIR,@"/Products.plist")
                                                 error:nil];
    }
    /*  update our product id list so we display updated products to the user  */
    NSArray *downloads = [FILEMANAGER contentsOfDirectoryAtPath:DOWNLOADS error:nil];
    for (NSString *purchased in downloads) 
    {
        if ( [purchased hasPrefix:@"com"] ) 
        {
            /*  for each purchase, add it to the list of product id's  */
            NSMutableArray *addPurchase = [NSMutableArray arrayWithContentsOfFile:PRODUCT_IDS];
            /*  this is to make sure we don't add duplicate product id's  */
            if ( ! [addPurchase containsObject:purchased] ) 
            {
                [addPurchase addObject:purchased];
                [addPurchase writeToFile:PRODUCT_IDS atomically:YES];
            }
        }
    }
}