Question

is there a way to detect if a user has payed for an app already?

I want to integrate iAd in an app which is sold already – now i want not to show the ads to the old users when they upgrade.

edited: the new version of the app will be free then!

Any ideas?

Answer 1

It can be easily done by NSUserDefaults.

When the user pay add a value to NSUserDefault like:

[[NSUserDefaults standardUserDefaults] setBool:TRUE forKey:@"Paid"];

When you need to check whether he paid or not:

if([[NSUserDefaults standardUserDefaults] boolForKey:@"Paid"])
{
  //paid user
}
else
{
 //Not paid user can show iAd
}