Detect re-purchase of in-app purchase

How can I detect this situation in code:

• User purchase a full version with in-app purchase.

• User delete the application from iPhone.

• User installed the application again

• User purchases full version,

My problem is that in testing, I can see a message box saying "you already purchased...", but in the application updateTransactions not called.

In this situation I need to change to full version. How can I detect this event? I.e., How can I know in my application that the user 开发者_开发百科already purchased so I will "open" to full version?

Thanks.

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Use [[SKPaymentQueue defaultQueue] restoreCompletedTransactions]. It will force your app to receive transactions again.

See docs:

• Restoring transactions
• - restoreCompletedTransactions