In app purchase not work

问题

I use this tutorial http://www.raywenderlich.com/2797/introduction-to-in-app-purchases for create purchases in my app.

From time to time this code is working or not working. I know it sounds funny, but this is my problem.

For example: First start app (all items download and shows in table and i have available to purchase any of this), but at the next time (for example second start) I get an error on this line:

SKProduct *product = [[InAppRageIAPHelper sharedHelper].products objectAtIndex:0]; 

The error is

Terminating app due to uncaught exception 'NSRangeException' index 0 beyond bounds for empty array

回答1:

If you want to avoid this kind of crash just put a condition before processing the product like this:

if ([[InAppRageIAPHelper sharedHelper].products count] >0)
{
   SKProduct *product = [[InAppRageIAPHelper sharedHelper].products objectAtIndex:0];
   //product processing goes here
}
else
{
   NSLog (@"Warning: no products returned");
}

回答2:

use this Code when you use the payment method.....like payment button pressed

NSLog(@"Products - %@",[IAPClockDietHelper sharedHelper].products);

You found , when You start App First time then You have products valve...and when You use app Second time then Products have NULL Value....So Your Application is Crash ...check ..

回答3:

This problem I solved after make hard reset for my device.

来源：https://stackoverflow.com/questions/9158778/in-app-purchase-not-work