Determine when user purchased iPhone application [closed]

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Closed 9 years ago.

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Is it possi开发者_运维技巧ble to determine when a user first purchased your application? (Not just when they last downloaded it, hopefully device independent)

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You could store the first run into the NSUserDefaults, the only problem with this approach is if they delete and reinstall the App you would lose the data:

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:[NSDate date] forKey:@"FirstRun"];