If the user bought before and is installing the app on another device, then s/he will know that the purchase button will give the option to restore. But when you want the best, the absolute top of the category, PCalc (9.99) from TLA Systems claims that it's the one to beat. Hundreds of alternative calculator apps, both free and paid, are available from the App Store. The calculator you want should say Calculator with Utilities underneath in smaller text and an app icon that looks. Type calculator in the Search field, then tap Searc h. The app is universal, which means you buy it once and then can use it on iPad. The calculator app that comes bundled in iOS is adequate for basic, quick calculations, but it lacks even a simple memory function or running history of operations. All you need to do is reinstall the missing Calculator app for it to reappear in the Control Center. If the user is buying for the first time, then s/he won't be worried about buying twice anyway. PCalc is a beautifully-designed, dynamic calculator for iPhone and iPad. James Thomsons PCalc calculator app has been among the first to adopt all new Apple technology for decades. So the restore option will restore and the purchase will purchase, eventually. Unsurprisingly, PCalc for Mac has native M1 support. Then in the alert view delegate function: -(void) alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex No, there is unfortunately no way for Apple to know that you are an existing owner of PCalc, so you will be charged twice if you do so. I know it's an old question and you probably solved it, but I had a similar problem in terms of designing a user friendly interface for the purchase mechanism and found a solution like this: -(IBAction) purchase Is there a way to determine if this in-app purchase has already been made by the user? So my question is how do I determine if the app has been purchased before so I can either display a 'Purchase' button or a 'Restore' button. Problem is NSUserDefaults purchased = YES will not be available on re-install or new install. so if I were to start today Im not sure if I would buy this or not. Seems logical to me - user doesn't want to see a 'Purchase' button - they have purchased already. There might be other calculator apps out there, and they might be good. 'Restore' button would be clicked and restoreCompletedTransactions would be called. Now when the user deletes the app and wants to reinstall or install on a new device then what I would like to show, in these cases, in place of the 'Purchase' button is a 'Restore' button. Printing calculator ideal for addition, subtraction, multiplication and division calculations, the calculator will also allow you to automatically obtain the sum of the totals of. 'Pcalc' can be directly connected to a thermal printer via Bluetooth. If the purchase is successful then update NSUserDefaults purchased = YES and the button is removed. 'PCalc' is a printing calculator, specialized for sales, for home or workplace. and definite integrals, double and triple integrals, and improper integrals. I have a button that says 'Purchase' (for a non-consumable). PCalc VS WolframAlpha Compare PCalc VS WolframAlpha and see what are their. Why it's so hard to find out how to do this is beyond me - so maybe I am trying to do this the wrong way - who knows - well hopefully one of you, lol.
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