ios - StoreKit - restoring multiple non-consumable IAPs -


using tutorial guide, i'm implementing in-app purchases ios app. restore purchases, tutorial uses piece of code:

    // mark: - restore non-consumable purchase button @ibaction func restorepurchasebutt(_ sender: any) {     skpaymentqueue.default().add(self)     skpaymentqueue.default().restorecompletedtransactions() }  func paymentqueuerestorecompletedtransactionsfinished(_ queue: skpaymentqueue) {     nonconsumablepurchasemade = true     userdefaults.standard.set(nonconsumablepurchasemade, forkey: "nonconsumablepurchasemade")      uialertview(title: "iap tutorial",     message: "you've restored purchase!",     delegate: nil, cancelbuttontitle: "ok").show() }

on paymentqueuerestorecompletedtransactionsfinished function non-consumable purchase set bought, , alert shown. however, don't quite understand how function called, seems set iap set bought if hasn't been bought before. checks first if purchase made, if have multiple non-consumable purchases in app? if of items have been purchased?

what correct way restore purchases when multiple non-consumables available purchase?


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