Swift:恢复应用程序中的购买，没有失败的案例称为

Question

我可以毫不费力地购买和恢复非消耗品.

但是，如果我试图从一个从未购买该产品的帐户中恢复，则不会调用productsRequest(_ request: SKProductsRequest, didReceive response: SKProductsResponse)方法，而在成功的还原中调用该方法。

下面是我在符合SKPaymentTransactionObserver协议的类中的代码：

public func restorePurchases() {
    print("restoring...")
    SKPaymentQueue.default().add(self)
    SKPaymentQueue.default().restoreCompletedTransactions()
}

public func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) {
    for transaction in transactions {

        // finishtTransaction() is called within the sub functions

        switch (transaction.transactionState) {
        case .purchased:
            print("pruchased !")
            complete(transaction: transaction)
            break
        case .failed:
            print("failed !")
            fail(transaction: transaction)
            break
        case .restored:
            print("restored !")
            restore(transaction: transaction)
            break
        case .deferred:
            print("deferred !")
            break
        case .purchasing:
            print("purchasing !")
            break
        default:
            print("default...")
            break
        }
    }
}

请注意，我可以购买和恢复产品，我只是从来没有收到答复时，没有什么可以恢复。

Answer 1

实际上，您只需要实现以下方法：

public func paymentQueueRestoreCompletedTransactionsFinished(_ queue: SKPaymentQueue) {
    if (queue.transactions.count == 0)
    {
        print("Nothing to restore...")
    }
}