SKPaymentTransactionObserver 的 updatedTransactions 委托方法中的事务状态何时设置为恢复？

Question

我一直在测试应用内购买的代码，但在调用 updatedTransactions SKPaymentTransactionObserver 委托方法时，我无法将交易状态设置为恢复。该方法何时以该事务状态调用？

func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) {

    for transaction in transactions {
        switch transaction.transactionState {
        // Call the appropriate custom method for the transaction state.
        case SKPaymentTransactionState.purchasing:
            showTransactionAsInProgress(transaction, deferred: false)
        case SKPaymentTransactionState.deferred:
            showTransactionAsInProgress(transaction, deferred: true)
        case SKPaymentTransactionState.failed:
            failedTransaction(transaction)
        case SKPaymentTransactionState.purchased:
            completeTransaction(transaction)
        case SKPaymentTransactionState.restored:
            restoreTransaction(transaction)
        }
    }

}

Answer 1

如果您在SKPaymentQueue 上调用restoreCompletedTransactions 并且用户有可恢复的应用内购买，您将获得恢复的交易。有关完整详细信息，请参阅reference documentation。