RestoreCompletedTransactions() 没有调用 paymentQueue UpdatedTransactions？

Question

我在 Swift 4/iOS 11 中恢复 IAP 时遇到问题。我的AppDelegate实现SKPaymentTransactionObserver. AppDelegate我正在didFinishLaunchingWithOptions打电话SKPaymentQueue.default().add(self)。我paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction])也在 AppDelegate 中实现了该功能。

我可以ViewController像这样进行购买：

let payment = SKPayment(product: products.first!)
SKPaymentQueue.default().add(payment)

购买成功完成 - 我在观察者中得到了updatedTransactionwith 状态。.purchasedpaymentQueue

但是，当我从中调用以下内容ViewController以恢复购买时：

SKPaymentQueue.default().restoreCompletedTransactions()

该paymentQueue updatedTransactions函数从未被调用。

看来我的沙箱用户等设置正确，因为初始购买正在运行。沙盒用户有能力恢复购买吗？restoreCompletedTransactions()除了打电话恢复购买之外，我还需要做任何额外的工作吗？

---

更新，这是我的paymentQueue updatedTransactions代码AppDelegate：

func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) {
    for transaction in transactions{
        switch transaction.transactionState{
        case .purchased:
            debugPrint("purchased it!")
            menuDelegate?.unlockMenu()
            //unlock the content, then
            SKPaymentQueue.default().finishTransaction(transaction)
            break
        case .failed:
            debugPrint("failed")
            SKPaymentQueue.default().finishTransaction(transaction)
            break
        case .restored:
            debugPrint("restored")
            menuDelegate?.unlockMenu()
            //unlock the content, then
            SKPaymentQueue.default().finishTransaction(transaction)
            break
        case .purchasing:
            debugPrint("purchasing...")
            break
        case .deferred:
            debugPrint("deferred...")
            break
        }
    }
}