了解用户在应用内购买时何时按下了取消按钮 [英] Knowing when user has pressed cancel buttons during In-App purchase

问题描述

我正在为应用内购买编写代码，并使用带有活动指示符的正在处理...视图，以便在启动购买时阻止立即购买按钮。但是，如果用户点击取消按钮，您怎么知道这些警报视图来自AppStore.app？

I am writing code for in-app purchases and using a "Processing..." view with an activity indicator to block the "Buy Now" button once a purchase is initiated. However, how can you tell when the user hits a "Cancel" button since those alert views are coming from the AppStore.app?

是否有按下取消按钮时调用的委托方法？或者您的观点再次成为 firstResponder ？我在这里缺少什么？

Is there a delegate method that gets called when those cancel buttons are pressed? Or is it a matter of your view becoming firstResponder again? What am I missing here?

如果您认为这不可行，请查看我是T-Pain应用程序......他们做了些什么非常相似，并在按下取消按钮后立即关闭他们的视图。

If you don't think this is possible, have a look at the "I Am T-Pain" app... they do something very similar and dismiss their view immediately after the cancel button is pressed.

替代文字http://i37.tinypic.com/1t4ead.png

推荐答案

假设一切都设置正确你应该有一个实现 SKPaymentTransactionObserver 的对象，它将收到交易成功/失败/取消的回调。

Assuming everything is setup correctly you should have an object implementing SKPaymentTransactionObserver which will receive callbacks for transaction success/failure/cancel.

在我的例子中它是此次调用中提到的 purchaseManager 对象

In my example it's the purchaseManager object mentioned in this call

  [[SKPaymentQueue defaultQueue] addTransactionObserver:purchaseManager];

当用户取消付款时，您应该收到一个交易状态为已取消的回调：

When the user cancels a payment you should receive a callback with a transaction state of cancelled:

- (void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray *)transactions {

        switch (transaction.transactionState)
        {
            case SKPaymentTransactionStatePurchased:
                [self completeTransaction:transaction];
                break;

            case SKPaymentTransactionStateFailed:
                // THIS IS THE STATE YOU SHOULD SEE
                [self failedTransaction:transaction];
                break;

                           ...
}

您可以使用此回调来关闭您的观点等......

You can use this callback to dismiss your view etc...

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