StoreKit的finishTransaction崩溃

Question

我们一直在iOS 9 iPhone 6上测试使用Xcode6.4编译的应用程序，但在完成应用程序内购买时发生了无法解释的崩溃。当在paymentQueue:updatedTransactions:回调中调用finishTransaction:时，我们会遇到这样的崩溃：

#0  0x0000000199eb8158 in objc_release ()
#1  0x0000000100cfc1d8 in +[TLStoreKitSource tlsw_finishTransaction:] ()
#2  0x0000000100402914 in -[InAppPurchaseHelper paymentQueue:updatedTransactions:] at VDPremiumSettingsWebViewController.m:105
#3  0x000000018a7746cc in __NotifyObserverAboutChanges ()
#4  0x00000001851947ec in CFArrayApplyFunction ()
#5  0x000000018a774648 in -[SKPaymentQueue _notifyObserversAboutChanges:sendUpdatedDownloads:] ()
#6  0x000000018a775150 in -[SKPaymentQueue _processUpdates:trimUnmatched:sendUpdatedDownloads:] ()
#7  0x000000018a775c58 in -[SKPaymentQueue _updatePaymentsForMessage:] ()
#8  0x000000018a7744f8 in __44-[SKPaymentQueue _handleMessage:connection:]_block_invoke ()
#9  0x00000001022a5d70 in _dispatch_call_block_and_release ()
#10 0x00000001022a5d30 in _dispatch_client_callout ()
#11 0x00000001022ab780 in _dispatch_main_queue_callback_4CF ()
#12 0x0000000185268258 in __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ ()
#13 0x00000001852660c0 in __CFRunLoopRun ()
#14 0x0000000185194dc0 in CFRunLoopRunSpecific ()
#15 0x00000001902e8088 in GSEventRunModal ()
#16 0x000000018a86ef60 in UIApplicationMain ()
#17 0x000000010006c338 in main at main.m:17
#18 0x000000019a6ca8b8 in start ()
Enqueued from com.apple.root.default-qos.overcommit (Thread 16)Queue : com.apple.root.default-qos.overcommit (serial)
#0  0x00000001022b032c in _dispatch_barrier_async_f ()
#1  0x000000018a77444c in -[SKPaymentQueue _handleMessage:connection:] ()
#2  0x000000019a8e130c in _xpc_connection_call_event_handler ()
#3  0x000000019a8df0b4 in _xpc_connection_mach_event ()
#4  0x00000001022a5e2c in _dispatch_client_callout4 ()
#5  0x00000001022aa39c in _dispatch_mach_msg_invoke ()
#6  0x00000001022b2a0c in _dispatch_queue_drain ()
#7  0x00000001022a93fc in _dispatch_mach_invoke ()
#8  0x00000001022a5d30 in _dispatch_client_callout ()
#9  0x00000001022b4f38 in _dispatch_root_queue_drain ()
#10 0x00000001022b4600 in _dispatch_worker_thread3 ()
#11 0x000000019a8ad478 in _pthread_wqthread ()
#12 0x000000019a8ad028 in start_wqthread ()

我不认为这个问题是在StoreKit中特别存在的，因为purchase在示例代码上工作得很好。我怀疑我们的角色会有很糟糕的副作用。我认为找到调用哪个对象objc_release可能会解决这个问题。但是，我不知道如何使用汇编代码找到它。

有没有人遇到过这种崩溃？有什么关于如何找到问题来源的提示吗？

作为参考，回调代码如下：

- (void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray *)transactions {
    for (SKPaymentTransaction *transaction in transactions) {
        switch (transaction.transactionState) {
            case SKPaymentTransactionStatePurchasing:
                break;

            case SKPaymentTransactionStateFailed:
                if (self.purchaseErrorBlock) {
                    self.purchaseErrorBlock(transaction.error);
                }
                [queue finishTransaction:transaction];
                break;

            case SKPaymentTransactionStatePurchased:
                if (self.purchaseSuccessBlock) {
                    self.purchaseSuccessBlock();
                }
                [queue finishTransaction:transaction];
                break;

            case SKPaymentTransactionStateDeferred:
                [queue finishTransaction:transaction];
                break;

            case SKPaymentTransactionStateRestored:
                [queue finishTransaction:transaction];
                break;
        }
    }
}

Answer 1

在finishTransaction中，描述是这样写的：

在处于购买状态的事务上调用finishTransaction(_:)时，

会抛出异常