iPhone - SKProductsRequest和“发送到解除分配的实例的消息” [英] iPhone - SKProductsRequest and "message sent to deallocated instance"

问题描述

我遇到了实施InAppPurchase的麻烦。我的购买实现是在模态视图控制器（AppUpgradeViewController）中，我从另一个模态视图中呈现。我是这样做的：

I got troubles implementing InAppPurchase. My implementation of purchase is in modal view controller (AppUpgradeViewController), that I present from another modal view. I do it like this:

AppUpgradeViewController * appUpgradeViewController = [[AppUpgradeViewController alloc] init];
appUpgradeViewController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
appUpgradeViewController.delegate = self;
[self presentModalViewController:appUpgradeViewController animated:YES];
[appUpgradeViewController release];

然后，在我的升级视图中，我执行以下操作：

Then, in my upgrade view I do the following:

[[SKPaymentQueue defaultQueue] addTransactionObserver:self];
NSSet *productIdentifiers = [NSSet setWithObject:kInAppPurchaseProUpgradeProductId];
self.productsRequest = [[SKProductsRequest alloc] initWithProductIdentifiers:productIdentifiers];
self.productsRequest.delegate = self;
[productsRequest start];

然后我实施了

- (void)productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response

我在哪里：

[self.productsRequest release];

然后我还有其他必需的方法。

and then I have other required methods.

问题是当我显示模态时，并迅速解除它然后几秒后我在控制台上得到以下内容（我打开了NSZombieEnabled）：

The problem is when I show modal, and quickly dismiss it then after few seconds i got the following on console (I turned on NSZombieEnabled):

*** -[AppUpgradeViewController respondsToSelector:]: message sent to deallocated instance 0x2e91f0

我想这是产品请求的内容，但我不知道如何调试或修复它。似乎请求的答案是在它被解除（并且被解除分配）之后才到达该控制器，但是我不知道在解除/ dealloc之后如何阻止它接收消息。
感谢您的帮助！

I suppose that it's something with that product request, but I don't know how to debug or fix it. It seems that the answer for request comes to this controller just after it's dismissed (and deallocated), but I don't know how to prevent it from receiving messages after dismiss/dealloc. Thanks for any help!

推荐答案

我遇到了同样的问题。不是模态视图，而是导航控制器堆栈上的推入视图。当我在通过 SKProductsRequest 加载产品信息之前快速导航回来时，它还会向我发送一个消息，发送到解除分配的实例例外。我通过调用 cancel 方法解决了这个问题（参见参考。

I had the same problem. Not with a modal view, but with a pushed view on the navigation controller stack. When I quickly navigated back before my product information was loaded via SKProductsRequest, it also throws me an message sent to deallocated instance exception. I solved this by calling the cancel method (see reference) on my SKProductsRequest object.

除此之外，我还将代表设置为 nil 。

Additional to this I also set the delegate to nil.

这是我的产品请求：

NSSet *productIdentifiers = [NSSet setWithObject:@"MY_IDENTIFIER"];
SKProductsRequest *productsRequest = [[SKProductsRequest alloc] initWithProductIdentifiers:productIdentifiers];
productsRequest.delegate = self;
[productsRequest start];

这是我在dealloc方法中用来取消它的方法。

and this is what I called in the dealloc method to cancel it.

productsRequest.delegate = nil;
[productsRequest cancel];
productsRequest = nil;

我还从 SKPaymentQueue 中删除​​了观察者如另一个问题的答案中所述。

I also removed the observer from the SKPaymentQueue like described in this answer for another question.

[[SKPaymentQueue defaultQueue] removeTransactionObserver:self];

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