问题描述
我使用以下代码根据应用内购买编程指南请求产品列表。它曾经在我的iPhone应用程序工作良好，但现在它崩溃，每次请求产品列表。委托方法（void）productsRequest：（SKProductsRequest **）request didReceiveResponse：（SKProductsResponse **）response 从未调用。
I use the following code to request a list of products as per the In-App Purchase Programming Guide. It used to work fine in my iPhone application, however now it crashes every time the product list is requested. The delegate method (void)productsRequest:(SKProductsRequest **)request didReceiveResponse:(SKProductsResponse **)response is never called.
SKProductsRequest *request = [[SKProductsRequest alloc] initWithProductIdentifiers:[NSSet setWithObject:@"my.product.identifier"]];
[request setDelegate:self];
[request start];
正如我所说，它工作得很好，然后停止工作。这是在调用上述代码时发生的崩溃。
As I said, it worked perfectly fine, then just stopped working. This is the crash which occurs when the above code is called.
Exception Type: EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x00000011
Crashed Thread: 0
Thread 0 Crashed:
0 libobjc.A.dylib 0x000034f8 objc_msgSend + 24
1 StoreKit 0x00003e18 -[SKProductsRequest handleFinishResponse:returningError:] + 40
2 StoreKit 0x000050c4 -[SKRequest _requestFinishedNotification:] + 152
3 Foundation 0x00019b9a _nsnote_callback + 150
4 CoreFoundation 0x0006c2de __CFXNotificationPost_old + 390
5 CoreFoundation 0x0001ab32 _CFXNotificationPostNotification + 122
6 Foundation 0x000048e4 -[NSNotificationCenter postNotificationName:object:userInfo:] + 64
7 AppSupport 0x0000bb42 -[CPDistributedNotificationCenter deliverNotification:userInfo:] + 38
8 AppSupport 0x0000cf66 _CPDNDeliverNotification + 198
9 AppSupport 0x0000ba4a _XDeliverNotification + 110
10 AppSupport 0x00002e82 migHelperRecievePortCallout + 122
11 CoreFoundation 0x000742ac __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 22
12 CoreFoundation 0x000761d6 __CFRunLoopDoSource1 + 158
13 CoreFoundation 0x0007718e __CFRunLoopRun + 574
14 CoreFoundation 0x0001e0bc CFRunLoopRunSpecific + 220
15 CoreFoundation 0x0001dfca CFRunLoopRunInMode + 54
16 GraphicsServices 0x00003f88 GSEventRunModal + 188
17 UIKit 0x00007b40 -[UIApplication _run] + 564
18 UIKit 0x00005fb8 UIApplicationMain + 964
19 myapp 0x00002fae main (main.m:13)
20 myapp 0x00002f58 start + 32
Thread 1:
0 libSystem.B.dylib 0x00034e84 kevent + 24
1 libSystem.B.dylib 0x00102a48 _dispatch_mgr_invoke + 88
2 libSystem.B.dylib 0x00102494 _dispatch_queue_invoke + 96
3 libSystem.B.dylib 0x00102634 _dispatch_worker_thread2 + 120
4 libSystem.B.dylib 0x0008b53c _pthread_wqthread + 392
5 libSystem.B.dylib 0x00082b6c start_wqthread + 0
Thread 2:
0 libSystem.B.dylib 0x00000ab0 mach_msg_trap + 20
1 libSystem.B.dylib 0x00002f94 mach_msg + 60
2 CoreFoundation 0x00074b18 __CFRunLoopServiceMachPort + 88
3 CoreFoundation 0x000770e0 __CFRunLoopRun + 400
4 CoreFoundation 0x0001e0bc CFRunLoopRunSpecific + 220
5 CoreFoundation 0x0001dfca CFRunLoopRunInMode + 54
6 WebCore 0x0000370c RunWebThread(void*) + 552
7 libSystem.B.dylib 0x0008af80 _pthread_start + 364
8 libSystem.B.dylib 0x0007d014 thread_start + 0
Thread 3:
0 libSystem.B.dylib 0x00000ab0 mach_msg_trap + 20
1 libSystem.B.dylib 0x00002f94 mach_msg + 60
2 CoreFoundation 0x00074b18 __CFRunLoopServiceMachPort + 88
3 CoreFoundation 0x000770e0 __CFRunLoopRun + 400
4 CoreFoundation 0x0001e0bc CFRunLoopRunSpecific + 220
5 CoreFoundation 0x0001dfca CFRunLoopRunInMode + 54
6 Foundation 0x0003c316 +[NSURLConnection(NSURLConnectionReallyInternal) _resourceLoadLoop:] + 210
7 Foundation 0x0000c612 -[NSThread main] + 42
8 Foundation 0x00092140 __NSThread__main__ + 908
9 libSystem.B.dylib 0x0008af80 _pthread_start + 364
10 libSystem.B.dylib 0x0007d014 thread_start + 0
Thread 4:
0 libSystem.B.dylib 0x00029f24 select$DARWIN_EXTSN + 20
1 CoreFoundation 0x0007aa54 __CFSocketManager + 340
2 libSystem.B.dylib 0x0008af80 _pthread_start + 364
3 libSystem.B.dylib 0x0007d014 thread_start + 0
我不知道是什么导致objc_msgSend崩溃，与StoreKit相关。我也不知道我添加或更改了什么导致这个简单的代码停止工作。
I don't know what is causing the objc_msgSend crash, or how it is related to StoreKit. I also have no idea what I added or changed which caused this simple code to stop working.
推荐答案
很可能的解释是您设置为SKProductRequest对象的委托的对象可能已经被释放。
A very likely explanation is whether the object you set as a delegate for the SKProductRequest object might have been deallocated already.
请求可能需要几秒钟才能完成，这可能超过代理对象的生命周期，因此您可能需要确保它停留足够长时间。
It is quite possible for the request to take a few seconds to complete, and this might be past the lifetime of your delegate object, so you may want to make sure it sticks around for long enough.
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