iphone - StoreKit SKProducts请求崩溃

Question

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 应用程序中运行良好，但现在每次请求产品列表时都会崩溃。永远不会调用委托(delegate)方法 (void)productsRequest:(SKProductsRequest **)request didReceiveResponse:(SKProductsResponse **)response。

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，然后就停止工作了。这是调用上述代码时发生的崩溃。

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

我不知道是什么原因导致 objc_msgSend 崩溃，也不知道它与 StoreKit 有何关系。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。

Answer 1

一个很可能的解释是，您设置为 SKProductRequest 对象委托(delegate)的对象是否可能已被释放。

请求很可能需要几秒钟才能完成，这可能超出了委托(delegate)对象的生命周期，因此您可能需要确保它保留足够长的时间。