使用块会导致EXC_BAD_ACCESS
我想使用块，但在几次调用后它会导致我EXC_BAD_ACCESS。
我的代码：
- (void) sendBasket { if (currentSendToBasketBlock != nil) { // there's already a webservice going... set the new one as waiting waitingSendToBasketBlock = ^ { WebServicesModel *webServicesModel = [[[WebServicesModel alloc] init] autorelease]; webServicesModel.delegate = self; [webServicesModel sendBasketToServer:currentBasket]; [self showBasketBackground]; }; [waitingSendToBasketBlock copy]; } else { currentSendToBasketBlock = ^ { WebServicesModel *webServicesModel = [[[WebServicesModel alloc] init] autorelease]; webServicesModel.delegate = self; [webServicesModel sendBasketToServer:currentBasket]; [self showBasketBackground]; }; [currentSendToBasketBlock copy]; currentSendToBasketBlock(); } } Web服务完成后，它会在同一对象上调用特定方法：
- (void) specificMethod { if (waitingSendToBasketBlock != nil) { waitingSendToBasketBlock(); // here, the EXC_BAD_ACCESS happens waitingSendToBasketBlock = nil; } }
我错过了什么？ 乐器没有找到僵尸……
谢谢！
编辑：崩溃日志
Thread 0 name: Dispatch queue: com.apple.libdispatch-manager Thread 0: 0 libsystem_kernel.dylib 0x35590fbc kevent + 24 1 libdispatch.dylib 0x3525bed4 _dispatch_mgr_invoke + 744 2 libdispatch.dylib 0x3525cf3a _dispatch_queue_invoke + 70 3 libdispatch.dylib 0x3525c4ec _dispatch_worker_thread2 + 228 4 libsystem_c.dylib 0x3566758a _pthread_wqthread + 258 5 libsystem_c.dylib 0x35667bbc start_wqthread + 0 Thread 1 name: WebThread Thread 1: 0 libsystem_kernel.dylib 0x3558dc00 mach_msg_trap + 20 1 libsystem_kernel.dylib 0x3558d758 mach_msg + 44 2 CoreFoundation 0x309582b8 __CFRunLoopServiceMachPort + 88 3 CoreFoundation 0x3095a562 __CFRunLoopRun + 350 4 CoreFoundation 0x308eaebc CFRunLoopRunSpecific + 224 5 CoreFoundation 0x308eadc4 CFRunLoopRunInMode + 52 6 WebCore 0x35f5327e _ZL12RunWebThreadPv + 382 7 libsystem_c.dylib 0x3566630a _pthread_start + 242 8 libsystem_c.dylib 0x35667bb4 thread_start + 0 Thread 2: 0 libsystem_kernel.dylib 0x35591cb0 stat + 12 1 CFNetwork 0x34cccf56 DiskCookieStorage::syncStorageLocked() + 422 2 CFNetwork 0x34c3fa60 PrivateHTTPCookieStorage::syncStorage() + 20 3 CFNetwork 0x34ccaa7e HTTPCookieStorage::syncStorage() + 6 4 CFNetwork 0x34ccaa9c HTTPCookieStorage::_syncTimerFired(__CFRunLoopTimer*, void*) + 12 5 CoreFoundation 0x30957a40 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 8 6 CoreFoundation 0x30959ec4 __CFRunLoopDoTimer + 844 7 CoreFoundation 0x3095a83e __CFRunLoopRun + 1082 8 CoreFoundation 0x308eaebc CFRunLoopRunSpecific + 224 9 CoreFoundation 0x308eadc4 CFRunLoopRunInMode + 52 10 Foundation 0x341dd7f6 +[NSURLConnection(NSURLConnectionReallyInternal) _resourceLoadLoop:] + 206 11 Foundation 0x341d0382 -[NSThread main] + 38 12 Foundation 0x342425c6 __NSThread__main__ + 966 13 libsystem_c.dylib 0x3566630a _pthread_start + 242 14 libsystem_c.dylib 0x35667bb4 thread_start + 0 Thread 3 name: com.apple.CFSocket.private Thread 3: 0 libsystem_kernel.dylib 0x3558fc60 __select + 20 1 CoreFoundation 0x3095d8f2 __CFSocketManager + 582 2 libsystem_c.dylib 0x3566630a _pthread_start + 242 3 libsystem_c.dylib 0x35667bb4 thread_start + 0 Thread 4: 0 libsystem_kernel.dylib 0x3558dc00 mach_msg_trap + 20 1 libsystem_kernel.dylib 0x3558d758 mach_msg + 44 2 CoreFoundation 0x309582b8 __CFRunLoopServiceMachPort + 88 3 CoreFoundation 0x3095a562 __CFRunLoopRun + 350 4 CoreFoundation 0x308eaebc CFRunLoopRunSpecific + 224 5 CoreFoundation 0x3092d6d2 CFRunLoopRun + 42 6 MyProject 0x0011c41a +[ASIHTTPRequest runRequests] (ASIHTTPRequest.m:4773) 7 Foundation 0x341d0382 -[NSThread main] + 38 8 Foundation 0x342425c6 __NSThread__main__ + 966 9 libsystem_c.dylib 0x3566630a _pthread_start + 242 10 libsystem_c.dylib 0x35667bb4 thread_start + 0 Thread 5: 0 libsystem_kernel.dylib 0x355903ec __workq_kernreturn + 8 1 libsystem_c.dylib 0x356676d8 _pthread_wqthread + 592 2 libsystem_c.dylib 0x35667bbc start_wqthread + 0 Thread 6: 0 libsystem_kernel.dylib 0x355903ec __workq_kernreturn + 8 1 libsystem_c.dylib 0x356676d8 _pthread_wqthread + 592 2 libsystem_c.dylib 0x35667bbc start_wqthread + 0 Thread 7: 0 libsystem_kernel.dylib 0x355903ec __workq_kernreturn + 8 1 libsystem_c.dylib 0x356676d8 _pthread_wqthread + 592 2 libsystem_c.dylib 0x35667bbc start_wqthread + 0
您没有对副本执行任何操作，因此您仍在尝试访问存储在堆栈中的块。 请在copy电话的地方尝试此操作。
waitingSendToBasketBlock = Block_copy(waitingSendToBasketBlock); //and currentSendToBasketBlock = Block_copy(currentSendToBasketBlock);