是什么导致了这次崩溃？
最近，当使用 NSNotificationCenter 发布通知时，我遇到了由于找不到选择器而导致的崩溃。什么可能导致此错误？
我注意到在发布通知后没有调用任何用户代码，因此这在通知的接收端似乎不是问题。然而，什么可能导致 NSNotificationCenter 崩溃呢？
这是调用的堆栈跟踪：
0 libSystem.B.dylib 0x00078ac8 __kill + 8
1 libSystem.B.dylib 0x00078ab8 kill + 4
2 libSystem.B.dylib 0x00078aaa raise + 10
3 libSystem.B.dylib 0x0008d03a abort + 50
4 libstdc++.6.dylib 0x00044a20 __gnu_cxx::__verbose_terminate_handler() + 376
5 libobjc.A.dylib 0x00005958 _objc_terminate + 104
6 libstdc++.6.dylib 0x00042df2 __cxxabiv1::__terminate(void (*)()) + 46
7 libstdc++.6.dylib 0x00042e46 std::terminate() + 10
8 libstdc++.6.dylib 0x00042f16 __cxa_throw + 78
9 libobjc.A.dylib 0x00004838 objc_exception_throw + 64
10 CoreFoundation 0x000a167c -[NSObject(NSObject) doesNotRecognizeSelector:] + 96
11 CoreFoundation 0x000491d2 ___forwarding___ + 502
12 CoreFoundation 0x00048f88 _CF_forwarding_prep_0 + 40
13 Foundation 0x000146ac _nsnote_callback + 136
14 CoreFoundation 0x0002670c __CFXNotificationPost_old + 396
15 CoreFoundation 0x000263ac _CFXNotificationPostNotification + 112
16 Foundation 0x0000b014 -[NSNotificationCenter postNotification:] + 132
17 [My Application] 0x000a5ad2 -[PortfolioUpdateOperation main] (PortfolioUpdateOperation.m:37)
18 Foundation 0x0000e9e8 -[__NSOperationInternal start] + 652
19 Foundation 0x0000e74c -[NSOperation start] + 16
20 Foundation 0x00023574 ____startOperations_block_invoke_2 + 40
21 libSystem.B.dylib 0x000d597c _dispatch_call_block_and_release + 12
22 libSystem.B.dylib 0x000d675c _dispatch_worker_thread2 + 120
23 libSystem.B.dylib 0x0007a67a _pthread_wqthread + 258
24 libSystem.B.dylib 0x00073190 start_wqthread + 0
I've recently had a crash concerning a selector not being found when a notification was posted using NSNotificationCenter. What can be causing this error?
I've noticed that there was no user code being called after the notification was posted, so that doesn't seem to be a problem on the receiving side of the notification. However, what could cause NSNotificationCenter to crash?
Here's the stack trace of the call:
0 libSystem.B.dylib 0x00078ac8 __kill + 8
1 libSystem.B.dylib 0x00078ab8 kill + 4
2 libSystem.B.dylib 0x00078aaa raise + 10
3 libSystem.B.dylib 0x0008d03a abort + 50
4 libstdc++.6.dylib 0x00044a20 __gnu_cxx::__verbose_terminate_handler() + 376
5 libobjc.A.dylib 0x00005958 _objc_terminate + 104
6 libstdc++.6.dylib 0x00042df2 __cxxabiv1::__terminate(void (*)()) + 46
7 libstdc++.6.dylib 0x00042e46 std::terminate() + 10
8 libstdc++.6.dylib 0x00042f16 __cxa_throw + 78
9 libobjc.A.dylib 0x00004838 objc_exception_throw + 64
10 CoreFoundation 0x000a167c -[NSObject(NSObject) doesNotRecognizeSelector:] + 96
11 CoreFoundation 0x000491d2 ___forwarding___ + 502
12 CoreFoundation 0x00048f88 _CF_forwarding_prep_0 + 40
13 Foundation 0x000146ac _nsnote_callback + 136
14 CoreFoundation 0x0002670c __CFXNotificationPost_old + 396
15 CoreFoundation 0x000263ac _CFXNotificationPostNotification + 112
16 Foundation 0x0000b014 -[NSNotificationCenter postNotification:] + 132
17 [My Application] 0x000a5ad2 -[PortfolioUpdateOperation main] (PortfolioUpdateOperation.m:37)
18 Foundation 0x0000e9e8 -[__NSOperationInternal start] + 652
19 Foundation 0x0000e74c -[NSOperation start] + 16
20 Foundation 0x00023574 ____startOperations_block_invoke_2 + 40
21 libSystem.B.dylib 0x000d597c _dispatch_call_block_and_release + 12
22 libSystem.B.dylib 0x000d675c _dispatch_worker_thread2 + 120
23 libSystem.B.dylib 0x0007a67a _pthread_wqthread + 258
24 libSystem.B.dylib 0x00073190 start_wqthread + 0
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NSNotificationCenter 很可能正在尝试通知不再存在的对象实例。
换句话说，对象被释放时没有将其本身作为 NSNotificationCenter 观察者删除。检查代码中是否有对象将自身添加为 NSNotificationCenter 观察者但无法从 NSNotificationCenter 中删除自身的情况。
Most likely NSNotificationCenter is trying to notify an object instance that no longer exists.
In other words, an object was deallocated without removing itself as a NSNotificationCenter observer. Check your code for cases when an object adds itself as a NSNotificationCenter observer but fails to remove itself from NSNotificationCenter.
看起来您添加了一个对象作为观察者，但它不响应您提供的选择器。确保您的通知方法接受一个
NSNotification类型的参数Looks like you added an object as an observer that doesn't respond to the selector you provided. Make sure your notification method accepts one argument of type
NSNotification也许检查
respondsToSelector然后记录对象的类名等可以进一步帮助您？Maybe a check to
respondsToSelectorfollowed with some logging of the object's class name etc could help you further?