Iphone 追根究底

我有以下崩溃，我无法按需复制，但确实发生了足以引起用户注意的事件

这一事故报告也被符号化了。你将如何找出原因！！！这似乎只发生在4.1上

Exception Type:  SIGSEGV
Exception Codes: SEGV_ACCERR at 0x9f069184
Crashed Thread:  0

Thread 0 Crashed:
0   libobjc.A.dylib                     0x000027d8 objc_msgSend + 16
1   CoreFoundation                      0x0007d749 ____CFXNotificationPost_old_block_invoke_1 + 45
2   libSystem.B.dylib                   0x000d5984 _dispatch_call_block_and_release + 20
3   libSystem.B.dylib                   0x000d66b0 _dispatch_continuation_pop + 72
4   libSystem.B.dylib                   0x000d69fc _dispatch_main_queue_callback_4CF + 220
5   CoreFoundation                      0x0002789b __CFRunLoopRun + 1335
6   CoreFoundation                      0x00027277 CFRunLoopRunSpecific + 231
7   CoreFoundation                      0x0002717f CFRunLoopRunInMode + 59
8   GraphicsServices                    0x000045f3 GSEventRunModal + 115
9   GraphicsServices                    0x0000469f GSEventRun + 63
10  UIKit                               0x00004123 -[UIApplication _run] + 403
11  UIKit                               0x0000212f UIApplicationMain + 671
12  MyApp                               0x000024e3 main (main.m:17)

从那以后，我设法获得了更多的信息，但不多

2012-02-12 18:03:04.556 MyApp[462:307] (null): unrecognized selector sent to class 0x3e0a360c
2012-02-12 18:03:04.618 MyApp[462:307] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '(null): unrecognized selector sent to class 0x3e0a360c'
*** Call stack at first throw:
(
    0   CoreFoundation                      0x33506ed3 __exceptionPreprocess + 114
    1   libobjc.A.dylib                     0x30412811 objc_exception_throw + 24
    2   CoreFoundation                      0x335086ff +[NSObject(NSObject) doesNotRecognizeSelector:] + 102
    3   CoreFoundation                      0x334b01d9 ___forwarding___ + 508
    4   CoreFoundation                      0x334aff90 _CF_forwarding_prep_0 + 48
    5   Foundation                          0x302a86b3 _nsnote_callback + 142
    6   CoreFoundation                      0x334e4749 ____CFXNotificationPost_old_block_invoke_1 + 44
    7   libSystem.B.dylib                   0x31d05984 _dispatch_call_block_and_release + 20
    8   libSystem.B.dylib                   0x31d066b0 _dispatch_continuation_pop + 72
    9   libSystem.B.dylib                   0x31d069fc _dispatch_main_queue_callback_4CF + 220
    10  CoreFoundation                      0x3348e89b __CFRunLoopRun + 1334
    11  CoreFoundation                      0x3348e277 CFRunLoopRunSpecific + 230
    12  CoreFoundation                      0x3348e17f CFRunLoopRunInMode + 58
    13  GraphicsServices                    0x31b5e5f3 GSEventRunModal + 114
    14  GraphicsServices                    0x31b5e69f GSEventRun + 62
    15  UIKit                               0x341bd123 -[UIApplication _run] + 402
    16  UIKit                               0x341bb12f UIApplicationMain + 670

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现在我所有的AddObservators都是基于块的，所以我不明白为什么会导致无法识别的选择器。

这种方法在调试崩溃时帮不了我们多少忙。我找到了调试代码以防崩溃的最佳方法之一。请遵循调试技术的链接：

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您需要非常仔细地分析控制台，以了解崩溃发生的实际原因。这对我几乎所有没有启用ARC的代码都有帮助。

我不知道，所以我没有发布答案，但它似乎在试图调用一个已经发布的块？不确定这是否是原因，但我会检查我是否作为观察者删除对象（到NSNotificationCenter）在解除分配之前。您的崩溃仅仅是因为NSN通知，是吗？试着注释掉代码并运行。问题是哪个/哪里！一点也不清楚！