ios - 解读 iOS 崩溃报告

Question

我遇到了多次崩溃，似乎 native iOS 方法正在从第三方库调用函数。这是一个例子:

Thread: Unknown Name (Crashed)
0     libsystem_kernel.dylib                0x33222350 __pthread_kill + 8 + 8
1     libsystem_c.dylib                     0x3500f973 abort + 95 + 94
2     libsystem_c.dylib                     0x34ff04d1 basename + 1
3     FireChat                              0x00036489 -[OTOverlayButton drawRect:] + 1
4     Foundation                            0x37a4a5a9 -[NSDictionary(NSKeyValueCoding) valueForKey:] + 33 + 32
5     FireChat                              0x709d -[NetworkModel getUserForUid:] (NetworkModel.m:150)
6     FireChat                              0x0001c42f -[OpenTokController session:didReceiveStream:] (OpenTokController.m:258)
7     libdispatch.dylib                     0x32da011f _dispatch_call_block_and_release + 11 + 10
8     libdispatch.dylib                     0x32d9f4b7 _dispatch_client_callout + 23 + 22
9     libdispatch.dylib                     0x32da41bd _dispatch_main_queue_callback_4CF$VARIANT$mp + 225 + 224
10   CoreFoundation                         0x37dbbf3b __CFRunLoopRun + 1291 + 1290
11   CoreFoundation                         0x37d2eebd CFRunLoopRunSpecific + 357 + 356
12   CoreFoundation                         0x37d2ed49 CFRunLoopRunInMode + 105 + 104
13   GraphicsServices                       0x358e22eb GSEventRunModal + 75 + 74
14   UIKit                                  0x3a1b42f9 UIApplicationMain + 1121 + 1120
15   FireChat                               0x43b3 main (main.m:8)

在我看来，[NSDictionary valueForKey:] 方法正在调用来自第三方库的[OTOverlayButton drawRect:]。这应该是不可能的——我是不是读错了崩溃报告？

[OTOverlayButton drawRect:] 在我的代码中没有被调用。请注意，字典包含(我的)对象，这些对象包含指向第三方库中对象的指针。

图书馆供应商和我都很困惑。

谢谢。

Answer 1

我认为这次崩溃的原因是由于调用 performSelector: 返回结构的方法导致的内存损坏。有关详细信息，请参阅此博客文章:

Why performSelector is more dangerous than I thought