objective-c - 解释崩溃日志 Objective C

Question

我正在尝试解释下面的崩溃日志，但我不确定我是否理解正确。 objc_msgSend() 表示我正在向已释放的对象发送消息。那么基本上数据源在表格 View 可以绘制其单元格之前就消失了？

如何找到此问题的原因？我尝试使用atos工具通过它返回的十六进制来查找崩溃的位置，但没有成功。

Exception Type:  EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000000000020
Crashed Thread:  0  Dispatch queue: com.apple.main-thread

Application Specific Information:
objc_msgSend() selector name: tableView:objectValueForTableColumn:row:


Thread 0 Crashed:  Dispatch queue: com.apple.main-thread
0   libobjc.A.dylib                 0x93f89ed7 objc_msgSend + 23
1   com.apple.AppKit                0x936143ea -[NSTableView preparedCellAtColumn:row:] + 335
2   com.apple.AppKit                0x9362e8bc -[NSTableView _drawContentsAtRow:column:withCellFrame:] + 56
3   com.apple.AppKit                0x9362d92a -[NSTableView drawRow:clipRect:] + 1131
4   com.apple.AppKit                0x9362d362 -[NSTableView drawRowIndexes:clipRect:] + 360
5   com.apple.AppKit                0x9362bd3b -[NSTableView drawRect:] + 1144
6   com.apple.AppKit                0x936218fd -[NSView _drawRect:clip:] + 3721
7   com.apple.AppKit                0x9361efc9 -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 2217
8   com.apple.AppKit                0x9361f95c -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 4668
9   com.apple.AppKit                0x9361f95c -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 4668
10  com.apple.AppKit                0x9361f95c -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 4668
11  com.apple.AppKit                0x9361f95c -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 4668
12  com.apple.AppKit                0x9361e55b -[NSThemeFrame _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 265
13  com.apple.AppKit                0x9361aea2 -[NSView _displayRectIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:] + 3309
14  com.apple.AppKit                0x9357ba57 -[NSView displayIfNeeded] + 818
15  com.apple.AppKit                0x93544d40 -[NSWindow displayIfNeeded] + 204
16  com.apple.AppKit                0x9357628a _handleWindowNeedsDisplay + 696
17  com.apple.CoreFoundation        0x94f0ae02 __CFRunLoopDoObservers + 1186
18  com.apple.CoreFoundation        0x94ec6d8d __CFRunLoopRun + 557
19  com.apple.CoreFoundation        0x94ec6464 CFRunLoopRunSpecific + 452
20  com.apple.CoreFoundation        0x94ec6291 CFRunLoopRunInMode + 97
21  com.apple.HIToolbox             0x94188004 RunCurrentEventLoopInMode + 392
22  com.apple.HIToolbox             0x94187cf7 ReceiveNextEventCommon + 158
23  com.apple.HIToolbox             0x94187c40 BlockUntilNextEventMatchingListInMode + 81
24  com.apple.AppKit                0x9354c78d _DPSNextEvent + 847
25  com.apple.AppKit                0x9354bfce -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 156
26  com.apple.AppKit                0x9350e247 -[NSApplication run] + 821
27  com.apple.AppKit                0x935062d9 NSApplicationMain + 574
28  ...yapp.com 0x00003032 0x1000 + 8242

Answer 1

Greg Parker 是一位 Objective-C 运行时工程师。他关于解释 objc_msgSend 崩溃的博客文章本质上是权威来源:http://www.sealiesoftware.com/blog/archive/2008/09/22/objc_explain_So_you_crashed_in_objc_msgSend.html 。

简短回答:您有一个内存损坏错误。