我的某个应用的几个用户发生了随机崩溃。崩溃日志不包含对我自己编写的方法的任何引用，因此很难阅读。崩溃也很难重现，所以我不能使用NSZombieEnabled这样的工具来获取更多信息。
基于崩溃报告（见下文）我假设这是因为我的应用程序的NSWindow对象被请求（或通知）以动画方式调整大小（因此，计时器和延迟信息）但是有一个按钮（NSButton）这导致了一个问题（可能是因为我有一个SIGSEGV而被解除分配）。但是，我不明白为什么原因是“在当前参数寄存器中找到选择器名称：methodForSelector：”。
您是否可以从此崩溃日志中了解更多有用信息，以便了解导致此问题的原因？
Exception Type: SIGSEGV
Exception Codes: SEGV_MAPERR at 0x295eeda4bec0
Crashed Thread: 0
Application Specific Information:
Selector name found in current argument registers: methodForSelector:
Thread 0 Crashed:
0 libobjc.A.dylib 0x00007fff848c70dd objc_msgSend + 29
1 AppKit 0x00007fff833a6aef safeARCWeaklyStore + 113
2 AppKit 0x00007fff833b2a5b -[NSActionCell setTarget:] + 99
3 AppKit 0x00007fff83610de1 -[NSActionCell copyWithZone:] + 285
4 AppKit 0x00007fff83611157 -[NSButtonCell copyWithZone:] + 98
5 AppKit 0x00007fff8360f81b -[NSButton baselineOffsetFromBottom] + 370
6 AppKit 0x00007fff835289c6 -[NSView(NSConstraintBasedLayout) nsli_lowerAttribute:intoExpression:withCoefficient:forConstraint:] + 750
7 Foundation 0x00007fff8b86f003 lower_1_attribute + 157
8 Foundation 0x00007fff8b86e9e6 -[NSLayoutConstraint _lowerIntoExpression:reportingConstantIsRounded:] + 101
9 Foundation 0x00007fff8b86e686 -[NSLayoutConstraint _containerGeometryDidChange] + 87
10 AppKit 0x00007fff8341b8c6 _NSViewEnumerateConstraints + 252
11 AppKit 0x00007fff8352854b __52-[NSView(NSConstraintBasedLayout) _setLayoutEngine:]_block_invoke_2 + 322
12 Foundation 0x00007fff8b86e48e -[NSISEngine withBehaviors:performModifications:] + 154
13 AppKit 0x00007fff833ca1aa -[NSView(NSConstraintBasedLayout) _withAutomaticEngineOptimizationDisabled:] + 69
14 AppKit 0x00007fff835283e8 __52-[NSView(NSConstraintBasedLayout) _setLayoutEngine:]_block_invoke + 481
15 AppKit 0x00007fff83401bcf -[NSView(NSConstraintBasedLayout) _setLayoutEngine:] + 232
16 AppKit 0x00007fff835284e0 __52-[NSView(NSConstraintBasedLayout) _setLayoutEngine:]_block_invoke_2 + 215
17 Foundation 0x00007fff8b86e48e -[NSISEngine withBehaviors:performModifications:] + 154
18 AppKit 0x00007fff833ca1aa -[NSView(NSConstraintBasedLayout) _withAutomaticEngineOptimizationDisabled:] + 69
19 AppKit 0x00007fff835283e8 __52-[NSView(NSConstraintBasedLayout) _setLayoutEngine:]_block_invoke + 481
20 AppKit 0x00007fff83401bcf -[NSView(NSConstraintBasedLayout) _setLayoutEngine:] + 232
21 AppKit 0x00007fff835284e0 __52-[NSView(NSConstraintBasedLayout) _setLayoutEngine:]_block_invoke_2 + 215
22 Foundation 0x00007fff8b86e48e -[NSISEngine withBehaviors:performModifications:] + 154
23 AppKit 0x00007fff833ca1aa -[NSView(NSConstraintBasedLayout) _withAutomaticEngineOptimizationDisabled:] + 69
24 AppKit 0x00007fff835283e8 __52-[NSView(NSConstraintBasedLayout) _setLayoutEngine:]_block_invoke + 481
25 AppKit 0x00007fff83401bcf -[NSView(NSConstraintBasedLayout) _setLayoutEngine:] + 232
26 AppKit 0x00007fff835284e0 __52-[NSView(NSConstraintBasedLayout) _setLayoutEngine:]_block_invoke_2 + 215
27 Foundation 0x00007fff8b86e48e -[NSISEngine withBehaviors:performModifications:] + 154
28 AppKit 0x00007fff833ca1aa -[NSView(NSConstraintBasedLayout) _withAutomaticEngineOptimizationDisabled:] + 69
29 AppKit 0x00007fff835283e8 __52-[NSView(NSConstraintBasedLayout) _setLayoutEngine:]_block_invoke + 481
30 AppKit 0x00007fff83401bcf -[NSView(NSConstraintBasedLayout) _setLayoutEngine:] + 232
31 AppKit 0x00007fff835281df make_and_host_engine + 248
32 AppKit 0x00007fff83ced3ce -[NSView(NSConstraintBasedLayout) _rebuildLayoutFromScratch] + 134
33 AppKit 0x00007fff83b6fd91 -[NSWindow _setWindowResolution:displayIfChanged:] + 279
34 AppKit 0x00007fff83739361 -[NSWindow _updateInheritedBackingScaleFactorAndDisplayIfChanged:] + 131
35 AppKit 0x00007fff83609237 __67-[NSWindow _updateSettingsSendingScreenChangeNotificationIfNeeded:]_block_invoke + 193
36 AppKit 0x00007fff83482bdb NSPerformWithScreenUpdatesDisabled + 64
37 AppKit 0x00007fff8346c4c6 -[NSWindow _updateSettingsSendingScreenChangeNotificationIfNeeded:] + 365
38 AppKit 0x00007fff83469b54 -[NSWindow _setFrame:updateBorderViewSize:] + 1098
39 AppKit 0x00007fff8346912c -[NSWindow _oldPlaceWindow:] + 1117
40 AppKit 0x00007fff8346851d -[NSWindow _setFrameCommon:display:stashSize:] + 2561
41 AppKit 0x00007fff83560be3 -[NSWindow setValue:forKey:] + 180
42 Foundation 0x00007fff8b84f9d1 -[NSObject(NSKeyValueCoding) setValue:forKeyPath:] + 338
43 AppKit 0x00007fff8365c926 _NSStopAnimation + 98
44 AppKit 0x00007fff8365c1fb __40+[NSAnimationManager performAnimations:]_block_invoke_2 + 756
45 AppKit 0x00007fff83482bdb NSPerformWithScreenUpdatesDisabled + 64
46 AppKit 0x00007fff8365beff __40+[NSAnimationManager performAnimations:]_block_invoke + 129
47 AppKit 0x00007fff8365ba66 +[NSAnimationManager performAnimations:] + 1155
48 AppKit 0x00007fff8358cbf6 -[NSScreenDisplayLink _fire] + 398
49 CoreFoundation 0x00007fff8d76b2e4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 19
50 CoreFoundation 0x00007fff8d76af73 __CFRunLoopDoTimer + 1058
51 CoreFoundation 0x00007fff8d7de53d __CFRunLoopDoTimers + 300
52 CoreFoundation 0x00007fff8d726608 __CFRunLoopRun + 2023
53 CoreFoundation 0x00007fff8d725bd8 CFRunLoopRunSpecific + 295
54 HIToolbox 0x00007fff8fc4356f RunCurrentEventLoopInMode + 234
55 HIToolbox 0x00007fff8fc432ea ReceiveNextEventCommon + 430
56 HIToolbox 0x00007fff8fc4312b _BlockUntilNextEventMatchingListInModeWithFilter + 70
57 AppKit 0x00007fff834278ab _DPSNextEvent + 977
58 AppKit 0x00007fff83426e58 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 345
59 AppKit 0x00007fff8341caf3 -[NSApplication run] + 593
60 AppKit 0x00007fff83399244 NSApplicationMain + 1831
61 libdyld.dylib 0x00007fff891e25c9 start + 0
Thread 0 crashed with X86-64 Thread State:
rip: 0x00007fff848c70dd rbp: 0x00007fff57ac7fd0 rsp: 0x00007fff57ac7f98 rax: 0x0000000000000001
rbx: 0x00007fff83d68df7 rcx: 0x00007fff833a7973 rdx: 0x00007fff83d68df7 rdi: 0x000060000011a820
rsi: 0x00007fff83d66b5c r8: 0x0000000000000000 r9: 0xffffffffffffffff r10: 0x00007fff83d66b5c
r11: 0x0000295eeda4bea8 r12: 0x000060000011a820 r13: 0x00007fff848c70c0 r14: 0x00006000002e2d28
r15: 0x0000000000000000 rflags: 0x0000000000010202 cs: 0x000000000000002b fs: 0x0000000000000000
gs: 0x0000000000000000
谢谢！
答案 0 :(得分：1)
Xcode 6+有一个很棒的功能，可以列出用户崩溃并在你的iphone或模拟器中重新模拟它们来检查它...希望它有助于你或者你必须以艰难的方式去追踪它们的去除＆＃34;去神秘化＆ ＃34;
http://www.raywenderlich.com/23704/demystifying-ios-application-crash-logs
答案 1 :(得分：0)
我不是专家，但这是我的猜测......
-[NSWindow _updateInheritedBackingScaleFactorAndDisplayIfChanged:]
...也许屏幕分辨率刚刚改变了？例如，用户在“系统偏好设置”中进行了更改＆gt;显示，或者可能将应用程序的窗口从非视网膜拖到视网膜显示器上？
Selector name found in current argument registers: methodForSelector:
Thread 0 Crashed:
objc_msgSend
safeARCWeaklyStore
-[NSActionCell setTarget:]
-[NSActionCell copyWithZone:]
-[NSButtonCell copyWithZone:]
-[NSButton baselineOffsetFromBottom]
-[NSView(NSConstraintBasedLayout) nsli_lowerAttribute:intoExpression:withCoefficient:forConstraint:]
...自动布局重新计算布局，并在应用中向NSButton询问了baselineOffsetFromBottom。这导致按钮要求NSButtonCell的副本（我不知道为什么）。在制作副本时，NSButtonCell尝试设置副本的target，但此处存在问题。也许是使用methodForSelector:来读取目标地址以便将其写入副本？
你是否有可能没有设定目标的NSButton？或者它被声明为weak，而strong在这里是必要的吗？
我希望大部分都是错的，但也许这有助于思考过程......祝你好运......