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在 Lion 中打开窗口时出现以下EXC_BAD_INSTRUCTION异常，但该应用程序在 Mountain Lion 中似乎运行良好。可能是什么问题？

Process:         MyApp [595]
Path:            /Users/USER/Desktop/MyApp.app/Contents/MacOS/MyApp
Identifier:      com.example.MyApp
Version:         ??? (0.4)
Code Type:       X86-64 (Native)
Parent Process:  launchd [146]

Date/Time:       2012-09-25 11:09:14.498 +0200
OS Version:      Mac OS X 10.7.3 (11D50d)
Report Version:  9
Sleep/Wake UUID: BA4DA964-60E8-4DC6-B63C-99435074A41C

Interval Since Last Report:          2901634 sec
Crashes Since Last Report:           367
Per-App Interval Since Last Report:  129923 sec
Per-App Crashes Since Last Report:   8
Anonymous UUID:                      BFF6E121-730D-4729-B07F-DA8550F46E14

Crashed Thread:  0  Dispatch queue: com.apple.main-thread

Exception Type:  EXC_BAD_INSTRUCTION (SIGILL)
Exception Codes: 0x0000000000000001, 0x0000000000000000

Application Specific Information:
objc[595]: garbage collection is OFF
objc[595]: cannot form weak reference to instance (0x7fc091666650) of class MyViewController
Performing @selector(startPressed:) from sender NSButton 0x7fc09167d210

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   libobjc.A.dylib                0x00007fff91496768 _objc_trap + 4
1   libobjc.A.dylib                0x00007fff914968aa _objc_fatal + 195
2   libobjc.A.dylib                0x00007fff914a24ad weak_register_no_lock + 346
3   libobjc.A.dylib                0x00007fff914a2a59 objc_storeWeak + 360
4   com.apple.CoreFoundation       0x00007fff8f29c75d -[NSObject performSelector:withObject:] + 61
5   com.apple.AppKit               0x00007fff94bb5392 -[NSNibOutletConnector establishConnection] + 405
6   com.apple.AppKit               0x00007fff94bb2a89 -[NSIBObjectData nibInstantiateWithOwner:topLevelObjects:] + 107
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1 回答 1

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找到了。问题是我已经声明了一个委托id属性weak并为其分配了一个NSVieWcontroller。

显然，如果您想支持 Lion 并确保安全，则永远不应将id属性声明为weak. 从过渡到ARC 发行说明：

注意：此外，在 OS X v10.7 中，您不能创建对 NSFontManager、NSFontPanel、NSImage、NSTableCellView、NSViewController、NSWindow 和 NSWindowController 实例的弱引用。此外，在 OS X v10.7 中，AV Foundation 框架中没有类支持弱引用。

解决方法：assign改用。

@property (nonatomic, assign) IBOutlet id<MyDelegateProtocol> delegate;
于 2012-09-25T10:32:19.737 回答