【发布时间】：2011-06-13 00:12:14
【问题描述】：
我在核心数据方面遇到了一个奇怪的错误。当我尝试访问核心数据对象时，我的应用有时会崩溃，但并非总是如此。
它经常在 iPhone 3 上发生，有时只在 iPhone 4 上发生。我查看了我的设备日志并将其缩小到核心数据问题。日志引用的行如下，tripInstructor 是一个核心数据对象，它是 AppManager 类的一个属性。不确定这是否有很大的不同，但我确实将该属性声明为“非原子的，保留”。
感谢您的建议
[self.supervisorLbl setText:[AppManager sharedAppManager].tripInstructor.name];
Date/Time: 2011-06-12 20:55:24.865 +1000
OS Version: iPhone OS 4.3.3 (8J2)
Report Version: 104
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x00000000, 0x00000000
Crashed Thread: 0
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 libsystem_kernel.dylib 0x33e8da1c pthread_kill + 8
1 libsystem_c.dylib 0x35e5b3b4 pthread_kill + 52
2 libsystem_c.dylib 0x35e53bf8 abort + 72
3 libstdc++.6.dylib 0x33508a64 __gnu_cxx::__verbose_terminate_handler() + 376
4 libobjc.A.dylib 0x33f1106c _objc_terminate + 104
5 libstdc++.6.dylib 0x33506e36 _cxxabiv1::_terminate(void (*)()) + 46
6 libstdc++.6.dylib 0x33506e8a std::terminate() + 10
7 libstdc++.6.dylib 0x33506efe __cxa_rethrow + 62
8 libobjc.A.dylib 0x33f10fd8 objc_exception_rethrow + 4
9 CoreData 0x35624f66 _PFFaultHandlerLookupRow + 1450
10 CoreData 0x356799ba -[NSFaultHandler fulfillFault:withContext:] + 14
11 CoreData 0x35678782 _PF_FulfillDeferredFault + 354
12 CoreData 0x35623f18 _sharedIMPL_pvfk_core + 52
13 CoreData 0x35626b68 _pvfk_5 + 4
14 eLogger 0x0000e346 -[VicLogVC viewWillAppear:] (VicLogVC.m:207)
15 UIKit 0x3636bf14 -[UINavigationController _startTransition:fromViewController:toViewController:] + 604
16 UIKit 0x3636bc3c -[UINavigationController _startDeferredTransitionIfNeeded] + 176
17 UIKit 0x3635dd56 -[UINavigationController pushViewController:transition:forceImmediate:] + 634
18 UIKit 0x3635dacc -[UINavigationController pushViewController:animated:] + 28
19 eLogger 0x00025332 -[TripScreenVC _populateAndDisplayVicLog] (TripScreenVC.m:221)
20 eLogger 0x00025492 -[TripScreenVC _determineLogScreen] (TripScreenVC.m:258)
21 eLogger 0x000255d4 -[TripScreenVC buttonPressed:] (TripScreenVC.m:307)
22 CoreFoundation 0x30d4356a -[NSObject(NSObject) performSelector:withObject:withObject:] + 18
23 UIKit 0x36343ec2 -[UIApplication sendAction:to:from:forEvent:] + 78
24 UIKit 0x36343e62 -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 26
25 UIKit 0x36343e34 -[UIControl sendAction:to:forEvent:] + 32
26 UIKit 0x36343b86 -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 350
27 UIKit 0x3634441c -[UIControl touchesEnded:withEvent:] + 336
28 UIKit 0x36342bee -[UIWindow _sendTouchesForEvent:] + 362
29 UIKit 0x36342568 -[UIWindow sendEvent:] + 256
30 UIKit 0x3632b30c -[UIApplication sendEvent:] + 292
31 UIKit 0x3632ac4c _UIApplicationHandleEvent + 5084
32 GraphicsServices 0x34e2be70 PurpleEventCallback + 660
33 CoreFoundation 0x30daaa90 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION + 20
34 CoreFoundation 0x30dac838 __CFRunLoopDoSource1 + 160
35 CoreFoundation 0x30dad606 __CFRunLoopRun + 514
36 CoreFoundation 0x30d3debc CFRunLoopRunSpecific + 224
37 CoreFoundation 0x30d3ddc4 CFRunLoopRunInMode + 52
38 GraphicsServices 0x34e2b418 GSEventRunModal + 108
39 GraphicsServices 0x34e2b4c4 GSEventRun + 56
40 UIKit 0x36355d62 -[UIApplication _run] + 398
41 UIKit 0x36353800 UIApplicationMain + 664
42 eLogger 0x00002ff8 main (main.m:14)
43 eLogger 0x00002fa0 start + 32
【问题讨论】：
-
您是否已经尝试清理构建和所有目标？
-
是的，已经完成了，但是为什么会影响它呢？谢谢你的建议。
-
我认为如果您对核心数据进行了更改，那么您必须重置模拟器或从模拟器/设备中删除应用程序，以便它可以处理新的更改。