我又一次碰壁了。我可以可靠地产生您在下面看到的崩溃，但不知道如何解释结果。似乎问题发生在
Missing proxy for identifier UpstreamPlaceholder-sNv-dx-F0w
根据我所阅读的内容，这可能与
配置错误的故事板有关。但是，我不知道如何找到
UpstreamPlaceholder-sNv-dx-F0w
对此有什么想法吗？这确实是违规项目吗？
PS。这是我产生崩溃的方式：从主视图（诗歌）转到作者视图。搜索作者。删除一个。取消搜索。转到主（诗歌）视图。然后切换到类别视图。碰撞！诗歌、作者、类别是由 Core Data 支持的模型。每个都有它的视图控制器。
2013-11-08 08:19:39.137 Verz[82005:70b] HERE IS OCCoreDataVC, viewdidLoad
2013-11-08 08:19:39.172 Verz[82005:70b] OCCDTVC, setupTableView
2013-11-08 08:19:39.174 Verz[82005:70b] Current date/time: 2013-11-08 13:19:39 +0000
2013-11-08 08:19:39.175 Verz[82005:70b] Housekeeping, last time was 2013-11-08 13:06:59 +0000
2013-11-08 08:19:39.175 Verz[82005:70b] *** Here is MainVC (viewDidLoad
2013-11-08 08:19:39.176 Verz[82005:70b] *** MVC, self.editing = 0
2013-11-08 08:19:39.177 Verz[82005:70b] *** In OCCoreDataTVC, self.numberInSelection = 9
2013-11-08 08:19:39.178 Verz[82005:70b] *** Here is configurePredicate in MainC
2013-11-08 08:19:47.171 Verz[82005:70b] HERE IS OCCoreDataVC, viewdidLoad
2013-11-08 08:19:47.184 Verz[82005:70b] OCCDTVC, setupTableView
2013-11-08 08:19:47.184 Verz[82005:70b] *** In OCCoreDataTVC, self.numberInSelection = 6
2013-11-08 08:19:47.185 Verz[82005:70b] *** Here is configurePredicate in AuthorVC
2013-11-08 08:19:50.339 Verz[82005:70b] OCCDTVC, searchDisplayControllerDidBeginSearch
2013-11-08 08:19:51.624 Verz[82005:70b] *** Here is configurePredicate in AuthorVC
2013-11-08 08:19:51.998 Verz[82005:70b] *** Here is configurePredicate in AuthorVC
2013-11-08 08:19:58.410 Verz[82005:70b] AVC -- I will delete the author Samuel Taylor Coleridge
2013-11-08 08:20:11.389 Verz[82005:70b] *** Here is configurePredicate in AuthorVC
2013-11-08 08:20:11.651 Verz[82005:70b] *** End search, now self.editing set to 0 -- but maybe this obscures a bug
2013-11-08 08:20:15.793 Verz[82005:70b] *** In OCCoreDataTVC, self.numberInSelection = 8
2013-11-08 08:20:15.794 Verz[82005:70b] *** Here is configurePredicate in MainC
2013-11-08 08:20:23.194 Verz[82005:70b] HERE IS OCCoreDataVC, viewdidLoad
2013-11-08 08:20:23.194 Verz[82005:70b] *** I am about to crash!
2013-11-08 08:20:23.197 Verz[82005:70b] Missing proxy for identifier UpstreamPlaceholder-sNv-dx-F0w
2013-11-08 08:20:23.197 Verz[82005:70b] Missing proxy for identifier UpstreamPlaceholder-yQQ-L6-p1p
2013-11-08 08:20:23.209 Verz[82005:70b] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<UIProxyObject 0xb473060> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key searchBar.'
*** First throw call stack:
(
0 CoreFoundation 0x01ff75e4 __exceptionPreprocess + 180
1 libobjc.A.dylib 0x01be68b6 objc_exception_throw + 44
2 CoreFoundation 0x020876a1 -[NSException raise] + 17
3 Foundation 0x013389ee -[NSObject(NSKeyValueCoding) setValue:forUndefinedKey:] + 282
4 Foundation 0x012a4cfb _NSSetUsingKeyValueSetter + 88
5 Foundation 0x012a4253 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 267
6 Foundation 0x0130670a -[NSObject(NSKeyValueCoding) setValue:forKeyPath:] + 412
7 UIKit 0x00687a15 -[UIRuntimeOutletConnection connect] + 106
8 libobjc.A.dylib 0x01bf87d2 -[NSObject performSelector:] + 62
9 CoreFoundation 0x01ff2b6a -[NSArray makeObjectsPerformSelector:] + 314
10 UIKit 0x0068656e -[UINib instantiateWithOwner:options:] + 1417
11 UIKit 0x004f8605 -[UIViewController _loadViewFromNibNamed:bundle:] + 280
12 UIKit 0x004f8dad -[UIViewController loadView] + 302
13 UIKit 0x006a111e -[UITableViewController loadView] + 80
14 UIKit 0x004f90ae -[UIViewController loadViewIfRequired] + 78
15 UIKit 0x004f95b4 -[UIViewController view] + 35
16 UIKit 0x006a0ea8 -[UITableViewController tableView] + 36
17 UIKit 0x006a196b -[UITableViewController setEditing:animated:] + 91
18 UIKit 0x006a1f1b -[UITableViewController tableView:didEndEditingRowAtIndexPath:] + 49
19 UIKit 0x004becbb -[UITableView _sendDidEndEditingForIndexPath:] + 69
20 UIKit 0x004d5a1f -[UITableView _endSwipeToDeleteRowDidDelete:] + 316
21 UIKit 0x004cc8bb -[UITableView willMoveToSuperview:] + 83
22 UIKit 0x004403cf __UIViewWillBeRemovedFromSuperview + 176
23 UIKit 0x00440238 -[UIView(Hierarchy) removeFromSuperview] + 70
24 UIKit 0x0045c6bf -[UIScrollView removeFromSuperview] + 84
25 UIKit 0x0077c1e9 -[UISearchDisplayController _destroyManagedTableView] + 143
26 UIKit 0x0077af88 -[UISearchDisplayController dealloc] + 130
27 libobjc.A.dylib 0x01bf7692 _ZN11objc_object17sidetable_releaseEb + 268
28 libobjc.A.dylib 0x01bf8adf -[NSObject release] + 25
29 CoreFoundation 0x01f78cb0 CFRelease + 272
30 CoreFoundation 0x01fabc92 -[__NSArrayI dealloc] + 82
31 libobjc.A.dylib 0x01bf7692 _ZN11objc_object17sidetable_releaseEb + 268
32 libobjc.A.dylib 0x01bf8adf -[NSObject release] + 25
33 UIKit 0x004f7b65 -[UIViewController dealloc] + 1577
34 UIKit 0x006a0e1a -[UITableViewController dealloc] + 276
35 Verz 0x0000f7d1 -[RHCoreDataTableViewController dealloc] + 161
36 UIKit 0x004f4975 -[UIViewController release] + 89
37 libobjc.A.dylib 0x01bf6e97 objc_release + 71
38 libobjc.A.dylib 0x01bf6e3e objc_storeStrong + 39
39 Verz 0x000072d9 -[ModelController setTvc:] + 57
40 Verz 0x00022a9b -[OCCoreDataTableViewController viewDidLoad] + 235
41 UIKit 0x004f9318 -[UIViewController loadViewIfRequired] + 696
42 UIKit 0x004f95b4 -[UIViewController view] + 35
43 UIKit 0x005133e2 -[UINavigationController _startCustomTransition:] + 778
44 UIKit 0x005200c7 -[UINavigationController _startDeferredTransitionIfNeeded:] + 688
45 UIKit 0x00520cb9 -[UINavigationController __viewWillLayoutSubviews] + 57
46 UIKit 0x0065a181 -[UILayoutContainerView layoutSubviews] + 213
47 UIKit 0x00450267 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 355
48 libobjc.A.dylib 0x01bf881f -[NSObject performSelector:withObject:] + 70
49 QuartzCore 0x001792ea -[CALayer layoutSublayers] + 148
50 QuartzCore 0x0016d0d4 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 380
51 QuartzCore 0x0016cf40 _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 26
52 QuartzCore 0x000d4ae6 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 294
53 QuartzCore 0x000d5e71 _ZN2CA11Transaction6commitEv + 393
54 QuartzCore 0x000d6544 _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv + 92
55 CoreFoundation 0x01fbf4ce __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 30
56 CoreFoundation 0x01fbf41f __CFRunLoopDoObservers + 399
57 CoreFoundation 0x01f9d344 __CFRunLoopRun + 1076
58 CoreFoundation 0x01f9cac3 CFRunLoopRunSpecific + 467
59 CoreFoundation 0x01f9c8db CFRunLoopRunInMode + 123
60 GraphicsServices 0x036469e2 GSEventRunModal + 192
61 GraphicsServices 0x03646809 GSEventRun + 104
62 UIKit 0x003e5d3b UIApplicationMain + 1225
63 Verz 0x000026bd main + 141
64 libdyld.dylib 0x032e870d start + 1
65 ??? 0x00000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException