我又一次撞墙了。我可以可靠地产生崩溃 您在下面看到，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
根据我所读到的，这可能与左派有关 错误配置的故事板。但是，我不知道如何找到
UpstreamPlaceholder-sNv-dx-F0w
有关于此的任何想法吗？这确实是违规的项目吗？
PS。以下是我如何制作崩溃：从主视图（诗歌）到作者视图。搜索作者。删除一个。取消搜索。转到主（诗）视图。然后切换到类别视图。崩溃！诗歌，作者，类别是Core Data支持的模型。每个人都有 在视图控制器上。
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
答案 0 :(得分：0)
我的应用程序出现了类似的问题，如果我在tableview上搜索，删除其中一个项目，取消搜索模式，然后单击后退按钮，我会看到上面提到的相同错误。删除项目并单击后退而不执行搜索步骤将导致一切正常工作且不会发生崩溃。经过大量的试验和错误，我可以通过在单击取消搜索按钮时将搜索栏文本设置为空来解决此问题。点击取消搜索按钮会触发searchDisplayControllerDidEndSearch，所以我添加了self.searchDisplayController.searchBar.Text = @“”;到那种阻止错误发生的方法。