首先，我用 3 个不同的 UIView 来替换 iPad Storyboard 上 Split View Controller 中的详细视图
它在 iOS 8 iPad 上运行良好。但是，当我加载详细视图之一时，应用程序在 iOS 7 和 iOS 6 模拟器中运行时崩溃。
我只是假设这是因为我的情节提要上的自动布局。
有谁知道如何修理它？
2014-09-25 04:15:19.705 PSTappsperance[48327:60b] Pad AppDelegate ########
2014-09-25 04:15:27.869 PSTappsperance[48327:60b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Unable to create description in descriptionForLayoutAttribute_layoutItem_coefficient. Something is nil'
*** First throw call stack:
(
0 CoreFoundation 0x0000000110a5c495 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x00000001107af99e objc_exception_throw + 43
2 CoreFoundation 0x0000000110a5c2ad +[NSException raise:format:] + 205
3 Foundation 0x00000001104ec548 descriptionForLayoutAttribute_layoutItem_coefficient + 145
4 Foundation 0x00000001104ec3bc -[NSLayoutConstraint equationDescription] + 216
5 Foundation 0x00000001104ec831 -[NSLayoutConstraint description] + 297
6 CoreFoundation 0x0000000110a1d1b9 -[NSArray descriptionWithLocale:indent:] + 345
7 Foundation 0x000000011037e14e _NSDescriptionWithLocaleFunc + 64
8 CoreFoundation 0x00000001109e1244 __CFStringAppendFormatCore + 7252
9 CoreFoundation 0x0000000110a1f913 _CFStringCreateWithFormatAndArgumentsAux + 115
10 CoreFoundation 0x0000000110a7fa5b _CFLogvEx + 123
11 Foundation 0x00000001103ae276 NSLogv + 79
12 Foundation 0x00000001103ae20a NSLog + 148
13 UIKit 0x000000010f927097 -[UIView(UIConstraintBasedLayout_EngineDelegate) engine:willBreakConstraint:dueToMutuallyExclusiveConstraints:] + 62
14 Foundation 0x00000001104e32ac -[NSISEngine handleUnsatisfiableRowWithHead:body:usingInfeasibilityHandlingBehavior:mutuallyExclusiveConstraints:] + 521
15 Foundation 0x00000001104e49b1 -[NSISEngine tryUsingArtificialVariableToAddConstraintWithMarker:rowBody:usingInfeasibilityHandlingBehavior:mutuallyExclusiveConstraints:] + 353
16 Foundation 0x000000011039c26b -[NSISEngine tryToAddConstraintWithMarker:expression:integralizationAdjustment:mutuallyExclusiveConstraints:] + 663
17 Foundation 0x00000001104ed180 -[NSLayoutConstraint _addLoweredExpression:toEngine:integralizationAdjustment:lastLoweredConstantWasRounded:mutuallyExclusiveConstraints:] + 275
18 Foundation 0x00000001103981b0 -[NSLayoutConstraint _addToEngine:integralizationAdjustment:mutuallyExclusiveConstraints:] + 204
19 UIKit 0x000000010f923f41 __57-[UIView(AdditionalLayoutSupport) _switchToLayoutEngine:]_block_invoke_2 + 413
20 Foundation 0x00000001104e529a -[NSISEngine withBehaviors:performModifications:] + 119
21 UIKit 0x000000010f923d7d __57-[UIView(AdditionalLayoutSupport) _switchToLayoutEngine:]_block_invoke + 401
22 UIKit 0x000000010f923bc3 -[UIView(AdditionalLayoutSupport) _switchToLayoutEngine:] + 197
23 UIKit 0x000000010f923e57 __57-[UIView(AdditionalLayoutSupport) _switchToLayoutEngine:]_block_invoke_2 + 179
24 Foundation 0x00000001104e529a -[NSISEngine withBehaviors:performModifications:] + 119
25 UIKit 0x000000010f923d7d __57-[UIView(AdditionalLayoutSupport) _switchToLayoutEngine:]_block_invoke + 401
26 UIKit 0x000000010f923bc3 -[UIView(AdditionalLayoutSupport) _switchToLayoutEngine:] + 197
27 UIKit 0x000000010f3ab975 __45-[UIView(Hierarchy) _postMovedFromSuperview:]_block_invoke + 95
28 Foundation 0x00000001104e529a -[NSISEngine withBehaviors:performModifications:] + 119
29 UIKit 0x000000010f3ab889 -[UIView(Hierarchy) _postMovedFromSuperview:] + 321
30 UIKit 0x000000010f3b52ac -[UIView(Internal) _addSubview:positioned:relativeTo:] + 1508
31 UIKit 0x000000010f632778 -[UINavigationTransitionView transition:fromView:toView:] + 454
32 UIKit 0x000000010f6325b0 -[UINavigationTransitionView transition:toView:] + 25
33 UIKit 0x000000010f46f4d7 -[UINavigationController _startTransition:fromViewController:toViewController:] + 2893
34 UIKit 0x000000010f46f787 -[UINavigationController _startDeferredTransitionIfNeeded:] + 547
35 UIKit 0x000000010f470238 -[UINavigationController __viewWillLayoutSubviews] + 43
36 UIKit 0x000000010f58a895 -[UILayoutContainerView layoutSubviews] + 202
37 UIKit 0x000000010f3b7993 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 354
38 QuartzCore 0x000000011427c802 -[CALayer layoutSublayers] + 151
39 QuartzCore 0x0000000114271369 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 363
40 QuartzCore 0x00000001142711ea _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 24
41 QuartzCore 0x00000001141e4fb8 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 252
42 QuartzCore 0x00000001141e6030 _ZN2CA11Transaction6commitEv + 394
43 QuartzCore 0x00000001141e669d _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv + 89
44 CoreFoundation 0x0000000110a27dc7 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
45 CoreFoundation 0x0000000110a27d37 __CFRunLoopDoObservers + 391
46 CoreFoundation 0x0000000110a07522 __CFRunLoopRun + 946
47 CoreFoundation 0x0000000110a06d83 CFRunLoopRunSpecific + 467
48 GraphicsServices 0x0000000112dbdf04 GSEventRunModal + 161
49 UIKit 0x000000010f357e33 UIApplicationMain + 1010
50 PSTappsperance 0x000000010f092653 main + 115
51 libdyld.dylib 0x00000001114b05fd start + 1
52 ??? 0x0000000000000001 0x0 + 1
)libc++abi.dylib: terminating with uncaught exception of type NSException
当您运行应用程序时会出现此崩溃Margins and 基线在约束条件下iOS 7.
要查找并删除所有虚拟约束字符串，您可以执行以下操作：
Xcode没有正确突出显示所有这些约束Interface Builder，所以你可以使用这个解决方案：
- Close
Xcode
- 在您最喜欢的文本编辑器中打开故事板文件
- 使用正则表达式查找所有出现的情况：
(\w)Margin"并将它们全部替换为以下模式：\1" （正则表达式版本是Sublime 2中使用的版本）
- 使用以下模式查找并从故事板文件中删除所有字符串：
.*"baseline".*\n
- 现在保存文件并在以下位置打开它
Xcode
- 修复所有出现的未对齐：找到所有警告并按_“更新所有视图的约束”以保存所有视图的原始位置。
- Profit!
Update:我发现“基线”约束也会导致崩溃，但 Xcode 不会显示有关这些约束的任何警告！
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