我在崩溃日志中获得了下一行： [NSConcreteMapTable assign：key：value：isNew：] 此崩溃发生在iOS 7上，但不发生在iOS 8上。
在此行之前的某个地方有对NSLayoutConstraint的调用：
- [NSLayoutConstraint _addLoweredExpression：toEngine：integralizationAdjustment：lastLoweredConstantWasRounded：mutualExclusiveConstraints：]
- [NSLayoutConstraint _addToEngine：integralizationAdjustment：mutualExclusiveConstraints：]
- [NSLayoutConstraint _addToEngine：]
你们认为这次崩溃与我设置的Storyboard布局约束有关吗？
Thread : Crashed: com.apple.main-thread
0 libobjc.A.dylib 0x3b46d626 objc_msgSend + 5
1 Foundation 0x315da681 -[NSConcreteMapTable assign:key:value:isNew:] + 68
2 Foundation 0x315da5fb -[NSConcreteMapTable setObject:forKey:] + 82
3 Foundation 0x3161daf7 -[NSISEngine setRowWithHead:body:] + 30
4 Foundation 0x316205d1 -[NSISEngine pivotToMakeBodyVar:newHeadOfRowWithHead:andDropRow:] + 388
5 Foundation 0x3161e325 -[NSISEngine minimizeConstantInObjectiveRowWithHead:] + 236
6 Foundation 0x31620d9f -[NSISEngine tryUsingArtificialVariableToAddConstraintWithMarker:rowBody:usingInfeasibilityHandlingBehavior:mutuallyExclusiveConstraints:] + 226
7 Foundation 0x3161c5fd -[NSISEngine tryToAddConstraintWithMarker:expression:integralizationAdjustment:mutuallyExclusiveConstraints:] + 692
8 Foundation 0x3161c23b -[NSLayoutConstraint _addLoweredExpression:toEngine:integralizationAdjustment:lastLoweredConstantWasRounded:mutuallyExclusiveConstraints:] + 286
9 Foundation 0x31619f6d -[NSLayoutConstraint _addToEngine:integralizationAdjustment:mutuallyExclusiveConstraints:] + 232
10 Foundation 0x316257ed -[NSLayoutConstraint _addToEngine:] + 28
11 UIKit 0x335c2c55 __57-[UIView(AdditionalLayoutSupport) _switchToLayoutEngine:]_block_invoke_2 + 332
12 Foundation 0x31619b2b -[NSISEngine withBehaviors:performModifications:] + 210
13 UIKit 0x335c2ad9 __57-[UIView(AdditionalLayoutSupport) _switchToLayoutEngine:]_block_invoke + 336
14 UIKit 0x334cf20d -[UIView(AdditionalLayoutSupport) _switchToLayoutEngine:] + 200
15 UIKit 0x335c2bbb __57-[UIView(AdditionalLayoutSupport) _switchToLayoutEngine:]_block_invoke_2 + 178
16 Foundation 0x31619b2b -[NSISEngine withBehaviors:performModifications:] + 210
17 UIKit 0x335c2ad9 __57-[UIView(AdditionalLayoutSupport) _switchToLayoutEngine:]_block_invoke + 336
18 UIKit 0x334cf20d -[UIView(AdditionalLayoutSupport) _switchToLayoutEngine:] + 200
19 UIKit 0x335c2bbb __57-[UIView(AdditionalLayoutSupport) _switchToLayoutEngine:]_block_invoke_2 + 178
20 Foundation 0x31619b2b -[NSISEngine withBehaviors:performModifications:] + 210
21 UIKit 0x335c2ad9 __57-[UIView(AdditionalLayoutSupport) _switchToLayoutEngine:]_block_invoke + 336
22 UIKit 0x334cf20d -[UIView(AdditionalLayoutSupport) _switchToLayoutEngine:] + 200
23 UIKit 0x335c2bbb __57-[UIView(AdditionalLayoutSupport) _switchToLayoutEngine:]_block_invoke_2 + 178
24 Foundation 0x31619b2b -[NSISEngine withBehaviors:performModifications:] + 210
25 UIKit 0x335c2ad9 __57-[UIView(AdditionalLayoutSupport) _switchToLayoutEngine:]_block_invoke + 336
26 UIKit 0x334cf20d -[UIView(AdditionalLayoutSupport) _switchToLayoutEngine:] + 200
27 UIKit 0x334cee33 __45-[UIView(Hierarchy) _postMovedFromSuperview:]_block_invoke + 82
28 Foundation 0x31619b2b -[NSISEngine withBehaviors:performModifications:] + 210
29 UIKit 0x334cecd3 -[UIView(Hierarchy) _postMovedFromSuperview:] + 298
30 UIKit 0x334dba4f -[UIView(Internal) _addSubview:positioned:relativeTo:] + 1414
31 UIKit 0x334db4bf -[UIView(Hierarchy) addSubview:] + 30
32 UIKit 0x335bcdb7 -[UITransitionView transition:fromView:toView:removeFromView:] + 978
33 UIKit 0x335fcf3f -[UITransitionView transition:fromView:toView:] + 30
34 UIKit 0x335fcf15 -[UITransitionView transition:toView:] + 104
35 UIKit 0x335fc03b -[UITabBarController transitionFromViewController:toViewController:transition:shouldSetSelected:] + 1106
36 UIKit 0x335fbbdf -[UITabBarController transitionFromViewController:toViewController:] + 38
37 UIKit 0x335fbab7 -[UITabBarController _setSelectedViewController:] + 258
38 UIKit 0x336c5dd5 -[UITabBarController _tabBarItemClicked:] + 272
39 UIKit 0x33505037 -[UIApplication sendAction:to:from:forEvent:] + 90
40 UIKit 0x33504fd7 -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 30
41 UIKit 0x336c5c8b -[UITabBar _sendAction:withEvent:] + 370
42 UIKit 0x33505037 -[UIApplication sendAction:to:from:forEvent:] + 90
43 UIKit 0x33504fd7 -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 30
44 UIKit 0x33504fb1 -[UIControl sendAction:to:forEvent:] + 44
45 UIKit 0x334f0717 -[UIControl _sendActionsForEvents:withEvent:] + 374
46 Foundation 0x31693163 __NSFireDelayedPerform + 414
47 CoreFoundation 0x30c7e167 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 14
48 CoreFoundation 0x30c7dd7f __CFRunLoopDoTimer + 782
49 CoreFoundation 0x30c7c11b __CFRunLoopRun + 1210
50 CoreFoundation 0x30be6ebf CFRunLoopRunSpecific + 522
51 CoreFoundation 0x30be6ca3 CFRunLoopRunInMode + 106
52 GraphicsServices 0x35aec663 GSEventRunModal + 138
53 UIKit 0x3353314d UIApplicationMain + 1136
答案 0 :(得分：2)
好像你只使用iOS 8限制去故事板打开它在左上角你会看到一个带有阅读标记的小黄色图标按下它并搜索iOS8仅警告，如果你发现任何删除那些约束并重建您的应用程序。