Question

发生以下崩溃。 Xcode没有（严肃地）报告任何遗漏的约束，并且每次都不会发生崩溃。很明显我在某个地方有一个错误 - 但我在哪里开始调查？

修改：

因此，在创建异常断点之后 - 我发现崩溃的线程是自动布局代码。不同的线程具有以下内容 enter image description here

这并不令人震惊，这是对UILabel的重新调整 - 现在是什么？

崩溃转储：

RemoveVariableFromSortedPriorityVectorList(NSISObjectiveLinearExpression *, NSISVariable *)(), /SourceCache/Foundation_Sim/Foundation-1047.25/Layout.subproj/IncrementalSimplex/NSISObjectiveLinearExpression.m:136
2014-11-03 00:28:14.899 Cookila copy[3470:60b] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Missing variable UILabel:0x78885670.Width{id: 5777} in variablesSortedByPriorityVectors'
*** First throw call stack:
(
    0   CoreFoundation                      0x03ba91e4 __exceptionPreprocess + 180
    1   libobjc.A.dylib                     0x0386a8e5 objc_exception_throw + 44
    2   CoreFoundation                      0x03ba9048 +[NSException raise:format:arguments:] + 136
    3   Foundation                          0x03307b20 -[NSAssertionHandler handleFailureInFunction:file:lineNumber:description:] + 101
    4   Foundation                          0x03414df4 RemoveVariableFromSortedPriorityVectorList + 386
    5   Foundation                          0x0329af95 -[NSISObjectiveLinearExpression removeVariable:] + 30
    6   Foundation                          0x034152b9 -[NSISObjectiveLinearExpression replaceVariable:withExpression:processVariableNewToReceiver:processVariableDroppedFromReceiver:] + 76
    7   Foundation                          0x0329b3f7 -[NSISEngine substituteOutAllOccurencesOfBodyVar:withExpression:] + 897
    8   Foundation                          0x0340b5cf -[NSISEngine pivotToMakeBodyVar:newHeadOfRowWithHead:andDropRow:] + 421
    9   Foundation                          0x0329a098 -[NSISEngine minimizeConstantInObjectiveRowWithHead:] + 287
    10  Foundation                          0x0340db9d -[NSISEngine tryUsingArtificialVariableToAddConstraintWithMarker:rowBody:usingInfeasibilityHandlingBehavior:mutuallyExclusiveConstraints:] + 300
    11  Foundation                          0x03298fc3 -[NSISEngine tryToAddConstraintWithMarker:expression:integralizationAdjustment:mutuallyExclusiveConstraints:] + 780
    12  Foundation                          0x03417a77 -[NSLayoutConstraint _addLoweredExpression:toEngine:integralizationAdjustment:lastLoweredConstantWasRounded:mutuallyExclusiveConstraints:] + 283
    13  Foundation                          0x03294596 -[NSLayoutConstraint _addToEngine:integralizationAdjustment:mutuallyExclusiveConstraints:] + 252
    14  UIKit                               0x029ac30d -[UIView(UIConstraintBasedLayout) _layoutEngine_didAddLayoutConstraint:roundingAdjustment:mutuallyExclusiveConstraints:] + 451
    15  UIKit                               0x029ada4b -[UIView(UIConstraintBasedLayout) _constraints_didChangeAutoresizingConstraintsArrayForContainedView:] + 233
    16  UIKit                               0x029ad60e -[UIView(UIConstraintBasedLayout) _setAutoresizingConstraints:] + 240
    17  UIKit                               0x029adea0 -[UIView(UIConstraintBasedLayout) _updateAutoresizingConstraints] + 117
    18  UIKit                               0x029b77bf -[UIView(AdditionalLayoutSupport) updateConstraints] + 110
    19  UIKit                               0x029b7058 -[UIView(AdditionalLayoutSupport) _internalUpdateConstraintsIfNeededAccumulatingViewsNeedingSecondPass:] + 239
    20  UIKit                               0x029b71d6 -[UIView(AdditionalLayoutSupport) _updateConstraintsIfNeededAccumulatingViewsNeedingSecondPass:] + 122
    21  UIKit                               0x029b7157 __UIViewRecursionHelper + 40
    22  CoreFoundation                      0x03b4ac69 CFArrayApplyFunction + 57
    23  UIKit                               0x029b6ffc -[UIView(AdditionalLayoutSupport) _internalUpdateConstraintsIfNeededAccumulatingViewsNeedingSecondPass:] + 147
    24  UIKit                               0x029b71d6 -[UIView(AdditionalLayoutSupport) _updateConstraintsIfNeededAccumulatingViewsNeedingSecondPass:] + 122
    25  UIKit                               0x029b7157 __UIViewRecursionHelper + 40
    26  CoreFoundation                      0x03b4ac69 CFArrayApplyFunction + 57
    27  UIKit                               0x029b6ffc -[UIView(AdditionalLayoutSupport) _internalUpdateConstraintsIfNeededAccumulatingViewsNeedingSecondPass:] + 147
    28  UIKit                               0x029b71d6 -[UIView(AdditionalLayoutSupport) _updateConstraintsIfNeededAccumulatingViewsNeedingSecondPass:] + 122
    29  UIKit                               0x029b7157 __UIViewRecursionHelper + 40
    30  CoreFoundation                      0x03b4ac69 CFArrayApplyFunction + 57
    31  UIKit                               0x029b6ffc -[UIView(AdditionalLayoutSupport) _internalUpdateConstraintsIfNeededAccumulatingViewsNeedingSecondPass:] + 147
    32  UIKit                               0x029b71d6 -[UIView(AdditionalLayoutSupport) _updateConstraintsIfNeededAccumulatingViewsNeedingSecondPass:] + 122
    33  UIKit                               0x029b7157 __UIViewRecursionHelper + 40
    34  CoreFoundation                      0x03b4ac69 CFArrayApplyFunction + 57
    35  UIKit                               0x029b6ffc -[UIView(AdditionalLayoutSupport) _internalUpdateConstraintsIfNeededAccumulatingViewsNeedingSecondPass:] + 147
    36  UIKit                               0x029b71d6 -[UIView(AdditionalLayoutSupport) _updateConstraintsIfNeededAccumulatingViewsNeedingSecondPass:] + 122
    37  UIKit                               0x029b7157 __UIViewRecursionHelper + 40
    38  CoreFoundation                      0x03b4ac69 CFArrayApplyFunction + 57
    39  UIKit                               0x029b6ffc -[UIView(AdditionalLayoutSupport) _internalUpdateConstraintsIfNeededAccumulatingViewsNeedingSecondPass:] + 147
    40  UIKit                               0x029b71d6 -[UIView(AdditionalLayoutSupport) _updateConstraintsIfNeededAccumulatingViewsNeedingSecondPass:] + 122
    41  UIKit                               0x029b7157 __UIViewRecursionHelper + 40
    42  CoreFoundation                      0x03b4ac69 CFArrayApplyFunction + 57
    43  UIKit                               0x029b6ffc -[UIView(AdditionalLayoutSupport) _internalUpdateConstraintsIfNeededAccumulatingViewsNeedingSecondPass:] + 147
    44  UIKit                               0x029b71d6 -[UIView(AdditionalLayoutSupport) _updateConstraintsIfNeededAccumulatingViewsNeedingSecondPass:] + 122
    45  UIKit                               0x029b7157 __UIViewRecursionHelper + 40
    46  CoreFoundation                      0x03b4ac69 CFArrayApplyFunction + 57
    47  UIKit                               0x029b6ffc -[UIView(AdditionalLayoutSupport) _internalUpdateConstraintsIfNeededAccumulatingViewsNeedingSecondPass:] + 147
    48  UIKit                               0x029b71d6 -[UIView(AdditionalLayoutSupport) _updateConstraintsIfNeededAccumulatingViewsNeedingSecondPass:] + 122
    49  UIKit                               0x029b7157 __UIViewRecursionHelper + 40
    50  CoreFoundation                      0x03b4ac69 CFArrayApplyFunction + 57
    51  UIKit                               0x029b6ffc -[UIView(AdditionalLayoutSupport) _internalUpdateConstraintsIfNeededAccumulatingViewsNeedingSecondPass:] + 147
    52  UIKit                               0x029b71d6 -[UIView(AdditionalLayoutSupport) _updateConstraintsIfNeededAccumulatingViewsNeedingSecondPass:] + 122
    53  UIKit                               0x029b7157 __UIViewRecursionHelper + 40
    54  CoreFoundation                      0x03b4ac69 CFArrayApplyFunction + 57
    55  UIKit                               0x029b6ffc -[UIView(AdditionalLayoutSupport) _internalUpdateConstraintsIfNeededAccumulatingViewsNeedingSecondPass:] + 147
    56  UIKit                               0x029b71d6 -[UIView(AdditionalLayoutSupport) _updateConstraintsIfNeededAccumulatingViewsNeedingSecondPass:] + 122
    57  UIKit                               0x029ab878 __62-[UIWindow(UIConstraintBasedLayout) updateConstraintsIfNeeded]_block_invoke + 43
    58  Foundation                          0x0340e68c -[NSISEngine withBehaviors:performModifications:] + 107
    59  Foundation                          0x0329e3c5 -[NSISEngine withAutomaticOptimizationDisabled:] + 48
    60  UIKit                               0x029ab590 -[UIWindow(UIConstraintBasedLayout) updateConstraintsIfNeeded] + 225
    61  UIKit                               0x029b7836 -[UIView(AdditionalLayoutSupport) _updateConstraintsAtWindowLevelIfNeeded] + 85
    62  UIKit                               0x0237b324 -[UIView(Hierarchy) layoutSubviews] + 62
    63  UIKit                               0x02388964 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 355
    64  libobjc.A.dylib                     0x0387c82b -[NSObject performSelector:withObject:] + 70
    65  QuartzCore                          0x021f045a -[CALayer layoutSublayers] + 148
    66  QuartzCore                          0x021e4244 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 380
    67  QuartzCore                          0x021e40b0 _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 26
    68  QuartzCore                          0x0214a7fa _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 294
    69  QuartzCore                          0x0214bb85 _ZN2CA11Transaction6commitEv + 393
    70  QuartzCore                          0x0214c258 _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv + 92
    71  CoreFoundation                      0x03b7136e __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 30
    72  CoreFoundation                      0x03b712bf __CFRunLoopDoObservers + 399
    73  CoreFoundation                      0x03b4f254 __CFRunLoopRun + 1076
    74  CoreFoundation                      0x03b4e9d3 CFRunLoopRunSpecific + 467
    75  CoreFoundation                      0x03b4e7eb CFRunLoopRunInMode + 123
    76  GraphicsServices                    0x045815ee GSEventRunModal + 192
    77  GraphicsServices                    0x0458142b GSEventRun + 104
    78  UIKit                               0x02319f9b UIApplicationMain + 1225
    79  Cookila copy                        0x000e594d main + 141
    80  libdyld.dylib                       0x0415b701 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException

Answer 1

如果它是UILabel的调整大小你有约束我会尝试删除它有的约束，调整它然后设置新的约束（即使它们与前面的约束相同）。您可以编辑/覆盖该方法以重新标记标签删除并重新添加约束。

代码：

[label autoRemoveConstraintsAffectingView];
//Resize
//Add constraints
[self.view needsUpdateConstraints];
[self.view layoutIfNeeded];

iOS自动布局崩溃 - 我从哪里开始？

1 个答案: