当具有动画YES的push viewcontroller时应用程序崩溃

Question

使用autolayout时遇到了一个奇怪的问题。在我的xib中，我添加了一些Aspect Ratio约束。当我使用动画YES推动视图控制器时，它会与＆＃34; NSInternalInconsistencyException＆＃34;崩溃。并且＆＃34;找不到传入头部UIView的传出行头：＆＃34;类似的东西。当动画设置为NO时，似乎没问题。这发生在较低的ios8中。

然后我在AutoLayout views make app crash on popViewController找到了一些东西。我按照 narsil 的回答，以某种方式修复它。但我无法弄清楚原因。似乎我必须在viewWillDisappear方法离开控制器时删除每个宽高比约束。

还有其他方法可以解决这个问题吗？

这是日志，我只是删掉了部分内容。

[4150:60b] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '<NSISEngine: 0x7f8749c3f650>{ Rows:
    0x7f8749c5f500.posErrorMarker{id: 259} == 135 + 1*0x7f8749f80610.marker{id: 80} + 3*0x7f8749f80f00.marker{id: 178} + 1*0x7f8749f80f50.marker{id: 179} + -1*0x7f8749f81310.marker{id: 198} + 1*0x7f8749f81360.marker{id: 199} + 2*0x7f8749f81400.marker{id: 203} + 1*0x7f8749f81770.marker{id: 221} + 1*0x7f8749f81810.marker{id: 224} + -1*0x7f8749f82b30.marker{id: 235} + -1*0x7f8749f82bd0.marker{id: 239} + 1*0x7f8749f82cc0.marker{id: 245} + 1*0x7f8749f82d10.marker{id: 247} + 1*0x7f8749c5f500.negError{id: 260} + 3*0x7f8749f6dc30.posErrorMarker{id: 343} + -3*0x7f8749f6dc30.negError{id: 344}
    0x7f8749c63650.negError{id: 288} == 0 + -1*0x7f8749f80f00.marker{id: 178} + -1*0x7f8749f81400.marker{id: 203} + 1*0x7f8749c63650.posErrorMarker{id: 287} + -1*0x7f8749f6dc30.posErrorMarker{id: 343} + 1*0x7f8749f6dc30.negError{id: 344}
    0x7f8749c63e50.posErrorMarker{id: 289} == 284 + -9.48148*0x7f8749f80570.marker{id: 79} + -0.333333*0x7f8749f80fa0.marker{id: 181} + -0.333333*0x7f8749f81090.marker{id: 186} + -0.666667*0x7f8749f810e0.marker{id: 188} + 0.333333*0x7f8749f81130.marker{id: 189} + -0.333333*0x7f8749f811d0.marker{id: 191} + -0.333333*0x7f8749f81220.marker{id: 194} + 1*0x7f8749f812c0.marker{id: 197} + 0.666667*0x7f8749f82c70.marker{id: 244} + 4.74074*0x7f8749c5f580.posErrorMarker{id: 261} + -4.74074*0x7f8749c5f580.negError{id: 262} + 1*0x7f8749c63e50.negError{id: 290}

Statistics:
    171 rows. Variable counts:
          1 ->  40
          2 ->  50
          3 ->   7
          4 ->  11
          5 ->   6
          6 ->   5
          7 ->   5
          8 ->   2
          9 ->   4
         10 ->   6
         11 ->   6
         12 ->   4
         13 ->   6
         14 ->   5
         15 ->   3
         16 ->   4
         17 ->   4
         19 ->   3
}: internal error.  Cannot find an outgoing row head for incoming head UILabel:0x7f874c05b950.Width{id: 5939}, which should never happen.'
*** First throw call stack:
(
    0   CoreFoundation                      0x0000000106cda495 __exceptionPreprocess + 165
    1   libobjc.A.dylib                     0x000000010674a99e objc_exception_throw + 43
    2   CoreFoundation                      0x0000000106cda2ad +[NSException raise:format:] + 205
    3   Foundation                          0x0000000106338054 -[NSISEngine minimizeConstantInObjectiveRowWithHead:] + 178
    4   Foundation                          0x0000000106337f22 -[NSISEngine optimize] + 147
    5   Foundation                          0x00000001064802e3 -[NSISEngine withBehaviors:performModifications:] + 192
    6   UIKit                               0x0000000107364889 -[UIView(Hierarchy) _postMovedFromSuperview:] + 321
    7   UIKit                               0x0000000107362f42 __UIViewWasRemovedFromSuperview + 206
    8   UIKit                               0x0000000107362b9e -[UIView(Hierarchy) removeFromSuperview] + 218
    9   UIKit                               0x0000000107425069 -[UINavigationController navigationTransitionView:didEndTransition:fromView:toView:] + 320
    10  UIKit                               0x000000010741dfdd __49-[UINavigationController _startCustomTransition:]_block_invoke + 138
    11  UIKit                               0x0000000107973c2a -[_UIViewControllerTransitionContext completeTransition:] + 78
    12  UIKit                               0x0000000107306da4 __53-[_UINavigationParallaxTransition animateTransition:]_block_invoke103 + 605
    13  UIKit                               0x00000001073696e8 -[UIViewAnimationBlockDelegate _didEndBlockAnimation:finished:context:] + 299
    14  UIKit                               0x000000010735568e -[UIViewAnimationState sendDelegateAnimationDidStop:finished:] + 235
    15  UIKit                               0x0000000107355941 -[UIViewAnimationState animationDidStop:finished:] + 78
    16  QuartzCore                          0x000000010a920134 _ZN2CA5Layer23run_animation_callbacksEPv + 310
    17  libdispatch.dylib                   0x000000010868172d _dispatch_client_callout + 8
    18  libdispatch.dylib                   0x00000001086713fc _dispatch_main_queue_callback_4CF + 354
    19  CoreFoundation                      0x0000000106d38289 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9
    20  CoreFoundation                      0x0000000106c85854 __CFRunLoopRun + 1764
    21  CoreFoundation                      0x0000000106c84d83 CFRunLoopRunSpecific + 467
    22  GraphicsServices                    0x000000010900df04 GSEventRunModal + 161
    23  UIKit                               0x0000000107310e33 UIApplicationMain + 1010
    24  Mytest                          0x00000001060b10a3 main + 115
    25  libdyld.dylib                       0x00000001089065fd start + 1
    26  ???                                 0x0000000000000001 0x0 + 1
)