debugging AutoLayout exception with no build errors
debugging AutoLayout exception with no build errors
- Subject: debugging AutoLayout exception with no build errors
- From: 2551 <email@hidden>
- Date: Wed, 04 Nov 2015 22:19:24 +0700
I have an OSX app built on 10.11.1, deployment target 10.9. The app builds and runs without any AutoLayout issues or warnings from Xcode. I have ambiguities turned on.
The problem is when I try to run the app on 10.9. Although the app will run without fatally crashing, one of its main windows won’t open. In Console, on launch I first see the message
“Unable to create description in descriptionForLayoutAttribute_layoutItem_coefficient. Something is nil.”
If I then try to open the window from a menu command, I get the stacktrace (relevant part appended below). I see the ‘mutually exclusive’ error starting at line 18 in the trace, but I’ve manually been through the constraints and can’t see any conflicts. I’ve also removed all constraints and had Xcode do “Add Missing Constraints” after that. Again, no AutoLayout errors on build, but still the mutually exclusive exception occurs on 10.9.
Does anyone have any debugging tips as to how do I can find the source of the problem when neither Xcode nor Console on my build machine make any complaints?
Best
Phil
0 CoreFoundation 0x00007fff9497025c __exceptionPreprocess + 172
1 libobjc.A.dylib 0x00007fff92de3e75 objc_exception_throw + 43
2 CoreFoundation 0x00007fff9497010c +[NSException raise:format:] + 204
3 Foundation 0x00007fff8f98cc55 descriptionForLayoutAttribute_layoutItem_coefficient + 145
4 Foundation 0x00007fff8f98caaf -[NSLayoutConstraint equationDescription] + 215
5 Foundation 0x00007fff8f98cf3e -[NSLayoutConstraint description] + 298
6 CoreFoundation 0x00007fff949620e1 -[NSArray descriptionWithLocale:indent:] + 481
7 Foundation 0x00007fff8f7517bb _NSDescriptionWithLocaleFunc + 64
8 CoreFoundation 0x00007fff9485ece4 __CFStringAppendFormatCore + 7332
9 CoreFoundation 0x00007fff9488d263 _CFStringCreateWithFormatAndArgumentsAux + 115
10 CoreFoundation 0x00007fff948c4aeb _CFLogvEx + 123
11 Foundation 0x00007fff8f77b32c NSLogv + 79
12 Foundation 0x00007fff8f77b2b8 NSLog + 148
13 AppKit 0x00007fff8f1dc194 -[NSView(NSConstraintBasedLayout) engine:willBreakConstraint:dueToMutuallyExclusiveConstraints:] + 114
14 Foundation 0x00007fff8f98713e -[NSISEngine handleUnsatisfiableRowWithHead:body:usingInfeasibilityHandlingBehavior:mutuallyExclusiveConstraints:] + 507
15 Foundation 0x00007fff8f98789c -[NSISEngine tryUsingArtificialVariableToAddConstraintWithMarker:rowBody:usingInfeasibilityHandlingBehavior:mutuallyExclusiveConstraints:] + 379
16 Foundation 0x00007fff8f784e89 -[NSISEngine tryToAddConstraintWithMarker:expression:integralizationAdjustment:mutuallyExclusiveConstraints:] + 663
17 Foundation 0x00007fff8f98d897 -[NSLayoutConstraint _addLoweredExpression:toEngine:integralizationAdjustment:lastLoweredConstantWasRounded:mutuallyExclusiveConstraints:] + 285
18 Foundation 0x00007fff8f7792cf -[NSLayoutConstraint _addToEngine:integralizationAdjustment:mutuallyExclusiveConstraints:] + 204
19 AppKit 0x00007fff8e97520b __52-[NSView(NSConstraintBasedLayout) _setLayoutEngine:]_block_invoke_2 + 411
20 Foundation 0x00007fff8f7873aa -[NSISEngine withBehaviors:performModifications:] + 119
21 AppKit 0x00007fff8e8d795c -[NSView(NSConstraintBasedLayout) _withAutomaticEngineOptimizationDisabled:] + 66
22 AppKit 0x00007fff8e975049 __52-[NSView(NSConstraintBasedLayout) _setLayoutEngine:]_block_invoke + 433
23 AppKit 0x00007fff8e8da4fa -[NSView(NSConstraintBasedLayout) _setLayoutEngine:] + 229
24 AppKit 0x00007fff8e975122 __52-[NSView(NSConstraintBasedLayout) _setLayoutEngine:]_block_invoke_2 + 178
25 Foundation 0x00007fff8f7873aa -[NSISEngine withBehaviors:performModifications:] + 119
26 AppKit 0x00007fff8e8d795c -[NSView(NSConstraintBasedLayout) _withAutomaticEngineOptimizationDisabled:] + 66
27 AppKit 0x00007fff8e975049 __52-[NSView(NSConstraintBasedLayout) _setLayoutEngine:]_block_invoke + 433
28 AppKit 0x00007fff8e8da4fa -[NSView(NSConstraintBasedLayout) _setLayoutEngine:] + 229
29 AppKit 0x00007fff8e97ab9e make_and_host_engine + 256
30 AppKit 0x00007fff8e97a8e7 -[NSView(NSConstraintBasedLayout) _didChangeHostsAutolayoutEngineTo:] + 165
31 AppKit 0x00007fff8e91ccce -[NSView(NSConstraintBasedLayout) _engageAutolayout] + 81
32 AppKit 0x00007fff8e91cceb -[NSView(NSConstraintBasedLayout) _engageAutolayout] + 110
33 AppKit 0x00007fff8e8e240a -[NSView(NSConstraintBasedLayout) _layoutEngine_windowDidChange] + 87
34 AppKit 0x00007fff8f01c8ee __21-[NSView _setWindow:]_block_invoke643 + 67
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