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App crash when back quote with wireless keyboard #898

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ThomasAtome opened this issue Sep 12, 2017 · 0 comments
Open

App crash when back quote with wireless keyboard #898

ThomasAtome opened this issue Sep 12, 2017 · 0 comments
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@dmitrys

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@ThomasAtome
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ThomasAtome commented Sep 12, 2017 •
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Hi,

My app crash when I write a back quote or a ^ char in a textarea with a wireless keyboard. If I do the same with the native keyboard the app doesn't crash.

It only crash on iOS 10.3, not on 11 beta or 9.

I add some logs when I press the back quote button.

Sep 12 12:10:00 iPad rhorunner(UIKit)[1108] <Error>: Unable to simultaneously satisfy constraints.
	Probably at least one of the constraints in the following list is one you don't want. 
	Try this: 
		(1) look at each constraint and try to figure out which you don't expect; 
		(2) find the code that added the unwanted constraint or constraints and fix it. 
(
    "<NSLayoutConstraint:0x17009cc00 _UIButtonBarStackView:0x12fa099d0.width <= 178   (active)>",
    "<NSLayoutConstraint:0x17028db60 _UIUCBKBSelectionBackground:0x12fa42c60.width >= 34   (active)>",
    "<NSLayoutConstraint:0x17028d9d0 H:|-(0)-[_UIUCBKBSelectionBackground:0x12fa42c60]   (active, names: '|':_UIButtonBarButton:0x12fa425c0 )>",
    "<NSLayoutConstraint:0x17028da70 _UIUCBKBSelectionBackground:0x12fa42c60.trailing == _UIButtonBarButton:0x12fa425c0.trailing   (active)>",
    "<NSLayoutConstraint:0x170287760 _UIUCBKBSelectionBackground:0x12fa49fe0.width >= 34   (active)>",
    "<NSLayoutConstraint:0x1702878f0 H:|-(0)-[_UIUCBKBSelectionBackground:0x12fa49fe0]   (active, names: '|':_UIButtonBarButton:0x12fa39790 )>",
    "<NSLayoutConstraint:0x170287850 _UIUCBKBSelectionBackground:0x12fa49fe0.trailing == _UIButtonBarButton:0x12fa39790.trailing   (active)>",
    "<NSLayoutConstraint:0x170287cb0 _UIUCBKBSelectionBackground:0x12fa4d000.width >= 34   (active)>",
    "<NSLayoutConstraint:0x170287e40 H:|-(0)-[_UIUCBKBSelectionBackground:0x12fa4d000]   (active, names: '|':_UIButtonBarButton:0x12fa4a330 )>",
    "<NSLayoutConstraint:0x170287da0 _UIUCBKBSelectionBackground:0x12fa4d000.trailing == _UIButtonBarButton:0x12fa4a330.trailing   (active)>",
    "<NSLayoutConstraint:0x1702904f0 _UIUCBKBSelectionBackground:0x12fa55b50.width >= 34   (active)>",
    "<NSLayoutConstraint:0x170290360 H:|-(0)-[_UIUCBKBSelectionBackground:0x12fa55b50]   (active, names: '|':_UIButtonBarButton:0x12fa554b0 )>",
    "<NSLayoutConstraint:0x170290400 _UIUCBKBSelectionBackground:0x12fa55b50.trailing == _UIButtonBarButton:0x12fa554b0.trailing   (active)>",
    "<NSLayoutConstraint:0x170290c20 _UIUCBKBSelectionBackground:0x12fa56740.width >= 34   (active)>",
    "<NSLayoutConstraint:0x170290a90 H:|-(0)-[_UIUCBKBSelectionBackground:0x12fa56740]   (active, names: '|':_UIButtonBarButton:0x12fa55ea0 )>",
    "<NSLayoutConstraint:0x170290b30 _UIUCBKBSelectionBackground:0x12fa56740.trailing == _UIButtonBarButton:0x12fa55ea0.trailing   (active)>",
    "<NSLayoutConstraint:0x170291350 _UIUCBKBSelectionBackground:0x12fa57130.width >= 34   (active)>",
    "<NSLayoutConstraint:0x1702911c0 H:|-(0)-[_UIUCBKBSelectionBackground:0x12fa57130]   (active, names: '|':_UIButtonBarButton:0x12fa56a90 )>",
    "<NSLayoutConstraint:0x170291260 _UIUCBKBSelectionBackground:0x12fa57130.trailing == _UIButtonBarButton:0x12fa56a90.trailing   (active)>",
    "<NSLayoutConstraint:0x174283250 'UISV-canvas-connection' UILayoutGuide:0x170193180'UIViewLayoutMarginsGuide'.trailing == _UIButtonBarButton:0x12fa425c0.trailing   (active)>",
    "<NSLayoutConstraint:0x170288110 'UISV-canvas-connection' UILayoutGuide:0x170193180'UIViewLayoutMarginsGuide'.leading == _UIButtonBarButton:0x12fa554b0.leading   (active)>",
    "<NSLayoutConstraint:0x1742832a0 'UISV-spacing' H:[UIImageView:0x12fa0a250]-(0)-[UIView:0x12fa42420]   (active)>",
    "<NSLayoutConstraint:0x1742832f0 'UISV-spacing' H:[UIView:0x12fa42420]-(0)-[_UIButtonBarButton:0x12fa425c0]   (active)>",
    "<NSLayoutConstraint:0x17028e010 'UISV-spacing' H:[_UIButtonBarButton:0x12fa39790]-(0)-[UIView:0x12fa4a190]   (active)>",
    "<NSLayoutConstraint:0x170288700 'UISV-spacing' H:[UIView:0x12fa4a190]-(0)-[_UIButtonBarButton:0x12fa4a330]   (active)>",
    "<NSLayoutConstraint:0x1740912b0 'UISV-spacing' H:[_UIButtonBarButton:0x12fa554b0]-(0)-[UIView:0x12fa55d00]   (active)>",
    "<NSLayoutConstraint:0x17409c4d0 'UISV-spacing' H:[UIView:0x12fa55d00]-(0)-[_UIButtonBarButton:0x12fa55ea0]   (active)>",
    "<NSLayoutConstraint:0x174284920 'UISV-spacing' H:[_UIButtonBarButton:0x12fa55ea0]-(0)-[UIView:0x12fa568f0]   (active)>",
    "<NSLayoutConstraint:0x17409f1d0 'UISV-spacing' H:[UIView:0x12fa568f0]-(0)-[_UIButtonBarButton:0x12fa56a90]   (active)>",
    "<NSLayoutConstraint:0x174285870 'UISV-spacing' H:[_UIButtonBarButton:0x12fa56a90]-(0)-[UIView:0x12fa572e0]   (active)>",
    "<NSLayoutConstraint:0x174285640 'UISV-spacing' H:[UIView:0x12fa572e0]-(0)-[_UIButtonBarButton:0x12fa39790]   (active)>",
    "<NSLayoutConstraint:0x174283840 'UISV-spacing' H:[_UIButtonBarButton:0x12fa4a330]-(0)-[UIView:0x12fa575d0]   (active)>",
    "<NSLayoutConstraint:0x174285230 'UISV-spacing' H:[UIView:0x12fa575d0]-(0)-[UIImageView:0x12fa0a250]   (active)>",
    "<NSLayoutConstraint:0x17009c520 'UIView-leftMargin-guide-constraint' H:|-(15)-[UILayoutGuide:0x170193180'UIViewLayoutMarginsGuide'](LTR)   (active, names: '|':_UIButtonBarStackView:0x12fa099d0 )>",
    "<NSLayoutConstraint:0x17009c5c0 'UIView-rightMargin-guide-constraint' H:[UILayoutGuide:0x170193180'UIViewLayoutMarginsGuide']-(15)-|(LTR)   (active, names: '|':_UIButtonBarStackView:0x12fa099d0 )>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x170291350 _UIUCBKBSelectionBackground:0x12fa57130.width >= 34   (active)>

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
Sep 12 12:10:00 iPad rhorunner(UIKit)[1108] <Error>: Unable to simultaneously satisfy constraints.
	Probably at least one of the constraints in the following list is one you don't want. 
	Try this: 
		(1) look at each constraint and try to figure out which you don't expect; 
		(2) find the code that added the unwanted constraint or constraints and fix it. 
(
    "<NSLayoutConstraint:0x17009cc00 _UIButtonBarStackView:0x12fa099d0.width <= 178   (active)>",
    "<NSLayoutConstraint:0x17028db60 _UIUCBKBSelectionBackground:0x12fa42c60.width >= 34   (active)>",
    "<NSLayoutConstraint:0x17028d9d0 H:|-(0)-[_UIUCBKBSelectionBackground:0x12fa42c60]   (active, names: '|':_UIButtonBarButton:0x12fa425c0 )>",
    "<NSLayoutConstraint:0x17028da70 _UIUCBKBSelectionBackground:0x12fa42c60.trailing == _UIButtonBarButton:0x12fa425c0.trailing   (active)>",
    "<NSLayoutConstraint:0x170287760 _UIUCBKBSelectionBackground:0x12fa49fe0.width >= 34   (active)>",
    "<NSLayoutConstraint:0x1702878f0 H:|-(0)-[_UIUCBKBSelectionBackground:0x12fa49fe0]   (active, names: '|':_UIButtonBarButton:0x12fa39790 )>",
    "<NSLayoutConstraint:0x170287850 _UIUCBKBSelectionBackground:0x12fa49fe0.trailing == _UIButtonBarButton:0x12fa39790.trailing   (active)>",
    "<NSLayoutConstraint:0x170287cb0 _UIUCBKBSelectionBackground:0x12fa4d000.width >= 34   (active)>",
    "<NSLayoutConstraint:0x170287e40 H:|-(0)-[_UIUCBKBSelectionBackground:0x12fa4d000]   (active, names: '|':_UIButtonBarButton:0x12fa4a330 )>",
    "<NSLayoutConstraint:0x170287da0 _UIUCBKBSelectionBackground:0x12fa4d000.trailing == _UIButtonBarButton:0x12fa4a330.trailing   (active)>",
    "<NSLayoutConstraint:0x1702904f0 _UIUCBKBSelectionBackground:0x12fa55b50.width >= 34   (active)>",
    "<NSLayoutConstraint:0x170290360 H:|-(0)-[_UIUCBKBSelectionBackground:0x12fa55b50]   (active, names: '|':_UIButtonBarButton:0x12fa554b0 )>",
    "<NSLayoutConstraint:0x170290400 _UIUCBKBSelectionBackground:0x12fa55b50.trailing == _UIButtonBarButton:0x12fa554b0.trailing   (active)>",
    "<NSLayoutConstraint:0x170290c20 _UIUCBKBSelectionBackground:0x12fa56740.width >= 34   (active)>",
    "<NSLayoutConstraint:0x170290a90 H:|-(0)-[_UIUCBKBSelectionBackground:0x12fa56740]   (active, names: '|':_UIButtonBarButton:0x12fa55ea0 )>",
    "<NSLayoutConstraint:0x170290b30 _UIUCBKBSelectionBackground:0x12fa56740.trailing == _UIButtonBarButton:0x12fa55ea0.trailing   (active)>",
    "<NSLayoutConstraint:0x170290fe0 H:|-(6)-[UIButton:0x12fa56c70]   (active, names: '|':_UIButtonBarButton:0x12fa56a90 )>",
    "<NSLayoutConstraint:0x170291030 UIButton:0x12fa56c70.trailing == _UIButtonBarButton:0x12fa56a90.trailing - 6   (active)>",
    "<NSLayoutConstraint:0x174283250 'UISV-canvas-connection' UILayoutGuide:0x170193180'UIViewLayoutMarginsGuide'.trailing == _UIButtonBarButton:0x12fa425c0.trailing   (active)>",
    "<NSLayoutConstraint:0x170288110 'UISV-canvas-connection' UILayoutGuide:0x170193180'UIViewLayoutMarginsGuide'.leading == _UIButtonBarButton:0x12fa554b0.leading   (active)>",
    "<NSLayoutConstraint:0x1742832a0 'UISV-spacing' H:[UIImageView:0x12fa0a250]-(0)-[UIView:0x12fa42420]   (active)>",
    "<NSLayoutConstraint:0x1742832f0 'UISV-spacing' H:[UIView:0x12fa42420]-(0)-[_UIButtonBarButton:0x12fa425c0]   (active)>",
    "<NSLayoutConstraint:0x17028e010 'UISV-spacing' H:[_UIButtonBarButton:0x12fa39790]-(0)-[UIView:0x12fa4a190]   (active)>",
    "<NSLayoutConstraint:0x170288700 'UISV-spacing' H:[UIView:0x12fa4a190]-(0)-[_UIButtonBarButton:0x12fa4a330]   (active)>",
    "<NSLayoutConstraint:0x1740912b0 'UISV-spacing' H:[_UIButtonBarButton:0x12fa554b0]-(0)-[UIView:0x12fa55d00]   (active)>",
    "<NSLayoutConstraint:0x17409c4d0 'UISV-spacing' H:[UIView:0x12fa55d00]-(0)-[_UIButtonBarButton:0x12fa55ea0]   (active)>",
    "<NSLayoutConstraint:0x174284920 'UISV-spacing' H:[_UIButtonBarButton:0x12fa55ea0]-(0)-[UIView:0x12fa568f0]   (active)>",
    "<NSLayoutConstraint:0x17409f1d0 'UISV-spacing' H:[UIView:0x12fa568f0]-(0)-[_UIButtonBarButton:0x12fa56a90]   (active)>",
    "<NSLayoutConstraint:0x174285870 'UISV-spacing' H:[_UIButtonBarButton:0x12fa56a90]-(0)-[UIView:0x12fa572e0]   (active)>",
    "<NSLayoutConstraint:0x174285640 'UISV-spacing' H:[UIView:0x12fa572e0]-(0)-[_UIButtonBarButton:0x12fa39790]   (active)>",
    "<NSLayoutConstraint:0x174283840 'UISV-spacing' H:[_UIButtonBarButton:0x12fa4a330]-(0)-[UIView:0x12fa575d0]   (active)>",
    "<NSLayoutConstraint:0x174285230 'UISV-spacing' H:[UIView:0x12fa575d0]-(0)-[UIImageView:0x12fa0a250]   (active)>",
    "<NSLayoutConstraint:0x17009c520 'UIView-leftMargin-guide-constraint' H:|-(15)-[UILayoutGuide:0x170193180'UIViewLayoutMarginsGuide'](LTR)   (active, names: '|':_UIButtonBarStackView:0x12fa099d0 )>",
    "<NSLayoutConstraint:0x17009c5c0 'UIView-rightMargin-guide-constraint' H:[UILayoutGuide:0x170193180'UIViewLayoutMarginsGuide']-(15)-|(LTR)   (active, names: '|':_UIButtonBarStackView:0x12fa099d0 )>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x170290c20 _UIUCBKBSelectionBackground:0x12fa56740.width >= 34   (active)>

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
Sep 12 12:10:00 iPad rhorunner(UIKit)[1108] <Error>: Unable to simultaneously satisfy constraints.
	Probably at least one of the constraints in the following list is one you don't want. 
	Try this: 
		(1) look at each constraint and try to figure out which you don't expect; 
		(2) find the code that added the unwanted constraint or constraints and fix it. 
(
    "<NSLayoutConstraint:0x17009cc00 _UIButtonBarStackView:0x12fa099d0.width <= 178   (active)>",
    "<NSLayoutConstraint:0x17028db60 _UIUCBKBSelectionBackground:0x12fa42c60.width >= 34   (active)>",
    "<NSLayoutConstraint:0x17028d9d0 H:|-(0)-[_UIUCBKBSelectionBackground:0x12fa42c60]   (active, names: '|':_UIButtonBarButton:0x12fa425c0 )>",
    "<NSLayoutConstraint:0x17028da70 _UIUCBKBSelectionBackground:0x12fa42c60.trailing == _UIButtonBarButton:0x12fa425c0.trailing   (active)>",
    "<NSLayoutConstraint:0x170287760 _UIUCBKBSelectionBackground:0x12fa49fe0.width >= 34   (active)>",
    "<NSLayoutConstraint:0x1702878f0 H:|-(0)-[_UIUCBKBSelectionBackground:0x12fa49fe0]   (active, names: '|':_UIButtonBarButton:0x12fa39790 )>",
    "<NSLayoutConstraint:0x170287850 _UIUCBKBSelectionBackground:0x12fa49fe0.trailing == _UIButtonBarButton:0x12fa39790.trailing   (active)>",
    "<NSLayoutConstraint:0x170287cb0 _UIUCBKBSelectionBackground:0x12fa4d000.width >= 34   (active)>",
    "<NSLayoutConstraint:0x170287e40 H:|-(0)-[_UIUCBKBSelectionBackground:0x12fa4d000]   (active, names: '|':_UIButtonBarButton:0x12fa4a330 )>",
    "<NSLayoutConstraint:0x170287da0 _UIUCBKBSelectionBackground:0x12fa4d000.trailing == _UIButtonBarButton:0x12fa4a330.trailing   (active)>",
    "<NSLayoutConstraint:0x1702904f0 _UIUCBKBSelectionBackground:0x12fa55b50.width >= 34   (active)>",
    "<NSLayoutConstraint:0x170290360 H:|-(0)-[_UIUCBKBSelectionBackground:0x12fa55b50]   (active, names: '|':_UIButtonBarButton:0x12fa554b0 )>",
    "<NSLayoutConstraint:0x170290400 _UIUCBKBSelectionBackground:0x12fa55b50.trailing == _UIButtonBarButton:0x12fa554b0.trailing   (active)>",
    "<NSLayoutConstraint:0x1702908b0 H:|-(6)-[UIButton:0x12fa56280]   (active, names: '|':_UIButtonBarButton:0x12fa55ea0 )>",
    "<NSLayoutConstraint:0x170290900 UIButton:0x12fa56280.trailing == _UIButtonBarButton:0x12fa55ea0.trailing - 6   (active)>",
    "<NSLayoutConstraint:0x170290fe0 H:|-(6)-[UIButton:0x12fa56c70]   (active, names: '|':_UIButtonBarButton:0x12fa56a90 )>",
    "<NSLayoutConstraint:0x170291030 UIButton:0x12fa56c70.trailing == _UIButtonBarButton:0x12fa56a90.trailing - 6   (active)>",
    "<NSLayoutConstraint:0x174283250 'UISV-canvas-connection' UILayoutGuide:0x170193180'UIViewLayoutMarginsGuide'.trailing == _UIButtonBarButton:0x12fa425c0.trailing   (active)>",
    "<NSLayoutConstraint:0x170288110 'UISV-canvas-connection' UILayoutGuide:0x170193180'UIViewLayoutMarginsGuide'.leading == _UIButtonBarButton:0x12fa554b0.leading   (active)>",
    "<NSLayoutConstraint:0x1742832a0 'UISV-spacing' H:[UIImageView:0x12fa0a250]-(0)-[UIView:0x12fa42420]   (active)>",
    "<NSLayoutConstraint:0x1742832f0 'UISV-spacing' H:[UIView:0x12fa42420]-(0)-[_UIButtonBarButton:0x12fa425c0]   (active)>",
    "<NSLayoutConstraint:0x17028e010 'UISV-spacing' H:[_UIButtonBarButton:0x12fa39790]-(0)-[UIView:0x12fa4a190]   (active)>",
    "<NSLayoutConstraint:0x170288700 'UISV-spacing' H:[UIView:0x12fa4a190]-(0)-[_UIButtonBarButton:0x12fa4a330]   (active)>",
    "<NSLayoutConstraint:0x1740912b0 'UISV-spacing' H:[_UIButtonBarButton:0x12fa554b0]-(0)-[UIView:0x12fa55d00]   (active)>",
    "<NSLayoutConstraint:0x17409c4d0 'UISV-spacing' H:[UIView:0x12fa55d00]-(0)-[_UIButtonBarButton:0x12fa55ea0]   (active)>",
    "<NSLayoutConstraint:0x174284920 'UISV-spacing' H:[_UIButtonBarButton:0x12fa55ea0]-(0)-[UIView:0x12fa568f0]   (active)>",
    "<NSLayoutConstraint:0x17409f1d0 'UISV-spacing' H:[UIView:0x12fa568f0]-(0)-[_UIButtonBarButton:0x12fa56a90]   (active)>",
    "<NSLayoutConstraint:0x174285870 'UISV-spacing' H:[_UIButtonBarButton:0x12fa56a90]-(0)-[UIView:0x12fa572e0]   (active)>",
    "<NSLayoutConstraint:0x174285640 'UISV-spacing' H:[UIView:0x12fa572e0]-(0)-[_UIButtonBarButton:0x12fa39790]   (active)>",
    "<NSLayoutConstraint:0x174283840 'UISV-spacing' H:[_UIButtonBarButton:0x12fa4a330]-(0)-[UIView:0x12fa575d0]   (active)>",
    "<NSLayoutConstraint:0x174285230 'UISV-spacing' H:[UIView:0x12fa575d0]-(0)-[UIImageView:0x12fa0a250]   (active)>",
    "<NSLayoutConstraint:0x17009c520 'UIView-leftMargin-guide-constraint' H:|-(15)-[UILayoutGuide:0x170193180'UIViewLayoutMarginsGuide'](LTR)   (active, names: '|':_UIButtonBarStackView:0x12fa099d0 )>",
    "<NSLayoutConstraint:0x17009c5c0 'UIView-rightMargin-guide-constraint' H:[UILayoutGuide:0x170193180'UIViewLayoutMarginsGuide']-(15)-|(LTR)   (active, names: '|':_UIButtonBarStackView:0x12fa099d0 )>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x1702904f0 _UIUCBKBSelectionBackground:0x12fa55b50.width >= 34   (active)>

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
Sep 12 12:10:00 iPad rhorunner[1108] <Notice>: I 09/12/2017 12:10:00:161 6e89f000            EVE DEBUG| Ruby Stats - travel duration = 14ms, processing = 0ms
Sep 12 12:10:00 iPad rhorunner[1108] <Notice>: I 09/12/2017 12:10:00:163 6e89f000            EVE DEBUG| Wait for messages
Sep 12 12:10:00 iPad rhorunner(UIKit)[1108] <Error>: Unable to simultaneously satisfy constraints.
	Probably at least one of the constraints in the following list is one you don't want. 
	Try this: 
		(1) look at each constraint and try to figure out which you don't expect; 
		(2) find the code that added the unwanted constraint or constraints and fix it. 
(
    "<NSLayoutConstraint:0x17009cbb0 _UIButtonBarStackView:0x12ddf1c60.width <= 0   (active)>",
    "<NSLayoutConstraint:0x17009bee0 'UIView-leftMargin-guide-constraint' H:|-(15)-[UILayoutGuide:0x170192b00'UIViewLayoutMarginsGuide'](LTR)   (active, names: '|':_UIButtonBarStackView:0x12ddf1c60 )>",
    "<NSLayoutConstraint:0x17009bf80 'UIView-rightMargin-guide-constraint' H:[UILayoutGuide:0x170192b00'UIViewLayoutMarginsGuide']-(15)-|(LTR)   (active, names: '|':_UIButtonBarStackView:0x12ddf1c60 )>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x17009bf80 'UIView-rightMargin-guide-constraint' H:[UILayoutGuide:0x170192b00'UIViewLayoutMarginsGuide']-(15)-|(LTR)   (active, names: '|':_UIButtonBarStackView:0x12ddf1c60 )>

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
Sep 12 12:10:00 iPad rhorunner[1108] <Notice>: I 09/12/2017 12:10:00:167 6e28b000            EVE DEBUG| Compute state duration for 1 objects : 0ms
Sep 12 12:10:00 iPad rhorunner(UIKit)[1108] <Error>: Unable to simultaneously satisfy constraints.
	Probably at least one of the constraints in the following list is one you don't want. 
	Try this: 
		(1) look at each constraint and try to figure out which you don't expect; 
		(2) find the code that added the unwanted constraint or constraints and fix it. 
(
    "<NSLayoutConstraint:0x17009cc00 _UIButtonBarStackView:0x12fa099d0.width <= 0   (active)>",
    "<NSLayoutConstraint:0x17009c520 'UIView-leftMargin-guide-constraint' H:|-(15)-[UILayoutGuide:0x170193180'UIViewLayoutMarginsGuide'](LTR)   (active, names: '|':_UIButtonBarStackView:0x12fa099d0 )>",
    "<NSLayoutConstraint:0x17009c5c0 'UIView-rightMargin-guide-constraint' H:[UILayoutGuide:0x170193180'UIViewLayoutMarginsGuide']-(15)-|(LTR)   (active, names: '|':_UIButtonBarStackView:0x12fa099d0 )>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x17009c5c0 'UIView-rightMargin-guide-constraint' H:[UILayoutGuide:0x170193180'UIViewLayoutMarginsGuide']-(15)-|(LTR)   (active, names: '|':_UIButtonBarStackView:0x12fa099d0 )>

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
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