I have a app which use a webview to show some HTML forms. In HTML forms there is added functionality to choose image from device. All functionality is from HTML form for capturing image. When i click on browse button of form from webview camera opens and everything is working fine but i get below log in xcode.
Snapshotting a view that has not been rendered results in an empty snapshot. Ensure your view has been rendered at least once before snapshotting or snapshot after screen updates.
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. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSLayoutConstraint:0x16fa21f0 UIView:0x180afaa0.height == 0.454545*CAMModeDial:0x16f06760.height - 4.09091>",
"<NSLayoutConstraint:0x18065020 CAMShutterButton:0x180bfbc0.centerY == CAMBottomBar:0x16f06100.centerY>",
"<NSLayoutConstraint:0x18065b70 V:[CAMShutterButton:0x180bfbc0]-(0)-[CAMModeDial:0x16f06760]>",
"<NSLayoutConstraint:0x18065ba0 CAMModeDial:0x16f06760.bottom == UIButton:0x180b5870'Cancel'.top>",
"<NSLayoutConstraint:0x180645f0 V:[UIButton:0x180b5870'Cancel']-(31)-| (Names: '|':CAMBottomBar:0x16f06100 )>",
"<NSLayoutConstraint:0x180b6870 'UIView-Encapsulated-Layout-Height' V:[PLImagePickerCameraView:0x170f2600(0)]>",
"<NSLayoutConstraint:0x180b8780 CAMBottomBar:0x16f06100.height == PLImagePickerCameraView:0x170f2600.height>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x16fa21f0 UIView:0x180afaa0.height == 0.454545*CAMModeDial:0x16f06760.height - 4.09091>
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.
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. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSLayoutConstraint:0x18065020 CAMShutterButton:0x180bfbc0.centerY == CAMBottomBar:0x16f06100.centerY>",
"<NSLayoutConstraint:0x18065b70 V:[CAMShutterButton:0x180bfbc0]-(0)-[CAMModeDial:0x16f06760]>",
"<NSLayoutConstraint:0x18065ba0 CAMModeDial:0x16f06760.bottom == UIButton:0x180b5870'Cancel'.top>",
"<NSLayoutConstraint:0x180645f0 V:[UIButton:0x180b5870'Cancel']-(31)-| (Names: '|':CAMBottomBar:0x16f06100 )>",
"<NSLayoutConstraint:0x180b6870 'UIView-Encapsulated-Layout-Height' V:[PLImagePickerCameraView:0x170f2600(0)]>",
"<NSLayoutConstraint:0x180b8780 CAMBottomBar:0x16f06100.height == PLImagePickerCameraView:0x170f2600.height>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x18065b70 V:[CAMShutterButton:0x180bfbc0]-(0)-[CAMModeDial:0x16f06760]>
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.
I am not able to solve it can somebody help me understand these errors and and suggest how to go about solving them?
Edit :- On searching net about CAMShutterButton,CAMModeDial,CAMBottomBar,PLImagePickerCameraView i found CAMShutterButton.h,CAMModeDial.h,CAMBottomBar.h are class files in CameraKit.framework and PLImagePickerCameraView.h is a class file in PhotoLibrary.framework. Which are part of iOS 8 private framework but i am not using any one of them in my application.
Change the priority of the constraint
"<NSLayoutConstraint:0x18065b70 V:[CAMShutterButton:0x180bfbc0]-(0)-[CAMModeDial:0x16f06760]>" from Required(1000) to High(750)
Related
Am getting below error and m,y custom annotation view is not displaying in my iPhone5s device but its displaying in my iPhone6+ device,
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.
(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you
don't understand, refer to the documentation for the UIView property
translatesAutoresizingMaskIntoConstraints) (
"NSAutoresizingMaskLayoutConstraint:0x12afb36b0 h=--& v=--& H:[MKSmallCalloutView:0x12c0021d0(0)]",
"NSLayoutConstraint:0x12aede9f0 H:|-(0)-[UIView:0x12c008f70] (Names: '|':MKSmallCalloutView:0x12c0021d0 )",
"NSLayoutConstraint:0x12aee0ca0 H:[UIView:0x12c008f70]-(0)-[_MKCalloutAccessoryWrapperView:0x12afc1090]",
"NSLayoutConstraint:0x12aedec30 H:[_MKCalloutAccessoryWrapperView:0x12afc1090]-(12)-[UILabel:0x12c003750'\U00a0']",
"NSLayoutConstraint:0x12aededc0 UIView:0x12c009180.trailing == MKSmallCalloutView:0x12c0021d0.trailing",
"NSLayoutConstraint:0x12aedeeb0 _MKCalloutAccessoryWrapperView:0x12afc6860.trailing == UIView:0x12c009180.leading",
"NSLayoutConstraint:0x12aedef00 UILabel:0x12c003750'\U00a0'.trailing <=
_MKCalloutAccessoryWrapperView:0x12afc6860.leading - 12>" )
Will attempt to recover by breaking constraint
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in may also be helpful.
2016-01-27 13:15:49.348 OK[2390:779352] Unable to simultaneously satisfy constraints.
Please help me to get out of this issue.
I had the same issue because the center of the Map was always considered the center of the self.view and not the center of the mapView. You need to set the center of your mapview.
I'm getting a bunch of auto layout constraints errors in my log, albeit there's none in my storyboard. I am having trouble understanding most of them especially locating specific views and text fields that are throwing errors:
2015-07-19 20:39:28.625 Daily[42447:417537] 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. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSLayoutConstraint:0x7fd8a3e309e0 'UIView-Encapsulated-Layout-Width' H:[UIView:0x7fd8a3dc4ea0(375)]>",
"<NSLayoutConstraint:0x7fd8a3dcc3f0 UIView:0x7fd8a3f416c0.leading == UIView:0x7fd8a3dc4ea0.leadingMargin>",
"<NSLayoutConstraint:0x7fd8a3dcc4e0 UIView:0x7fd8a3dc4ea0.centerX == UIView:0x7fd8a3f416c0.centerX>",
"<NSLayoutConstraint:0x7fd8a3dcc670 V:[UIView:0x7fd8a3f416c0(81)]>",
"<NSLayoutConstraint:0x7fd8a3dcc6c0 UIView:0x7fd8a3f416c0.width == 4.54321*UIView:0x7fd8a3f416c0.height>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x7fd8a3dcc6c0 UIView:0x7fd8a3f416c0.width == 4.54321*UIView:0x7fd8a3f416c0.height>
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.
2015-07-19 20:39:28.627 Daily[42447:417537] 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. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSLayoutConstraint:0x7fd8a3e309e0 'UIView-Encapsulated-Layout-Width' H:[UIView:0x7fd8a3dc4ea0(375)]>",
"<NSLayoutConstraint:0x7fd8a3dcbf20 V:[UIView:0x7fd8a3dc4a50]-(76)-[UIView:0x7fd8a3dcb8b0]>",
"<NSLayoutConstraint:0x7fd8a3dcbfc0 V:[_UILayoutGuide:0x7fd8a3dc4fb0]-(322)-[UIView:0x7fd8a3dcb8b0]>",
"<NSLayoutConstraint:0x7fd8a3dcc010 UIView:0x7fd8a3dc4ea0.width == 3.25203*UIView:0x7fd8a3dc4a50.height>",
"<NSLayoutConstraint:0x7fd8a3dcc100 V:[UIView:0x7fd8a3dcc150]-(34)-[UIView:0x7fd8a3dc4a50]>",
"<NSLayoutConstraint:0x7fd8a3dcc5d0 V:[_UILayoutGuide:0x7fd8a3dc4fb0]-(31)-[UIView:0x7fd8a3dcc150]>",
"<NSLayoutConstraint:0x7fd8a3dcdec0 H:[UIView:0x7fd8a3dcc150(368)]>",
"<NSLayoutConstraint:0x7fd8a3dcdf10 UIView:0x7fd8a3dcc150.width == 6.34483*UIView:0x7fd8a3dcc150.height>"
)
Will attempt to recover by breaking constraint
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.
2015-07-19 20:39:28.628 Daily[42447:417537] 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. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSLayoutConstraint:0x7fd8a3e309e0 'UIView-Encapsulated-Layout-Width' H:[UIView:0x7fd8a3dc4ea0(375)]>",
"<NSLayoutConstraint:0x7fd8a3dcbed0 UIView:0x7fd8a3dcb8b0.trailing == UIView:0x7fd8a3dc4ea0.trailingMargin>",
"<NSLayoutConstraint:0x7fd8a3dcbf70 UIView:0x7fd8a3dcb8b0.leading == UIView:0x7fd8a3dc4ea0.leadingMargin>",
"<NSLayoutConstraint:0x7fd8a3dccf80 H:[UIView:0x7fd8a3dcb8b0(368)]>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x7fd8a3dccf80 H:[UIView:0x7fd8a3dcb8b0(368)]>
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.
2015-07-19 20:39:28.644 Daily[42447:417537] 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. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSLayoutConstraint:0x7fd8a3e309e0 'UIView-Encapsulated-Layout-Width' H:[UIView:0x7fd8a3dc4ea0(375)]>",
"<NSLayoutConstraint:0x7fd8a3dcc3f0 UIView:0x7fd8a3f416c0.leading == UIView:0x7fd8a3dc4ea0.leadingMargin>",
"<NSLayoutConstraint:0x7fd8a3dcc4e0 UIView:0x7fd8a3dc4ea0.centerX == UIView:0x7fd8a3f416c0.centerX>",
"<NSLayoutConstraint:0x7fd8a3dcc620 H:[UIView:0x7fd8a3f416c0(368)]>"
)
Will attempt to recover by breaking constraint
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.
You are adding wrong constraints to the views. If you adding centerX constraint then their is no need to add leading space constraint, it will conflict the constraint. Add the constraint as centerX, height, width, & give Y position as you want.
Your approach is appreciable. But, mostly I'd like to develop an app by disabling Auto-layout and classes. You need to set resize margins in the interface builder. If you're not clear with my solution, Please let me know, I'll explain it clearly :) :)
I am attemptin to animate one of my container view's constraints. In IB, the the view is constrained fine without errors or warnings. When I call these methods in viewDidLoad, to change the views y coordinate like so:
self.queueContainerYConst.constant += 550;
[self.view layoutIfNeeded];
I get the message for "unable to satisfy constraints...". While running the app, my animations and UI look fine, everything is appears to be constrained properly. Here is the entire message I get in the console.
2015-05-03 14:17:52.668 Streamacy[15914:3333195] 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. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSLayoutConstraint:0x155a95c0 V:|-(614)-[UIView:0x155a83a0] (Names: '|':UIView:0x155a91b0 )>",
"<NSLayoutConstraint:0x155a95f0 V:[UIView:0x155a83a0]-(0)-| (Names: '|':UIView:0x155a91b0 )>",
"<NSLayoutConstraint:0x155af080 'UIView-Encapsulated-Layout-Height' V:[UIView:0x155a91b0(568)]>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x155a95f0 V:[UIView:0x155a83a0]-(0)-| (Names: '|':UIView:0x155a91b0 )>
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.
2015-05-03 14:17:52.684 Streamacy[15914:3333195] 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. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSLayoutConstraint:0x1566a2a0 UIView:0x156a1900.width == UIView:0x156a1900.height>",
"<NSLayoutConstraint:0x156a9000 V:[UIView:0x156a1900]-(32)-[UIProgressView:0x15688f30]>",
"<NSLayoutConstraint:0x156a0df0 V:[UIProgressView:0x15688f30]-(11)-[MarqueeLabel:0x156a7360'Awake']>",
"<NSLayoutConstraint:0x156a0eb0 UIView:0x1569dd90.trailingMargin == UIView:0x156a1900.trailing + 99>",
"<NSLayoutConstraint:0x156a0f10 UIView:0x156a1900.leading == UIView:0x1569dd90.leadingMargin + 99>",
"<NSLayoutConstraint:0x156a0f40 UIView:0x156a1900.top == UIView:0x1569dd90.topMargin - 46>",
"<NSLayoutConstraint:0x156a92f0 V:[UILabel:0x156a6ea0'Tycho']-(17)-[UITableView:0x1587a000]>",
"<NSLayoutConstraint:0x156a93b0 V:[MarqueeLabel:0x156a7360'Awake']-(2)-[UILabel:0x156a6ea0'Tycho']>",
"<NSLayoutConstraint:0x156a94d0 V:[UITableView:0x1587a000]-(0)-[_UILayoutGuide:0x156a8b20]>",
"<_UILayoutSupportConstraint:0x156a4cf0 V:[_UILayoutGuide:0x156a8b20(0)]>",
"<_UILayoutSupportConstraint:0x156a4810 _UILayoutGuide:0x156a8b20.bottom == UIView:0x1569dd90.bottom>",
"<NSLayoutConstraint:0x156b6070 'UIView-Encapsulated-Layout-Width' H:[UIView:0x1569dd90(320)]>",
"<NSLayoutConstraint:0x156b60a0 'UIView-Encapsulated-Layout-Height' V:[UIView:0x1569dd90(0)]>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x1566a2a0 UIView:0x156a1900.width == UIView:0x156a1900.height>
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.
2015-05-03 14:17:52.688 Streamacy[15914:3333195] 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. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSLayoutConstraint:0x156a9000 V:[UIView:0x156a1900]-(32)-[UIProgressView:0x15688f30]>",
"<NSLayoutConstraint:0x156a0df0 V:[UIProgressView:0x15688f30]-(11)-[MarqueeLabel:0x156a7360'Awake']>",
"<NSLayoutConstraint:0x156a0f40 UIView:0x156a1900.top == UIView:0x1569dd90.topMargin - 46>",
"<NSLayoutConstraint:0x156a92f0 V:[UILabel:0x156a6ea0'Tycho']-(17)-[UITableView:0x1587a000]>",
"<NSLayoutConstraint:0x156a93b0 V:[MarqueeLabel:0x156a7360'Awake']-(2)-[UILabel:0x156a6ea0'Tycho']>",
"<NSLayoutConstraint:0x156a94d0 V:[UITableView:0x1587a000]-(0)-[_UILayoutGuide:0x156a8b20]>",
"<_UILayoutSupportConstraint:0x156a4cf0 V:[_UILayoutGuide:0x156a8b20(0)]>",
"<_UILayoutSupportConstraint:0x156a4810 _UILayoutGuide:0x156a8b20.bottom == UIView:0x1569dd90.bottom>",
"<NSLayoutConstraint:0x156b60a0 'UIView-Encapsulated-Layout-Height' V:[UIView:0x1569dd90(0)]>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x156a9000 V:[UIView:0x156a1900]-(32)-[UIProgressView:0x15688f30]>
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.
It appears that everything inside my container view gets misplaced, why?. Am I animating/changing my view improperly?
You're view is over constrained. You have a constraint of 614 to the top and 0 to the bottom of its superview, but the height of that view is 568, so those numbers don't add up. It would be better to only have one of those vertical constraints and a fixed hight for your view if that works for your purposes (that "fixed" height could be made relative to the superview's height if you ned it to adjust for different screen sizes).
I am having the following error in my console.I don't know what are they.
2015-03-24 13:57:43.213 automobile[5454:530574] 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. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSLayoutConstraint:0x174284880 V:[_UILayoutGuide:0x1741b8e20]-(238)-[UIButton:0x12ee424c0'Retry']>",
"<NSLayoutConstraint:0x174284740 V:[UIButton:0x12ee424c0'Retry']-(236)-[_UILayoutGuide:0x1741b8f00]>",
"<_UILayoutSupportConstraint:0x1740aeb80 V:[_UILayoutGuide:0x1741b8e20(50.66)]>",
"<_UILayoutSupportConstraint:0x1740aebe0 V:|-(0)-[_UILayoutGuide:0x1741b8e20] (Names: '|':UIView:0x174185bd0 )>",
"<_UILayoutSupportConstraint:0x1740aee80 V:[_UILayoutGuide:0x1741b8f00(0)]>",
"<_UILayoutSupportConstraint:0x1740aee20 _UILayoutGuide:0x1741b8f00.bottom == UIView:0x174185bd0.bottom>",
"<NSLayoutConstraint:0x174289d30 'UIView-Encapsulated-Layout-Height' V:[UIView:0x174185bd0(375)]>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x174284880 V:[_UILayoutGuide:0x1741b8e20]-(238)-[UIButton:0x12ee424c0'Retry']>
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.
Anyone who know this?Any Help?
It seems you have conflicting constraints on your views.
If you are using Interface Builder, I suggest your click on the Red or Yellow arrows in your VC scene and Xcode should give you more details as to what constraints are causing the issue.
You can see here http://i.stack.imgur.com/5lbp8.png and here http://i.stack.imgur.com/qjvFL.png how this should appear in Xcode.
I suggest you start by reconsidering the constraints and try to keep the minimum that satisfy your layout.
I hope this helps
Layout error appeared while trying to get the landscape orientation. And layout becomes broken.
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.
(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand,
refer to the documentation for the UIView property
translatesAutoresizingMaskIntoConstraints)
(
"<NSLayoutConstraint:0x78fc49c0 H:[UILayoutContainerView:0x78e536e0(320)]>",
"<NSLayoutConstraint:0x799cf0e0 'UIView-Encapsulated-Layout-Width' H:[UILayoutContainerView:0x78e536e0(568)]>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x799cf0e0 'UIView-Encapsulated-Layout-Width' H:[UILayoutContainerView:0x78e536e0(568)]>
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.
And there is the similar error for vertical constraints.
I did not create those constraints. There are no UITabBar objects. I do not know which other objects create such constraints.