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SOLVED: Console warning output for Project 4 (BetterRest)

Forums > 100 Days of SwiftUI
@DashingDave  

Curious to know if anyone else has encountered/understands this warning (the app still runs fine): when running the final product (and I've run Paul's code from the GitHub repository), the console produces the following message:

2022-01-16 18:01:05.816275-0500 BetterRest[10866:253030] [LayoutConstraints] 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:0x600002750ff0 UIView:0x7fa6d205e080.trailing == _UIBackButtonMaskView:0x7fa6d20496b0.trailing (active)>", "<NSLayoutConstraint:0x6000027523a0 'Mask_Trailing_Trailing' _UIBackButtonMaskView:0x7fa6d20496b0.trailing == BackButton.trailing (active, names: BackButton:0x7fa6d2086e20 )>", "<NSLayoutConstraint:0x600002752210 'MaskEV_Leading_BIB_Trailing' H:[_UIModernBarButton:0x7fa6d202ce50]-(0)-[UIView:0x7fa6d205e080] (active)>", "<NSLayoutConstraint:0x6000027566c0 'UINav_static_button_horiz_position' _UIModernBarButton:0x7fa6d202ce50.leading == UILayoutGuide:0x600003d69c00'UIViewLayoutMarginsGuide'.leading (active)>", "<NSLayoutConstraint:0x600002756300 'UINavItemContentGuide-leading' H:[BackButton]-(6)-[UILayoutGuide:0x600003d69b20'UINavigationBarItemContentLayoutGuide'] (active, names: BackButton:0x7fa6d2086e20 )>", "<NSLayoutConstraint:0x600002753d40 'UINavItemContentGuide-trailing' UILayoutGuide:0x600003d69b20'UINavigationBarItemContentLayoutGuide'.trailing == _UINavigationBarContentView:0x7fa6d2050700.trailing (active)>", "<NSLayoutConstraint:0x60000274cfa0 'UIView-Encapsulated-Layout-Width' _UINavigationBarContentView:0x7fa6d2050700.width == 0 (active)>", "<NSLayoutConstraint:0x600002753980 'UIView-leftMargin-guide-constraint' H:|-(8)-UILayoutGuide:0x600003d69c00'UIViewLayoutMarginsGuide' (active, names: '|':_UINavigationBarContentView:0x7fa6d2050700 )>" )

Will attempt to recover by breaking constraint <NSLayoutConstraint:0x600002750ff0 UIView:0x7fa6d205e080.trailing == _UIBackButtonMaskView:0x7fa6d20496b0.trailing (active)>

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger. The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKitCore/UIView.h> may also be helpful. 2022-01-16 18:01:05.817469-0500 BetterRest[10866:253030] [LayoutConstraints] 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:0x600002751b30 'BIB_Leading_Leading' H:|-(0)-[_UIModernBarButton:0x7fa6d202ce50] (active, names: BackButton:0x7fa6d2086e20, '|':BackButton:0x7fa6d2086e20 )>", "<NSLayoutConstraint:0x6000027566c0 'UINav_static_button_horiz_position' _UIModernBarButton:0x7fa6d202ce50.leading == UILayoutGuide:0x600003d69c00'UIViewLayoutMarginsGuide'.leading (active)>", "<NSLayoutConstraint:0x600002756300 'UINavItemContentGuide-leading' H:[BackButton]-(6)-[UILayoutGuide:0x600003d69b20'UINavigationBarItemContentLayoutGuide'] (active, names: BackButton:0x7fa6d2086e20 )>", "<NSLayoutConstraint:0x600002753d40 'UINavItemContentGuide-trailing' UILayoutGuide:0x600003d69b20'UINavigationBarItemContentLayoutGuide'.trailing == _UINavigationBarContentView:0x7fa6d2050700.trailing (active)>", "<NSLayoutConstraint:0x60000274cfa0 'UIView-Encapsulated-Layout-Width' _UINavigationBarContentView:0x7fa6d2050700.width == 0 (active)>", "<NSLayoutConstraint:0x600002753980 'UIView-leftMargin-guide-constraint' H:|-(8)-UILayoutGuide:0x600003d69c00'UIViewLayoutMarginsGuide' (active, names: '|':_UINavigationBarContentView:0x7fa6d2050700 )>" )

Will attempt to recover by breaking constraint <NSLayoutConstraint:0x600002751b30 'BIB_Leading_Leading' H:|-(0)-[_UIModernBarButton:0x7fa6d202ce50] (active, names: BackButton:0x7fa6d2086e20, '|':BackButton:0x7fa6d2086e20 )>

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger. The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKitCore/UIView.h> may also be helpful. 2022-01-16 18:01:05.818098-0500 BetterRest[10866:253030] [LayoutConstraints] 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:0x600002751b80 'BIB_Trailing_CB_Leading' H:[_UIModernBarButton:0x7fa6d202ce50]-(6)-[_UIModernBarButton:0x7fa6d2013070'BetterRest'] (active)>", "<NSLayoutConstraint:0x600002751bd0 'CB_Trailing_Trailing' _UIModernBarButton:0x7fa6d2013070'BetterRest'.trailing <= BackButton.trailing (active, names: BackButton:0x7fa6d2086e20 )>", "<NSLayoutConstraint:0x6000027566c0 'UINav_static_button_horiz_position' _UIModernBarButton:0x7fa6d202ce50.leading == UILayoutGuide:0x600003d69c00'UIViewLayoutMarginsGuide'.leading (active)>", "<NSLayoutConstraint:0x600002756300 'UINavItemContentGuide-leading' H:[BackButton]-(6)-[UILayoutGuide:0x600003d69b20'UINavigationBarItemContentLayoutGuide'] (active, names: BackButton:0x7fa6d2086e20 )>", "<NSLayoutConstraint:0x600002753d40 'UINavItemContentGuide-trailing' UILayoutGuide:0x600003d69b20'UINavigationBarItemContentLayoutGuide'.trailing == _UINavigationBarContentView:0x7fa6d2050700.trailing (active)>", "<NSLayoutConstraint:0x60000274cfa0 'UIView-Encapsulated-Layout-Width' _UINavigationBarContentView:0x7fa6d2050700.width == 0 (active)>", "<NSLayoutConstraint:0x600002753980 'UIView-leftMargin-guide-constraint' H:|-(8)-UILayoutGuide:0x600003d69c00'UIViewLayoutMarginsGuide' (active, names: '|':_UINavigationBarContentView:0x7fa6d2050700 )>" )

Will attempt to recover by breaking constraint <NSLayoutConstraint:0x600002751b80 'BIB_Trailing_CB_Leading' H:[_UIModernBarButton:0x7fa6d202ce50]-(6)-[_UIModernBarButton:0x7fa6d2013070'BetterRest'] (active)>

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger. The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKitCore/UIView.h> may also be helpful. 2022-01-16 18:01:06.057186-0500 BetterRest[10866:253030] [Warning] Warning once only: Detected a case where constraints ambiguously suggest a height of zero for a table view cell's content view. We're considering the collapse unintentional and using standard height instead. Cell: <SwiftUI.ListTableViewCell: 0x7fa6d30b1400; baseClass = UITableViewCell; frame = (0 66.6667; 350 64.3333); autoresize = W; layer = <CALayer: 0x600000404ea0>>

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