CODEWITHSUNDEEP
iosswiftdebuggingautolayoutconstraints
Vandan Patel
Vandan Patel

Reputation: 1022

How to debug AutoLayout Constraints?

I am new to iOS Development. Whenever I run my App, I get this conflicting constraints error. Can you please suggest me something about how to debug this issue?

2016-07-13 12:53:51.186 Calculator[4458:50017] 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. 
(
    "<_UILayoutSupportConstraint:0x7fcaf3c5e670 V:[_UILayoutGuide:0x7fcaf3c62a80(0)]>",
    "<_UILayoutSupportConstraint:0x7fcaf3c5c060 _UILayoutGuide:0x7fcaf3c62a80.bottom == UIView:0x7fcaf3c54390.bottom>",
    "<NSLayoutConstraint:0x7fcaf3c54b00 UIImageView:0x7fcaf3c54c70.width == UIImageView:0x7fcaf3c54c70.height>",
    "<NSLayoutConstraint:0x7fcaf3c633d0 V:|-(0)-[UIImageView:0x7fcaf3c54c70]   (Names: '|':UIView:0x7fcaf3c54390 )>",
    "<NSLayoutConstraint:0x7fcaf3c63420 H:[UIImageView:0x7fcaf3c54c70]-(0)-|   (Names: '|':UIView:0x7fcaf3c54390 )>",
    "<NSLayoutConstraint:0x7fcaf3c63470 H:|-(0)-[UIImageView:0x7fcaf3c54c70]   (Names: '|':UIView:0x7fcaf3c54390 )>",
    "<NSLayoutConstraint:0x7fcaf3c63560 V:[UIImageView:0x7fcaf3c54c70]-(0)-[_UILayoutGuide:0x7fcaf3c62a80]>",
    "<NSLayoutConstraint:0x7fcaf3c67e50 'UIView-Encapsulated-Layout-Height' V:[UIView:0x7fcaf3c54390(736)]>",
    "<NSLayoutConstraint:0x7fcaf3c61230 'UIView-Encapsulated-Layout-Width' H:[UIView:0x7fcaf3c54390(414)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x7fcaf3c54b00 UIImageView:0x7fcaf3c54c70.width == UIImageView:0x7fcaf3c54c70.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.

Upvotes: 0

Views: 2947

Answers (1)

Konsy
Konsy

Reputation: 306

It seems as if you have a constraint added which is being counter acted by another constraint.

Normally if you right click you're able to get the 'Suggested Constraints' try using them and see if it works!

edit: enter image description here

Upvotes: 1

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