What is a 'UIView-Encapsulated-Layout-Width' constraint?

I keep getting ‘Unable to simultaneously satisfy constraints’ exceptions (Xcode 5, iOS 7, both device and simulator), where one of the constraints in the list is something like this:

"<NSLayoutConstraint:0x165b23d0 'UIView-Encapsulated-Layout-Width'

I did not set this constraint myself. It’s also not an NSAutoresizingMaskLayoutConstraint.
But where does it come from? And how can I get rid of it?

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  • I have no idea.
    And I can’t find anything about 'UIView-Encapsulated-Layout-Width' in the Apple’s documentation.
    Even the Google search returns nothing at all.

    Any suggestions?

    PS: I’m using this cell in a UICollectionView with a custom subclass of UICollectionViewFlowLayout. Maybe the 'Encapsulated-Layout' part has something to do with this?

    4 Solutions Collect From Internet About “What is a 'UIView-Encapsulated-Layout-Width' constraint?”

    A quick and nice fix, is to assign 999 priority value to the custom constraints with high priority. The encapsulated & auto-generated constraints should dominate with higher priority than your constraints.


    i played with the sample, i think these codes is causing the Autolayout exception.

    CGFloat height = MAX(0, -y + maxY); line 79 in CSStickyHeaderFlowLayout.m.

    if you use a static value for the height like 200, the exception won’t happen anymore. i can’t understand what exactly is UIView-Encapsulated-Layout, but seems like dynamically changing the UICollectionViewLayoutAttributes frame may cause that problem. in the sample project, it’s the height, in PO’s problem, i guess it’s the width. Maybe i can dig a little bit more into it, if you think that would be helpful

    I can shed some light on the answer to the question. In my OS X app, I found such a mysterious constraint on the cell view of an NSTableView, (that is, an object which I had previously returned in the NSTableViewDelegate method -tableView:viewForTableColumn:row). I had also sent a setWidth:0.0 message to this same table column. Changing the parameter in that setWidth: from 0.0 to something else was reflected in the constant value of the mysterious constraint.

    Conclusion: Constraints which log themselves with ‘UIView-Encapsulated-Layout-Width’ or ‘NSView-Encapsulated-Layout-Width’ are caused by setting the width of a table column, or something similar.

    I found this with iOS 10 builds where I was using UITableViewCell subclasses as normal views not as table rows. The cell was constraining its contentView to zero width.

    The workaround I used was to just add the contentView to the view hierarchy instead of the tableview cell. I also made sure to retain the tableView cell (as it was no longer being retained by the view hierarchy itself).