Auto Layout in Xcode 6 - Pinning view to edge of parent view creates -8 constraint

Question

In Xcode 6 when I try to pin an image view to the edge of UICollectionViewCell, auto-layout creates constraints of -8.0. What changed? I've tried to find release notes or documentation updates but haven't seen anything.

Notice the imageview is up against the edges of the collectionview cell

Frame X and Y are both zero

frame

Adding constraints for leading space and trailing space to container margin results in a settings of -8.0

constraints

Why is this happening and what is the preferred approach for edge to edge content?

Change the "Show" pop-up in your middle screenshot to "Layout Rectangle". Are the X and Y still 0? — Ken Thomases, Sep 11 '14 at 01:05

score 8 · Accepted Answer · answered Sep 11 '14 at 02:10

8

Before you add a new constraint, you will need to untick the "Constain to Margins". It is ticked by default.

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answered Sep 11 '14 at 02:10

Ricky

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Why he has to do that? whats the propose of this tick ? – Curnelious Sep 17 '14 at 12:26
in iOS 8, there is one new property call "layout margins" for all the views inherit from UIView. See: http://stackoverflow.com/questions/25770119/ios-8-uitableview-separator-inset-0-not-working/25788003#25788003 – Ricky Sep 18 '14 at 12:30

Auto Layout in Xcode 6 - Pinning view to edge of parent view creates -8 constraint

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