ios - How do I get rid of the -16 when doing horizontal layout to the edge of the superview in Xcode 6? -

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when try layout view edge of super view in xcode 6 storyboards constraint generated has constant of -16. why this, , how can make 0?

the -16 because constraint set against superview.trailing/leading margin not edge of superview. can fix selecting constraint , in info in top right select drop down superview item , toggle relative margin off.enter image description here


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