objective c - Strange NSLayoutConstraint Behavior -


i have uiscrollview add uitextview to. have following constraint adding view:

nslayoutconstraint *xconstraint = [nslayoutconstraint constraintwithitem:textview2 attribute:nslayoutattributeleading relatedby:nslayoutrelationequal toitem:_scrollview attribute:nslayoutattributeleading multiplier:1.0 constant:50];

this constraint works changing leading trailing so, has no effect. still displays based on leading. 

nslayoutconstraint *xconstraint = [nslayoutconstraint constraintwithitem:textview2 attribute:nslayoutattributeleading relatedby:nslayoutrelationequal toitem:_scrollview attribute:nslayoutattributetrailing multiplier:1.0 constant:50];

i have no understanding why uitextview's location doesn't change position when change constraint leading trailing. realize need change 50 -50 if constraining trailing edge, isn't.

the solution turned out to insert uiview inside of uiscrollview. did in storyboard, , set top , bottom constraints uiview uiscrollview, set leading , trailing constraints uiview parent view contains uiscrollview in turn contains uiview. allows leading , trailing constraints function correctly.


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