ios - Auto Layout Constraint from UICollectionViewCell to View from ViewController -

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i have uicollectionview can scroll horizontally. cell add constraint main view viewcontroller.

because cell of uicollectionview , not subview, xcode report error hierarchy wrong. how that?

edit :

the purpose or effect want :

i have uicollectionview scrolling horizontal. cells of collection view screen pages. on screens labels. when user scroll through pages in collection view label scroll left/right edge of screen stay there , disappear page. group table view section header horizontally.

enter image description here

thanks answers, nothing works me. did create 2 constraints: 

cell.left equal label.left : priority 499 cell.right greateorequal label.right

i save left constraint on scroll move did:

- (void) scrolloffsetchange: (cgpoint) offset {     int x = abs(((int)offset.x%(int)self.frame.size.width));     self.toplableleftconstraint.constant = x;     self.toplabels.alpha = 1 - (x/self.frame.size.width)*(x/self.frame.size.width);     [self layoutifneeded]; }

and ended disappear effect.


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