ios - Autolayout Contraints Changes in CollectionViewCell -


i using purelayout create constraints

in cellforitematindexpath

if (!_itemdetails){             _itemdetails = cell.itemdetails;             _itemdetailsconstraint = [_itemdetails autopinedge:aledgebottom toedge:aledgebottom ofview:cell.imageview];         }

and in scrolldidview

float scrollviewheight = self.collectionview.frame.size.height;     float scrolloffset = self.collectionview.contentoffset.y;      if(_itemdetails){          if (scrolloffset + scrollviewheight < cgrectgetmaxy(_frontimageview.frame)){              _itemdetailsconstraint.constant =  cgrectgetmaxy(_frontimageview.frame) - (scrolloffset + scrollviewheight);          }         else{             _itemdetailsconstraint.constant = 0;         }     }      [_itemdetails.superview layoutifneeded];

eventhough while debugging, can see constraint's constant changed, view doesn't update new location.

i tried

[self.view layoutifneeded]

and

[self.collectionview layoutifneeded]

how can update view's (_itemdetails, point view in collectionviewcell) location?

[collectionview reloaddata];

if contraints create or update in collection:cellforitematindexpath:,you can reload cell.


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