ios - Swift - edit contraints on the last cell from UICollection View -


i edit contraint last cell uicollectionview. in cell have image contraints on center of cell want align left of cell.

i trying it:

let cell : mycellcollection = collectionview.dequeuereusablecellwithreuseidentifier("mycellcollection", forindexpath: indexpath) as! mycellcollection  var oldrole : nslayoutconstraint = nslayoutconstraint(item: cell.imageview1, attribute: nslayoutattribute.centerx, relatedby: nslayoutrelation.equal, toitem: cell, attribute: nslayoutattribute.centerx, multiplier: 1, constant: 0) var newrole : nslayoutconstraint = nslayoutconstraint(item: cell.imageview1,  attribute: nslayoutattribute.leading, relatedby: nslayoutrelation.equal, toitem: cell, attribute: nslayoutattribute.leading, multiplier: 1, constant: 8);  cell.imageview1.removeconstraint(oldrole) cell.imageview1.addconstraint(newrole)

when run got error:

terminating app due uncaught exception 'nsgenericexception', reason: 'unable install constraint on view. constraint reference outside subtree of view? that's illegal.

as see, need create custom cell class, have constraint iboutlet property nib file. can remove , add new leading space constraint.


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