ios - addSubview on cellForItemAtIndexPath issue in Swift -

i have collectionview custom cells. trying add dynamic labels in each cell, added last cell shown. if make scroll, labels disappear of cell , appear in new cell shown. number , text of labels achieved web service. cellforitematindexpath function:

override func collectionview(collectionview: uicollectionview, cellforitematindexpath indexpath: nsindexpath) -> uicollectionviewcell {         let cell = collectionview.dequeuereusablecellwithreuseidentifier(reuseidentifier, forindexpath: indexpath) as! undatedcell         cell.titlelabel.text = "sacar al perro"         cell.locationlabel.text = "casa"          var aux: cgfloat = 0          label in labelsarray {             let labelwidht = calculatelabelwidht(label) + 20             cell.labelsview.addsubview(label)             label.leftanchor.constraintequaltoanchor(cell.labelsview.leftanchor, constant: aux).active = true             label.centeryanchor.constraintequaltoanchor(cell.labelsview.centeryanchor).active = true             label.widthanchor.constraintequaltoconstant(labelwidht).active = true              aux = aux + labelwidht + 8         }          return cell     } 

in viewdidload create demo labels:

override func viewdidload() {         super.viewdidload()          self.collectionview!.registerclass(undatedcell.self, forcellwithreuseidentifier: reuseidentifier)          self.collectionview?.alwaysbouncevertical = true          let label1 = labellabel()         label1.text = "zara"         labelsarray.append(label1)         let label2 = labellabel()         label2.text = "perro"         labelsarray.append(label2)         let label3 = labellabel()         label3.text = "amigo"         labelsarray.append(label3)     } 

finally, pic of result:

collectionviewphoto

thank time!