ios - accessoryButtonTappedForRowWithIndexPath not called on Detail accessory touch -

i have uitableview uitableviewcellaccessorytype.detaildisclosurebutton cannot call accessorybuttontappedforrowwithindexpath when detail icon tapped. parent view inherits uitableviewdelegate , uitableviewdatasource , linked delegate , datasource of table in ib. here cellforrowatindexpath

func tableview(tableview: uitableview, cellforrowatindexpath indexpath: nsindexpath) -> uitableviewcell {      let cell:uitableviewcell = self.resultsview.dequeuereusablecellwithidentifier("cell")! uitableviewcell     if self.tableitems.count == 0 {         cell.textlabel?.text = "no results found."     } else {         //cell.accessoryview =         cell.accessorytype = uitableviewcellaccessorytype.detaildisclosurebutton         cell.textlabel?.text = self.tableitems[indexpath.row]     }      return cell } 

and accessorybuttontappedforrowwithindexpath

func tableview(tableview: uitableview, accessorybuttontappedforrowwithindexpath indexpath: nsindexpath) {             let alert = uialertview()     alert.title = "failure"     alert.message = "yup"     alert.addbuttonwithtitle("accessorybuttontappedforrowwithindexpath called")     alert.show()      self.performseguewithidentifier("locationdetailsegue", sender : self) } 

the table displays (i) icon fine, when click it, nothing gets fired. have view set segue push to, doesn't seem calling method don't alert box.

i believe works specified, since apple documentation says:

disclosureindicator

the cell has accessory control shaped chevron. control indicates tapping cell triggers push action. the control not track touches.