ios - TableView rows re-ordering unexpectedly -

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i having problem uitableview not preserving row order when row's come on screen.

after scrolling down/up order messed up. row index 1 in row 5's position , on. how keep row positions constant? 

internal func tableview( tableview: uitableview, cellforrowatindexpath indexpath: nsindexpath ) -> uitableviewcell {     var cell:uitableviewcell? = tableview.dequeuereusablecellwithidentifier( "cell" ) as? uitableviewcell      if cell == nil {         cell = uitableviewcell(style: uitableviewcellstyle.subtitle, reuseidentifier: "cell" )          // set cell's label         cell?.textlabel?.text = "cell: \(indexpath.row)"     }      // return cell     return cell! }

what doing wrong?

you setting text when creating cell (when dequeuereusablecellwithidentifier returns nil). should set/change text each time create or reuse cell:

internal func tableview( tableview: uitableview, cellforrowatindexpath indexpath: nsindexpath ) -> uitableviewcell {     var cell:uitableviewcell? = tableview.dequeuereusablecellwithidentifier( "cell" ) as? uitableviewcell      if cell == nil {         cell = uitableviewcell(style: uitableviewcellstyle.subtitle, reuseidentifier: "cell" )     }      // set cell's label     cell?.textlabel?.text = "cell: \(indexpath.row)"      // return cell     return cell! }

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