ios - Class implementing UITableViewDataSource is always null -

i have tableview should have delegate , datasource properties set insertintotableviewdelegate , insertintotableviewdatasource classes respectively. however, insertintotableviewdatasource class returns null.

here code:

class insertintotableviewdatasource: nsobject,uitableviewdatasource {      var data:nsmutablearray      init(with data: nsmutablearray){         self.data = data     }       func tableview(tableview: uitableview, numberofrowsinsection section: int) -> int {         return data.count     }      func tableview(tableview: uitableview, cellforrowatindexpath indexpath: nsindexpath) -> uitableviewcell {         let cell = tableview.dequeuereusablecellwithidentifier("rowcell", forindexpath: indexpath)         cell.textlabel?.text = data[indexpath.row] as? string         return cell     } } 

here how tableview being set:

override func viewdidload() {     super.viewdidload()     self.title = "testing"     tableview.datasource = insertintotableviewdatasource(with: data)     tableview.delegate = insertintotableviewdelegate() } 

why case?

uitableview not retain datasource, datasource getting deallocated viewdidload function ends.

you need hold reference datasource property in view controller. same thing delegate.