ios - What is the right way (Best practice) for dequeue a reusable cell in swift 3? -

i'm want dequeue cell use in table view i'm afraid i'm doing in wrong way.

currently i'm doing way:

func tableview(_ tableview: uitableview, cellforrowat indexpath: indexpath) -> uitableviewcell {     guard let cell = tableview.dequeuereusablecell(withidentifier: "cellid", for: indexpath) as? customcell else {         return uitableviewcell()     }      //configure atributes here.                  return cell } 

what i'm want know if right or have check if cell nil?

var cell = tableview.dequeuereusablecell(withidentifier: "cellid", for: indexpath) customcell  if cell == nil {     cell = customcell() } 

what code correct? if none of them right witch way right way?

just forced unwrap cell:

let cell = tableview.dequeuereusablecell(withidentifier: "cellid", for: indexpath) as! customcell ... return cell 

since you have designed cell in interface builder crash reveal design error.