Dequeue multiple cells conforming to same protocol

I have a table view with 2 different cells. Both cells conform to same protocol "WorkoutCellProtocol" and I want to avoid rewriting same code during dequeuing. Probably there will more cells in the future, but each will conform to same protocol.

First cell is WorkoutCell with identifier: "WorkoutTableViewCell"
Second cell is CardioCell with identifier: "CardioTableViewCell"

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

        var cell: WorkoutCellProtocols!
        cell.delegate = self
        cell.editableRowBorders = colorEditable
        cell.numberOfCell = indexPath.row
        cell.numberOfExercise = indexPath.section
        cell.configureTextFields(model: 
        exercises[indexPath.row])
        
        if data[indexPath.row].category == "Cardio" {
            
            cell = tableView.dequeueReusableCell(withIdentifier: "CardioTableViewCell", for: indexPath) as! CardioTableViewCell
            return cell as! CardioTableViewCell
            
        } else {
            cell = tableView.dequeueReusableCell(withIdentifier: "WorkoutTableViewCell") as! WorkoutTableViewCell
            return cell as! WorkoutTableViewCell
        }
    }

When I try to do this in this way, so assign properties only once at the top, before assigning a class types I get "Unexpectedly found nil while implicitly unwrapping an Optional value".

>Solution :

Dequeue your cell first, then configure it:

var cell: WorkoutCellProtocols

if data[indexPath.row].category == "Cardio" {
    cell = tableView.dequeueReusableCell(withIdentifier: "CardioTableViewCell", for: indexPath) as! WorkoutCellProtocols
} else {
    cell = tableView.dequeueReusableCell(withIdentifier: "WorkoutTableViewCell") as! WorkoutCellProtocols
}

cell.delegate = self
cell.editableRowBorders = colorEditable
cell.numberOfCell = indexPath.row
cell.numberOfExercise = indexPath.section
cell.configureTextFields(model: exercises[indexPath.row])
return cell

I’m assuming that your protocol is declared like this:

protocol WorkoutCellProtocols: UITableViewCell {
    ...
}