Generic function does not update the value of label in tableview cell after tableView.reloadData()

Question

I have a function where I am incrementing the value of the label as below

@IBAction func buttonClicked(_ sender: UIButton) {
        let indexPath = indexPath(sender: sender, tableView: profileTableView)

        array[Int((indexPath.row))].likes = String(Int(array[Int((indexPath.row))].likes)!+1)
        self.userProfileTableView.reloadData()
    } 

In the above function after the reloadData value of the label gets incremented to the next number, But when I make it a generic function in an extension as below the value of the label does not increment

func buttonClicked(data:String,tableView:UITableView) {
        let data = String(Int(data)!+1)
        print("Incremented data", data)
        tableView.reloadData()
    }

I am calling the function as following but the label does not get updated with the incremented value . It retains the old value.

buttonClicked(data: feeds[Int((indexPath.row))].likes, tableView: userProfileTableView)

Any help will be appreciated . Thank you.

Answer 1

you should change your code to this.

let numLikes = Int(feeds[Int((indexPath.row))].likes)!
feeds[Int((indexPath.row)).likes = String(numLikes)

Because String is a value types.

When you do this.

buttonClicked(data: feeds[Int((indexPath.row))].likes, tableView: userProfileTableView)

func buttonClicked(data:String,tableView:UITableView) {
    let data = String(Int(data)!+1)
    print("Incremented data", data)
    tableView.reloadData()
}

1) New value variables data in func buttonClicked will be created and has value = feeds[Int((indexPath.row))].likes

2) when you change data, it just change data but not feeds[Int((indexPath.row))].likes

Look at Value and Reference Type for more info.