How to use dequeueReusableCellWithIdentifier in Swift?

Question

If I uncomment

tableView(tableView: UITableView?, cellForRowAtIndexPath indexPath: NSIndexPath?) 

I get an error on the line

let cell = tableView.dequeueReusableCellWithIdentifier("reuseIdentifier", forIndexPath: indexPath) 

that says UITableView? does not have a member named 'dequeueReusableCellWithIdentifier'

If I unwrap the tableview then the error goes away, but in Objective-C we would normally check whether or not the cell exists, and if it does not we create a new one. In Swift, since the boilerplate provided uses the let keyword and unwraps an optional, we can't reassign it if it's nil.

What's the proper way to use dequeueReusableCellWithIdentifier in Swift?

Answer 1

You can implicitly unwrap the parameters to the method and also cast the result of dequeueReusableCellWithIdentifier to give the following succinct code:

func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell {     let cell = tableView.dequeueReusableCellWithIdentifier("CellIdentifier", forIndexPath: indexPath) as UITableViewCell      //configure your cell      return cell } 

Answer 2

If the cell type hasn't been registered with the table view before the table loads, you can use the following to fetch a cell instance:

private let cellReuseIdentifier: String = "yourCellReuseIdentifier"  // MARK: UITableViewDataSource  func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {   var cell:UITableViewCell? = tableView.dequeueReusableCellWithIdentifier(cellReuseIdentifier)   if (cell == nil) {     cell = UITableViewCell(style:UITableViewCellStyle.Subtitle, reuseIdentifier:cellReuseIdentifier)   }   cell!.textLabel!.text = "Hello World"   return cell! }