ios - How to Set UITableViewCellStyleSubtitle and dequeueReusableCell in Swift?

Question

I'd like a UITableView with subtitle-style cells that use dequeueReusableCellWithIdentifier.

My original Objective-C code was:

static NSString *reuseIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:reuseIdentifier];
if(!cell)
{
    cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:reuseIdentifier];
}

After searching the few UITableView questions here already on SO, I thought to write it in Swift like so:

tableView.registerClass(UITableViewCell.classForCoder(), forCellReuseIdentifier: "Cell")

let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as UITableViewCell

But that doesn't let me say I want a subtitle style. So I tried this:

var cell :UITableViewCell = UITableViewCell(style: UITableViewCellStyle.Subtitle, reuseIdentifier: "Cell")

Which gives me a subtitle cell, but it doesn't let me dequeueReusableCellWithIdentifier.

I've researched some more and looked at this video tutorial, but he creates a separate subclass of UITableViewCell which I assume is unnecessary as I accomplished this same effect previously in Obj-C.

Any ideas? Thanks.

Answer 1

Keep in mind that UITableView is defined as an optional in the function, which means your initial cell declaration needs to check for the optional in the property. Also, the returned queued cell is also optional, so ensure you make an optional cast to UITableViewCell. Afterwards, we can force unwrap because we know we have a cell.

var cell:UITableViewCell? = 
tableView?.dequeueReusableCellWithIdentifier(reuseIdentifier) as? UITableViewCell
if (cell == nil)
{
   cell = UITableViewCell(style: UITableViewCellStyle.Subtitle, 
                reuseIdentifier: reuseIdentifier)
}
// At this point, we definitely have a cell -- either dequeued or newly created,
// so let's force unwrap the optional into a UITableViewCell
cell!.detailTextLabel.text = "some text"

return cell