When I added the Cocoa Touch Class file, it defined the class for me. Here is its declaration: class EmojiTableViewCell: UITableViewController {} I did select "Cell" in interface Builder as you suggested, but nothing shows up in the drop-down. I did try the Option Clean Build, but nothing happened. Further - I've tried restarting the computer, and setting up a completely new project from scratch. Neither fixed the issue.

That did it - thanks, OOper!

I did, Claude, thanks, but I missed the salient point in your post just as I missed it when creating the Cocoa Touch Class file in the first place.

I had the same problem. (Swift 5.x, Xcode 12.5.1) I selected the Date Picker, then changed the "Preferred Style" in the Attributes Inspector from "Automatic" to "Wheels." That fixed it for me.