You don't need to do this anymore with storyboards. All you need to do is copy and paste the content of the cell nib into a new cell in a table view with dynamic prototypes.
- Drag a new Table View Cell into a Table View. Make sure to set your Table View to dynamic prototypes.
- Set the cell's identifier and load that the same as you would programmatically.
- Copy and paste the content from your nib into the new cell.