STRatingControl is an open source Swift based user interface component for adding a star rating control to your iOS apps from Shukhrat Tursunov.
STRatingControl allows for easy customization which works within interface builder. You can change the image used as the stars, the spacing between stars, the current rating, and the max rating within interface builder.
This image from the readme showing STRatingControl within interface builder:
You can find STRatingControl on Github here .
A nice easy to implement and customize star rating control.