The game is a copy of one of the oldest games ever made (Tennis for Two). This game has not achieved commercial success, better known is game called Pong, it was made in 1972 by Atari and it has achieved great success.
This game was made by me for education reasons. i made this in swift 4.x. Hope you have fun! you can see whole project on my github: https://github.com/KarolBorecki/Pong.