SpriteKit is my favorite framework. It is helpful in making games, and I am currently using it for a long-term project called SkyNation.
This is a set of UIElements that I have been building for use with SpriteKit. There are classes here to build Game Buttons, Sliders, Tables, Side Pickers, Scene controllers, etc. It is very useful for game making. You should check it out on my GitHub repository.
I always wanted to make a space game in which the player gets to build a space station, explore space and planets, etc. I look forward to sharing it with you when it is completed.