swift - How to animate background of a Sprite-Kit game just like the login screen of Instagram iOS app?

Question

I am creating a game in Sprite-Kit and would want to animate the background in the similar fashion as Instagram does on its login screen.

Basically, I just want to know how to have a background in my game just like the Instagram app has on its login screen, i.e the pink colored screen which gradually changes to violet color and then to red with a very subtle flowing effect from right to left. I know how to animate the gradient but that subtle effect that I'm talking about which gives quite a view of a gas or stream flowing (I'm in love with that effect) doesn't seem to be happening.

Answer 1

You could use a framework such as BackgroundVideoiOS as seen on github