Prevent player from falling through the ground - Sprite Kit?

I've been trying to work on a simple Sprite Kit game that involves dodging red balls. I'm using the built-in gravity...

Sprite Kit - Draw circle with muilticolored borders?

I want to draw a circle similar to this: I'm going to have different objects interact (collide) with the circle ...

Swift - Must call a designated initializer of the superclass SKSpriteNode error?

This code worked on first XCode 6 Beta, but on latest Beta it's not working and gives such errors Must call a design...

iOS firework explosion using Sprite Kit particles?

I'm implementing app for kids activities and I want to add celebration animation such a fireworks: any of you kno...